Fubuki double-checked the note in her hand, scrawled in familiar handwriting:
Make sure your place is clean tonight. You can make one of your lackeys do it for you. I’ll be there at nine.
She crossed the threshold of the living room to be met by her sister, who sat cross-legged on the couch facing her. Her expression was severe, impatient. “You’re late,” she said, folding her arms across her chest. Her thin dress hugged the plane of her stomach, see-through to the point that Fubuki could see the concave dip that showed off her navel. Pushing down other thoughts on that train, Fubuki came to a stop in the middle of the living room. Tatsumaki looked up..
“You’re late,” Tatsumaki said bluntly.
“I believe I’m right on time, sister,” Fubuki said evenly, stealing a quick glance at the clock on the wall, which read five minutes to nine. Normally, she’d shoo out anyone who imposed on her own house, much less anyone who had the gall to say she was anything less than punctual. But she knew better than to spark the temper in her older sister, so she filed away the momentary irritation.
Fubuki passed up the open spot on the couch to sit down on the nearby recliner, facing the couch at an angle. As she passed, she felt her sister’s eyes on her, piercing, hungry even. She sat down, folded her hands on her lap, and waited.
Tatsumaki didn’t visit very often. Her movements were slight, but Fubuki picked up on the thin sheen of sweat on Tatsumaki’s forehead, as well as her clenched jaw. What was the reason for her visit? Fubuki shifted in her seat. Her stomach felt odd, like it was permanently uncomfortable. Like no amount of moving would make it settle. She wasn’t sick, her stomach wasn’t upset, simply… unsettled.
“I’ll get straight to the point, Fubuki,” Tatsumaki said, staring her down, breaking her out of her thoughts. “You’re not doing good enough.”
Fubuki’s hands clenched in her lap, but her expression betrayed nothing beyond a slight tilt of her head. Her stomach swayed restlessly. Tatsumaki’s eyes went down to it, following it for a couple moments before looking back up. Fubuki didn’t seem to notice.
Tatsumaki narrowed her eyes. “Do you enjoy parading around your faithful followers? Snuffing out those minor threats?” She pressed a fist into her open palm, grinding them together. Her tone was patronizing, and Fubuki’s face reddened in shame. It had been a while since her sister’s last rant about inadequacy. Fubuki had thought that she’d finally been making some headway in that regard, but now the reason for Tatsumaki’s visit was clear. Fubuki’s stomach responded in kind to these emotions, jiggling some more. Her stomach was large, thick enough to go along with the rest of her curves.
She was used to living in the shadow of her sister, but she still had the urge to defend herself. “I gave them a home,” she said. “They may not be the strongest, but together, we’re more than capable.”
Tatsumaki was unimpressed. “Tell me when you face a real challenge,” she shrugged. “We’ll see how far your ‘teamwork’ carries you.” She sat forward on the couch, exposing her lower parts. Fubuki knew what was underneath, and her eyes watched each minute movement.
“If you came here just to tell me that, I think we’re done for today.” Fubuki stood up, but a force snagged her wrist, causing her to fall ungracefully back into her chair. A green halo surrounded her hand.
Tatsumaki lowered her finger and forcefield vanished. “Not quite. I’m a kind sister, you see,” she said, a glint flashing in her emerald eyes. Fubuki swallowed hard, unused to seeing even a flash of excitement out of her sister. “I’ve come with a solution. I can make you a better hero, Fubuki.”
Fubuki put a hand to her pounding chest. There was an unspoken agreement between them, as espers and as sisters, not to use their powers on each other. Though Tatsumaki’s use of power on her was brief, this was the first time she’d breached that contract since they were young.
Tatsumaki stood up, placing her hands on her hips. Now facing Fubuki fully, she could see the clear shape of her stomach through the younger sister’s dress, even some of the tantalizing skin beneath. With some difficulty, she continued despite the tugging in her crotch. “Being an S-class hero comes with a lot of responsibility,” Tatsumaki began. “Threats of dangerous villains come in daily. They’re not getting any weaker. But the worst part?” She rolled her eyes, a temple bulging out from underneath her head of green hair. “The fucking meetings.” She stepped forward, her voice boiling with anger. “You don’t know what it’s like, sitting at a table with a group of blowhards who think they’re hot shit.”
Fubuki raised an eyebrow. This sort of expressive irritation wasn’t unusual from her sister, but the crass language certainly was. Tatsumaki’s rant continued, but Fubuki found herself tuning out; the more agitated Tatsumaki got, the more her slight movements turned into noticeable motions. When she stood up, her petite body swayed from side to side, and her high-cut dress did little to hide the formidable package that Fubuki knew her older sister possessed. Even now, in its flaccid state, it poked out underneath her dress, peeking out from the sides. Her balls, too, were about as big as tennis balls and unable to be concealed.
Her sister had a cock, and it was massive, thicker than her, maybe even her leg.
Dazed and out of focus with her sister’s words, Fubuki found herself following the rhythmic movements of Tatsumaki’s dick. She shifted in her seat restlessly. Unfortunately for her, her own clothing was in a similar state as her sisters’: unable to contain the lewd nature of her own body. Her voluptuous curves were obvious, but even more so with the thin dress she wore was her stomach, protruding a good ways from her body. Unbeknownst to the younger sister, Tatsumaki’s eyes lingered on her middle, taking in every slight bump of skin, every natural deformation, every fold over itself. Both of them were zoned out slightly, taking in the hypnotic motions of each others’ bodies.
Tatsumaki cleared her throat. It was time to get to the point.
“Even I need a way to relax, Fubuki. I’m loathe to admit it, but you do, as well. You’re backed up.”
With great effort, Fubuki tore her eyes off the gentle swaying of Tatsumaki’s dick. “Where are you going with this?”
A knowing smirk came across Tatsumaki’s face. She reached for her own shoulders, pulling her dress so she let it fall to the floor. Stepping over the discarded dress, she was now fully naked, and hardening fast. As Fubuki watched, Tatsumaki stroked herself, and her cock responded in kind. It was at least ten inches flaccid, and had a ways to grow still, stretching up farther and farther up her torso the harder she got. Fubuki couldn’t look away. Again, without her knowing, her stomach swayed with her idle movements, seemingly eager to take this monster dick.
Tatsumaki’s smirk only became wider as Fubuki gaped.“Be my cocksleeve, Fubuki. I don’t trust anyone with this. They’d break before I’d get a chance to go anywhere. But you, Fubuki…” At this, Tatsumaki raised her free hand, enveloping her younger sister in a veil of green light. Though Fubuki’s instinct was to protest, she was still held in place, rapt by the absurdity of her sister’s cock. “We’re connected. You’ll be of use to me. If my cock doesn’t break you, anyway.”
Tatsumaki waved her finger, ripping apart Fubuki’s dress. Her necklaces clattered to the floor, sending jewels every which way. Her black lingerie followed suit, leaving her naked save for her knee-high boots. Tatsumaki released her and she fell to the floor. Her stomach bore the brunt of the impact, swaying wildly, up and down and side to side, as if it had a mind of its own. Tatsumaki licked her lips, watching the movements of her sister’s lewd stomach. 
Fubuki looked up. From this angle, Tatsumaki’s huge cock imposed on almost her entire field of view. Semi-erect, it had almost doubled in size, though it still looked soft. The musk filled her nostrils from here, a heady, overwhelming odor that she knew was her sister’s unique mark. She took a shameless, deep inhale, her stomach bouncing with delight.
“Don’t worry, I’ll buy you a new dress.” Tatsumaki motioned absently to the pieces of the expensive dress on the floor. Consider it my thanks for being my cocksleeve.”
Fubuki had a million protests, a million questions on the tip of her tongue. She was seconds away from being ravaged by her own sister, who possessed a pillar of cock that shouldn’t have been possible for a woman of her small stature. How would even half of that monster fit inside of her? How could she live her life normally, as a hero and leader, after her sister had her way with her?
There was no backing out now. Given the potency of Tatsumaki’s power, resisting was pointless. Given the moisture that pooled between Fubuki’s legs, maybe she didn’t want to resist.
Fubuki reached out and grasped Tatsumaki’s cock with one hand. She was unable to wrap her fingers around it. Tatsumaki smiled approvingly down at her, and a rush of adrenaline filled Fubuki. She wanted her sister to look at her like that more. She stroked Tatsumaki’s cock in earnest, taking her time in pleasuring the entire length. In her hand, it only grew further still, earning a sigh from her sister. The musk of it seemed to increase, and Fubuki buried her face in the massive meatpole near the base, sucking in the air desperately. Tatsumaki’s balls swayed beneath her.
“Good, good,” Tatsumaki hissed through clenched teeth. Now fully hard, she gazed down upon her sister with predatory eyes. “You came around, Fubuki. Already worshipping my dick? We should’ve done this much sooner.” She stepped back, her dick swaying from side to side so Fubuki could get a better look, and so she could get a better look at Fubuki’s supple, heaving stomach.
Fubuki couldn’t believe what she was seeing. Tatsumaki’s hulking monster of a cock had  more than doubled in size. It was the length of Tatsumaki’s entire torso, topping out at about twenty inches, and about half as thick. If Fubuki were in a right state of mind, she would wonder how her sister could even hide such a thing, but dazed as she was, all she could think about was how she could go about fitting it inside of her.
“Your training starts now, Fubuki. I think I’ll use…” Her eyes lingered over Fubuki’s lewd body, but it was obvious which she would go for first. “This.” She knelt down in front of her sister, prodding the gentle, warm flesh of her stomach with her dick. As she thought, it gave way, soft skin responding eagerly to the touch of her massive dick.
Fubuki started at the unexpected contact. “S-sister? What?”
Tatsumaki tsked, shaking her head. “Fubuki, are you so oblivious you didn’t know what you’ve been doing to me?” She nudged her hips forward, grinding her dick up and down Fubuki’s stomach. With how large it was, with how much area it covered, it accepted Tatsumaki’s dick easily. “Your stomach. I’m taking it for myself.”
Each time Tatsumaki thrust her hips, her girthy cock intruded on Fubuki’s face, filling her nose with that lewd scent once more. She accepted her fate, closing her eyes and greedily sucking in as much of the oppressive scent as she could, while she let Tatsumaki grind against her stomach. It molded itself to the shape of that massive member, the copious amounts of flesh sinking into itself. Tatsumaki threw her head back, sighing in delight. Her dick was throbbing, swarmed with pleasure, as she had her way with Fubuki’s lewd stomach.
Before Fubuki had known it, she’d climaxed multiple times just from having her stomach rubbed against. Her empty pussy spasmed and contracted. The floor beneath her was incredibly damp. Tatsumaki seemed to be in tune with every muscle spasm, especially because Fubuki’s climaxes made her stomach jiggle and shake violently each time.
“Fubuki…” Tatsumaki hissed, watching the folds and motions of her sister’s stomach, especially with how it seemed to close in and swallow up her massive cock. “You’re not getting off easy. I’m gonna claim every single one of your holes… but your stomach might be the most lewd of all.”
Fubuki could barely register her sister’s vow, because she was more or less lost to the overpowering musk of her sister’s dick. Her stomach was on fire, in complete bliss, as Tatsumaki continued to work her stomach, her eyes permanently glued to every jiggle, every bounce.
Tatsumaki stopped mid-thrust, her cock pressed into the forgiving folds of Fubuki’s middle. Her focus was ruined by the entrancing nature of Fubuki’s stomach - how exquisitely it shaped itself around her, caving into itself to create space of her dick. Her mouth hung open, her eyes glued to the bulging torso. She wanted to lose herself in it.
The ceasing of Tatsumaki’s rhythmic thrusting brought Fubuki back. She re-focused to see her sister completely rapt by her lewd stomach, her massive dick still throbbing needily. She saw her chance and climbed to her feet. Before Tatsumaki could react, Fubuki pushed her to the ground, her dick standing far upright.
“F-Fubuki?” Tatasumaki stammered, any smugness or control in her voice vanishing in an  instant. She struggled, but Fubuki waved her own hands. In an instant, Tatsumaki’s hands and feet were bound.
“It’s only fair, sister. You broke the rule, so tying you up with magic is fair game.” An icy chill laced Fubuki’s voice. She stood over Tatsumaki, her stomach swaying imposingly above her. Tatsumaki’s pupils shrank - right now, it seemed like Fubuki could use her bloated-looking stomach as a weapon, as a power over her. She felt like she couldn’t move, even if she wanted to. With Tatsumaki successfully inhibited, Fubuki squatted down, thoughtfully watching her sister’s massive dick, swaying with each breath she took.
“U-um, Fubuki -”
“Shut. Up.” Fubuki lashed out with her hand, ensnaring Tatsumaki’s shaft in a vice grip. Tatsumaki arched her back, pain lancing through her entire member. Fubuki squeezed on it, though engorged and stiff as it was, it wasn’t nearly as pliable as her own stomach. She stopped for a moment to consider this, and how quickly things turned around for her. She had qualities that Tatsumaki didn’t, and though her sister’s cock had been terrifying at first, here she was, helpless to her younger sister’s whims, massive dick and all.
“I’m not your helpless sister any more,” Fubuki snapped, moving her hands down to squeeze Tatsumaki’s dick closer to the base. Tatsumaki’s reaction, while uncomfortable and slightly pained, wasn’t enough. She went for the throat, grabbing at her sister’s hefty balls and squeezing them. This, she immediately discovered, was more forgiving flesh, especially where the folds of the nutsack met the base of her dick. She squeezed roughly, aggressively, pushing down where she felt the mass of Tatsumaki’s balls.
Tatsumaki cried out in pain, her balls being squished and compressed against her will. Yet despite, or perhaps because of, the humiliating nature of the situation, and after several minutes of foreplay, an orgasm churned in her nutsack, currently in the middle of being abused.
“F-Fubuki… I’m…” she grunted, her hips twitching of their own accord.
“You what?” Fubuki demanded, kneading her balls together roughly. “Are you ready to apologize for how you’ve had your way with me?” She squeezed down - hard.
Tatsumaki came without warning, her cock contracting visibly and shooting thick ropes of cum into the air. Ejected at a high velocity, they reached a height of at least eight feet, before coming back down to splatter anything and everything it landed on - Fubuki’s hair, Tatsumaki’s entire body, the floor, and especially Fubuki’s expansive stomach, staining them all in a viscous off-white. Fubuki clamped down on Tatsumaki’s dick as best she could, but given she could barely wrap both hands around it, she could only hope to slow her sister’s orgasm. She felt each powerful ripple, each wave of contractions through her hands.
The dull pain in her nuts only exacerbated Tatsumaki’s orgasm, as did the slight brushes of Fubuki’s stomach against her package. Her load was immense, and even as she came, she felt the humiliation of being brought to climax over having her package mis-handled, abused even. It washed over her, making her shiver. The warmth of her own cum, splattered across her own body, was slimy, adding to her shame.
Eventually, though, she came down and re-focused. The entire area around them was stained in her cum, and Fubuki’s body dripped with it. Her large belly was coated in the stuff as well, sporting a lewd sort of sheen, slick with seed. Fubuki released her grip on her shaft and nuts, and she relaxed.
The afterglow only lasted for a moment though, because Fubuki thrust her torso forward, the skin of her stomach slapping against Tatsumaki’s half-erect dick. Tatsumaki jumped, as she was particularly sensitive. “Sister…” Fubuki mused to herself, gyrating her waist so her large, round stomach waved side to side. Each time her rotund belly made contact with Tatsumaki’s dick, it made a lewd slapping sound, jigging at the force of impact and for moments afterwards. “Sister,” she continued, “you’re turned on by my stomach, aren’t you?”
Tatsumaki opened her mouth to respond. At least, she thought, she had this to save herself the last shred of dignity that she had left. But Fubuki raised her hand, and Tatsumaki’s mouth was sealed immediately, cutting off any protests the older sister had. Tatsumaki squirmed against her magical bonds, useless in every way to resist. Seeing the cold, unflinching look in Fubuki’s eyes, Tatsumaki could only manage a feeble nod.
Fubuki clicked her tongue, shaking her head from side to side. Her stomach bounced with the corresponding motion. “I can’t believe this. My sister, a top-class hero, reduced to a hopeless pervert.” Out of nowhere, she produced a minimal set of bonds - a silver cockring and two pairs of cuffs. She had Tatsumaki cuffed in no time, the older sister flinching at the cold metal that clamped around her dick. “Don’t worry,” Fubuki assured her, “these are infused with my powers. The cockring will expand and contract along with your perverted dick, but it will always be too tight for you to have any sort of release. The cuffs are the same - anti-psychic metal. You’re mine now, Sister.”
Tatsumaki bucked her hips up uselessly, her cock flopping up and down. Fubuki cackled at the sad sight, especially when it brushed up against her round belly. “You’ve gone soft already? Shame. Luckily for you, I know just how to get your hopeless dick going again~” she hummed. She mounted Tatsumaki once again, but this time she passed over her softening cock completely. She crawled forward until her stomach, large, bulging, and round, dangled over Tatsumaki’s face, casting a shadow over her.
“This is what you want. Isn’t it?” Fubuki said from above. Her expression was blocked by her massive stomach, even if Tastumaki craned her neck. It swayed temptingly, each stretch of skin forming to a perfect, round-ish shape, luscious and ready to be worshipped. 
Still, Tatsumaki wanted to say no. There was some part of her that knew this was wrong, that she had a reputation to uphold. But perhaps Fubuki’s psychic powers extended farther than she thought, because she couldn’t find the words to deny it. In the back of her mouth, she formed a protest, but somehow, someway, when it reached the front of your mouth, it became:
“Please, Fubuki. Smother me with your lewd stomach.”
Fubuki giggled, her stomach swaying. “Good girl, sister.” She pushed her hips forward, mashing her massive stomach into Tatsumaki’s face. Immediately, Tatsumaki was smothered in a sea of flesh. Everywhere she looked, smelled, and felt, was luscious, perfect skin. It was pliable and soft as down, emanating a natural warmth that Tatsumaki could lose herself in. All other sensations disappeared, the last of her protests melting away. She shoved her face into the wonderful belly as much as she could, feeling it give way around her. Greedily, she sucked in as many breaths as she could, drinking in the uniquely intoxicating musk of Fubuki’s stomach. Her mouth opened unconsciously, and she wasted no time in sticking out her tongue, dragging it along as much area of skin as she could. It was so soft, it felt like it was pushing back against her, responding, and she coated a small area of Fubuki’s stomach in her saliva.
“Good… Good…” Fubuki crooned under her breath. She began to rock up and down, dragging her stomach across her sister’s face. The supple skin covered her entire face, suffocating her, draping down her neck and matting her hair. Feeling her stomach attended to this much, having it kissed and massaged with Tatsumaki’s mouth, caused her to shiver in delight. Behind both of them, Tatsumaki’s cock began to stiffen once again, the cock ring first widening, then clamping down on the extended width. Neither of them noticed, however, as Fubuki was too busy enjoying shoving her stomach into her sister’s face.
Tatsumaki, meanwhile, had lost all semblance of reason and dignity. A single thought looped through her mind, ad nauseum:
Fubuki’s stomach. Fubuki’s stomach. Fubuki’s stomach.
First was the shape. It wasn’t a perfect circle, especially at the expansive front - little ridges and bumps of skin bulged out at random places, and her sides didn’t curve out neatly. But its imperfections made it all the more lust-inducing. And the motions - fuck, the motions - were impressive at worst and downright hypnotic at best. Fubuki couldn’t contain it within her clothes no matter how much she tried, and each turn, each sway of her hips, each up and down movement, made her stomach shift, jiggle, and bounce, many times more powerfully than the corresponding motions. Even the slightest motions caused violent shakes and jiggles. 
And right now, it was in Tastumaki’s face, all over her, its musk and taste in her nose and mouth respectively. She couldn’t get enough. There was no way she wasn’t getting the most of this opportunity. Her cock responded eagerly, springing to full hardness in a matter of seconds, as she was continually smothered by the gift that kept on giving: Fubuki’s stomach. She was completely entranced by its movements, its tastes and smells. Even as she shoved her face into it, she imagined watching it sway and bounce, her sister teasing her with her constantly moving belly.
Without so much as slowing her grinding, Fubuki looked back to see her sister’s cock returned to its fully massive size. She tsked once more, her voice dripping with disdain. With a snap of her fingers, a psychic tendril, needle-like in its thinness, snaked from her hand and locked onto Tatsumaki’s dick. It wriggled into her urethra, making the older sister cry out, stuffing her face even further into Fubuki’s stomach, using her face to knead the supple flesh.
“I can’t have you cum yet, Sister,” Fubuki chastised, as she let more of her weight fall onto Tatsumaki’s face, through her stomach. She continued gyrating her hips. “No… I have much better things in store for you~ Of course, this should keep you nice and pent up for the time being. If you can still cum despite that, your dick might be even more perverted than I first thought...”
What little of the words did register in Tatsumaki’s mind sent her further into this stomach-induced trance. Now fully hard and with her urethra plugged, she felt Fubuki pull off of her, standing over her with one leg on either side. She didn’t process any of this though, as her eyes never left Fubuki’s swaying stomach. When it moved to the left, so did her eyes. When it moved to the right, her eyes followed suit. Everywhere her stomach went, Tatsumaki was bound to follow.
Fubuki hummed to herself. “Looks like you’ll do anything I say, yes? As long as it means you may feast your eyes on more of this.” She grabbed the sides of her stomach, waving it up and down. Indeed, Tatsumaki’s eyes bounced up and down in their sockets, keyed into their every movement.
“Stand up.” Fubuki commanded, sharp and blunt. Tatsumaki squirmed half-heartedly against her bonds. It seemed like she was only half-listening, rapt as she was by Fubuki’s lewd, large stomach. “Oh, you can’t stand up, sister? Looks like I have to make you.”
Fubuki stepped off Tatsumaki, but swiped at her dick as she did so. She found purchase and pulled hard, upwards and forwards, with enough force that Tatsumaki’s back left the ground. This, of course, was accompanied by a rush of pain, one so great that she would have screamed if not for the tantalizing promise of Fubuki’s stomach. Even from this view, from behind, it poked out around Fubuki’s sides, and Tatsumaki could trace the round-ish curves with her eyes, which she gladly did multiple times over. 
“I said, stand up.” Fubuki hissed with more force, tugging on Tatsumaki’s dick even harder. Once again, pain lanced through every inch of Tatsumaki’s extensive length, but she hardly cared. Supported somewhat by Fubuki’s death grip along the way, Tatsumaki managed to stand on her feet. But Fubuki’s hold on her didn’t stop there - with another series of rough tugs, Fubuki began to lead her along. “We’re going outside.”
This time, when the words registered in Tatsumaki’s mind, she found herself able to formulate a response. It wasn’t the one that she normally would have had, given that she was still under the control of Fubuki’s rippling stomach. “If we go outside, I might be naked, Fubuki. I might show off my huge, perverted dick to everyone.”
Wait, what? B-but… But Fubuki’s stomach…
The words that gushed from her mouth, desperate and unhinged, seemed grossly inappropriate. But they were so right, coming from her. Anything to accelerate the process, to get her to worship Fubuki’s stomach quicker. Even if it meant going out in public. Even if it meant exposing her true nature, even as an S-class hero.
“That’s right, Sister,” Fubuki responded. Each time Tatsumaki fell slightly behind, she tugged on her dick, sending her hurrying to catch up. “What will you do when you see people staring at your giant, hopeless dick?”
“I-I don’t know what I’ll do.” Tatsumaki’s eyes were eager to drink in every bounce of Fubuki’s jiggling stomach. “I’ll see everyone staring at me, knowing that I’m an S-class hero. They’ll see me worshipping your stomach. They’ll see me rubbing it, kneading it, pressing my dick into it.”
“And?” They were at the door now. Fubuki’s hand lingered on the doorknob. Her other hand wrapped as best it could around Tatsumaki’s massive dick. Her stomach swayed slowly, in anticipation.
“I-I might cum in front of all those people. Just from watching your stomach from this long. Please let me cum in front of all those people,” she begged. Her mind could barely catch up with the shamelessly perverted things that spilled from her mouth. She knew this was wrong, but Fubuki’s bouncing stomach, and her sadistic smile, made it all worth it.
“We’ll see.” Fubuki swung the door open. Her stomach jiggled eagerly. Before she realized it, Tatsumaki had closed in on her, inserting her dick between the gap between Fubuki’s thighs. A pair of grabby hands descended on her stomach, kneading the excess of flesh, before cradling the underside. The jiggling didn’t stop completely, but it did tone down its intensity, its hypnotic motions. Tastumaki didn’t mind, though, because it meant she got to sink her hands into more of that perfect flesh.
“Tch.” Fubuki sneered, not even giving her sister a look over her shoulder. “What is it now? You don’t want people to realize an S-class hero is actually a degenerate siscon?”
“Fubuki,” Tatsumaki murmured into her sister’s back, “I don’t want other people to realize how alluring your stomach is. It’s too lewd for anyone else to see.”
Fubuki’s mouth twisted up into a wicked grin. “Oh? That’s what’s perverted here, Sister?” She asked with bated breath, waiting with barely-contained delight to see her sister’s reaction.
Tatsumaki simply nodded. She peeked around the side of Fubuki’s waist, her eyes still glued to Fubuki’s slightly swaying stomach. “Yes.”
Fubuki threw her head back and laughed heartily. Taking stock of the situation, with the cool evening air drafting in through the open door, she noticed how Tatsumaki’s hefty balls were nestled between her capable, rippling thighs. Her devious smirk grew. “We’ll see about that.” Reaching down and tugging Tatsumaki’s dick, she urged the both of them forward. “Go.”
They stepped out into the night together. Though she was still held captive by her sister’s stomach, Tatsumaki also felt an uncomfortably pressing sensation from the first step they took. Literally, her dangling nuts, sandwiched between Fubuki’s thighs, were being squeezed, almost crushed, between those powerful tools with each stride. Her balls, already sensitive still recovering from being manhandled, were absolutely on fire with pain. She shivered with delight, because she loved the feeling, and because there was nothing she could do. 
Fubuki felt her sister’s balls obstructing her stride. Curious, she squeezed harder. Tatsumaki emitted a piercing moan - her poor balls were being crushed to the point that they were giving in, deforming and becoming misshapen masses under the powerful force of Fubuki’s thighs. This acute pain fought in her mind with even the power of Fubuki’s hypnotic stomach as the dominant force - her overly sensitive nuts felt like they were going to burst. Unbeknownst to her, they were about to burst - just in a different way than how she feared.
All of a split second passed before Tatsumaki realized this wasn’t the end of it. Her orgasm overwhelmed her without warning; she jerked her hips forward. Her dick rippled painfully, powerful contractions without a payoff, since the magical plug in her urethra kept all of her thick seed bottled up. The pressure in the base of her dick grew as she grunted and mewled pathetically, jerking her hips in erratic motions. This only succeeded in pulling against her confined sack, still being squeezed by Fubuki’s thighs, amplifying her pain.
“Oh?” Fubuki began. She felt each animalistic throb of Tatsumaki’s mashed balls, pleading for release. “Are you -”
She was unable to finish her sentence, because Tatsumaki’s delayed orgasm proved to be too strong even for Fubuki’s magical plug. Hot semen gushed out from her cockhole with incredible force, already a few pints’ worth of it flying across the street and landing on the opposite sidewalk. Its markings were visible from where they stood in the doorway. 
Tatsumaki moaned shamelessly, her deformed nutsack pulsing more powerfully than her dick, as the force of her ejaculation caught up to her. Her orgasm rocked her whole body, and she gripped Fubuki’s stomach harder in her hands, her nails digging into the folds of the excessive flesh. Each cumshot was just as powerful than the last, and she soon coated a good portion of the street in her viscous cum.
Fubuki sighed, watching Tatsumak’’s dick twitch repeatedly from below her globular stomach. From this angle, it seemed like she herself was cumming. “I made sure you wouldn’t cum unless I told you to, and you came anyway. And you came because I was torturing that gross, oversized nutsack of yours. I don’t know what to do with a pervert like you, Sister.”
Tatsumaki only grunted in response, surrendered to the throes of her ongoing orgasm. Her fingers continued to roam the seemingly unlimited amount of flesh - no amount of tummy rubbing would be enough for her. Fubuki’s expression was unimpressed, impatient, as she waited for her sister’s orgasm to subside; she even pressed her thighs together harder, compressing her sister’s balls even more. But seconds passed, and turned into minutes, and still Tatsumaki didn’t come down from her climax.
Tatsumaki’s grunts had slowly descended into more inhuman noises, resembling something more like pathetic, helpless yelps as her giant dick continued to pump out her seed into the street. Tatsumaki didn’t know what to make of this. Her body was in a state of perpetual bliss, and her mind was completely muddled, yet centered on two things: the pain and pleasure of her balls being squished, and Fubuki’s incomparable stomach.
“Fubuki,” Tatsumaki grunted. Her own voice sounded distant, detached, like it didn’t belong to her. Indeed, with the near short-circuiting of her brain and her nervous system, that very well may have been the case. “I can’t stop cumming.”
“Oh?” Fuubki sighed. Her own hands moved to interlock with her sister’s. Together, they roamed the plane of her stomach, sending a rush of pleasure through the younger sister’s voluptuous body. “What about it?”
“U-um…” Tatsumaki stammered, suddenly at a loss.
“You like getting your nuts crushed, hm? Is that why you’re lasting this long?”
The unrelenting pain of having her nuts crushed made Tastumaki want to scream in protest. But, for some reason or another, perhaps because of her ongoing orgasm or her continued focus on Fubuki’s stomach, she said: “Crush my balls as much as you want, Fubuki. I don’t see anything wrong with it.”
Wait, what? Tatsumaki thought to herself. Seeing Fubuki nod, along with her powerful, fit thighs squeezing down harder on them, making them burn even harder, stifled any negative words she had about the matter.
“Fufufu~” Fubuki hummed. ”We’ve kept our audience waiting long enough.” Without waiting for a response, she took her first deliberate stride forward. Tatsumaki’s nuts screamed in pain as they were aggressively compressed, but her cock responded with an even more powerful spurt.
Up until now, standing in front of Fubuki’s house like this, they hadn’t passed a single soul fortunate enough to witness their desperate play, how they hungered for each other. But their timing was as fortuitous as ever; after less than a minute of walking, with Tatsumaki’s balls being crushed over and over with each rub of Fubuki’s toned thighs, they entered a district with much more foot traffic at this time of night. Tatsumaki’s orgasm hadn’t subsided even a little bit, painting out a lewd trail of cum, for them to both follow as they walked and to leave behind the marker of their love.
“Fubuki,” Tatsumaki begged, her voice dripping with desperation. “I’m not being crushed enough. This isn’t perverted to me.”
“Really?” Fubuki pressed her thighs even closer together.“ Though Tatsumaki’s sizable nuts were in the way of them meeting, the poor, abused balls were so squished at this point that her thighs almost rubbed up against each other. “Having your balls tortured and walking around in public, while worshipping your sister’s stomach isn’t perverted for you?”
Out of the corners of her eye, past the expanse of Fubuki’s alluring stomach, she could see a handful of passerby, walking a good distance away from them as much as the sidewalk could allow. Whispers of conversation, directed not at them but about them, somehow reached her stomach-addled brain.
“Oh my god, what are those two doing?”
“Don’t they know they’re being indecent?”
“Maybe they’re under someone else’s hypnotic control?”
“Wait… Those are the Esper Sisters? There’s no way they’d be mind controlled by someone else?”
“You mean…”
Several more mutterings went unprocessed, but the general buzz and clamor around the pair got louder. People parted like magnets around the two of them. The whole time, Tatsumaki’s nuts felt like they were about to explode, her perpetual orgasm, leaving ropes of smelly, sticky cum in their wake, only exacerbating this.
“I think it’s time we mix things up again~” Fubuki chirped. Their progress ground to a halt, and they stood there. Tatsumaki’s huge dick continued to spurt pathetically. She didn’t mind, and didn’t care about much else, as long as her sister allowed her to sink her hands into that heavenly stomach skin.
But without warning, it was coldly ripped from her desperate grasp. Fubuki released her thighs’ vicegrip on Tatsumaki’s balls. Now disturbingly crushed, they swung between her legs, misshapen and deformed. But Fubuki unlatched herself from Tatsumaki completely, stepping away and turning around, massaging her stomach teasingly. “Can you survive without my stomach, Sister?” she questioned. Tatsumaki gaped, her mouth hanging open and drooling at the sight. Now that that stomach was ripped from her, a dark void rushed to fill its place, stopping her orgasm as a single half-spurt brought it to a screeching halt. She reached her hands out in front of the pedestrians on the street, who could all see her silently begging to a chance to feast her hands on that stomach once again.
Fubuki disappeared behind a previously unseen corner, a gap between two adjacent buildings. The moment her stomach was out of sight, Tatsumaki’s hands fell limply to her sides. She sank to the ground, not even processing the fact that she knelt right on top of her abused nutsack, her rear sinking into the myriad folds of that sensitive skin. She didn’t process the screaming pain of that, either. Every last drop of will was sucked from her body the second that she wasn’t able to worship that god-like, perfectly lewd stomach.
How much time has it been since I was last able to lay my eyes…?
In truth, only a few moments had passed, but in Tatsumaki’s mind, she already felt starved, deprived. Her body was completely shut down, her mind fixated completely on that jiggling, bouncing stomach, which lay only a few feet out of sight from her. Not that that mattered.
From behind the corner on the alleyway, Fubuki watched all of this. Tatsumaki, her sister who’d always had the upper hand on her, was reduced to a pathetic, humiliated mess on the street. Whereas she’d sneered at Fubuki from above so many times before, now she was rendered completely useless without Fubuki’s stomach to depend on. Even her oversized, veiny cock, a terrifying weapon at first blush, was now another instrument of humiliation, still spurting out the occasional strand of semen into the street in front of her. Her balls were even worse off, abused, manhandled, and crushed to the point that they looked deflated.
Fubuki, as well, was attuned to the sickened, yet curious, air of chatter on the street.
“That is the Terrible Tornado! What happened…?”
“DId she get defeated?”
“What’s with that monster dick?”
“She looks pathetic, hunched over like that. She’s muttering something under her breath, too…”
“The mighty really have fallen, huh?”
Fubuki covered her mouth, shaking with delight. Hearing her older sister reduced to this gave her dominance a renewed rush of vigor. Of course, with their psychic connection as sisters, she knew that this wasn’t enough, for either of them. It was time to move on.
“Come, Sister.” She rounded the corner again. Her oversized, jiggling stomach was the first to come into view. Immediately, Tatsumaki shot back up, her useless-looking, misshapen balls dangling of their own accord. “I have plans for you yet.”
“Yes, Fubuki,” Tatsumaki responded immediately. She reached out, yearning to feel that heavenly skin in her hands once more. “Do with me what you wish. I won’t mind it.”
“That’s my obedient Sister.” Fubuki offered Tatsumaki a sneering, degrading smirk. She turned around when the glazed look in Tatsumaki’s eyes was adequate for her, as well as the drool she didn’t seem to be aware was escaping her mouth. “Grab my stomach, and I’ll lead you.”
Tatsumaki complied silently. The moment her fingers sunk into the warm, forgiving flesh, she forgot about almost everything else. The moment she inserted her huge dick between Fubuki’s thighs, crushing her already sensitive, already sore balls once more, she truly did forget about everything else. The last of Tatsumaki’s worries was where they were going; she’d follow Fubuki and her tempting, lewd stomach everywhere.
They made their way to the store like this, surrounded by gawkers. All of them commented on the incredulous nature of their situation, but no one stopped them. They all just watched Tatsumaki, once a noble S-class hero of high standing, reduced to a degenerate stomach-worshipper who liked having her massive nuts crushed by her sister. Of course, having her genitals tortured like this started up her endless orgasm anew, carving out a new trail for them to leave, the marker of their degeneracy.
Once outside the store, Fubuki released herself from Tatsumaki once again. She turned around to face her, her stomach jiggling almost restlessly. “I would say that I regret having to do this, but… I don’t.” Fubuki flashed another wicked grin down at her older sister, whose dick twitched in anticipation. 
“What is it, Fubuki?” Tatsumaki panted. “Anything you want, I’ll do. Just… just don’t take your stomach away from me. Please.”
“Oh, this?” Fubuki ran her own hands across her large stomach, feeling it wave around. Tatsumaki gaped hungrily. She tsked. “This is for your own good, Sister.” She held out her hand, clasps and cuffs rising from seemingly out of nowhere and honing in on Tatsumaki’s hands and feet. Once they latched on, they forcefully dragged Tatsumaki’s body against a nearby streetlamp, her back pressing hard against the cold metal. The cuffs wrapped around the circumference of the pole, tying her up flush against the metal.
“You look good there, Sister,” Fubuki hummed, her eyes moving from Tatsumaki’s abused nutsack to her giant dick. Fully erect at twenty inches long, it was still bound by a cock-ring at the base. “You’re supposed to be plugged up right now, hm? Well, no matter. I prefer that you cum until you can’t cum anymore. I’m a kind sister, so I’ll help you out, yes?” Again, seemingly out of nowhere, she produced a cardboard sign. Scrawled in black marker were the words “PLEASE USE MY STRESS BALLS. USING MY HOPELESS DICK IS OPTIONAL.” With her powers, she plastered the sign right above Tatsumaki’s head. Tatsumaki didn’t even try to look at it.
“H-how long are you going to be gone, Fubuki?” Tatsumaki pleaded. She shifted half-heartedly against her restraints, the swaying of her dick and balls amplified. “I can’t be separated from you, or your stomach.”
“Fufufu…” Fubuki turned around, her stomach swaying. “I can’t say why, but I have a feeling you’ll enjoy yourself while I’m gone.” She snapped her fingers, a psychic shockwave spreading out from the two sisters. Nothing seemed to change, at first glance. “I won’t be long.” With that, she strode into the store, the doors shutting behind her and her incredible stomach.
Tatsumaki’s reaction was the same as the first time: she completely shut down. She slumped over, held up only by her binds, her head almost knocking against her stiff meat rod. If she were more conscious, more capable of thought independent of Fubuki, she would have wondered, anticipated even, Fubuki’s vague proposal.
She got her answer soon enough, and more than firmly enough. Not having a grip on the time that passed, it seemed like people bobbed in and out of her vision at a breakneck pace. Words floated in one ear and out the other. She could pick up snippets of conversations, of observations, of words muttered privately.
“Not every day…”
“...fondle these…”
“...Terrible Tornado…?”
The only constant among these rush of people were her abused genitals. Her balls were completely overwhelmed with pain. Hands from all over touched her nutsack, ranging from soft caresses, unforgiving squeezes, and nails scraping against her scrotum. She wanted to scream, but her mouth hung open uselessly, only desperate pants escaping her.
More words floated through her mind, spoken by the myriad passerby who stopped to use her. They were clearer this time.
“Looks like fun.”
“She’s enjoying herself.”
“What can we do with these stress balls…?”
Abused as her nuts were, as they were at the mercy of the public, another realization wormed its way into Tatsumaki’s useless brain. Fubuki’s finger-snap earlier had done something to her balls - there was so much sack for these hands to roam, to explore, to kiss, even. The words formed sluggishly in her mind.
Fubuki refilled my balls again. 
It was true, her abused nuts seemed to have forgotten the imprint of their constant torture, and were as pert and heavy as they’d been before, heavier even.
“These balls look delicious…”
Tatsumaki flinched, feeling someone wrap their lips around a good portion of her sack, trying to gargle one of her giant balls in their mouth. It was impossible, of course, given how massive they were - at their current size, at least. But this set of jaws was particularly persistent; through the skin, they kneaded the seed-producer in its mouth, slowly working more and more of it in. This, of course, was possible through the slow but steady crushing of her right nut, once again collapsing under the force of those teeth so it could fit in whoever’s mouth was lucky enough to take it.
She was cumming. She hadn’t realized it, but with her balls fat and ready to blow another massive load, her body had wasted no time in sending her cock into another frenzy, though it was still choked by the cock-ring. This was trivial to Tatsumaki, as she was being publicly used, having her ball destroyed just minutes after having it essentially regenerate. This acute, unbearable pain was the reason for the orgasm that now overtook her - she loved having her balls manhandled, abused, and crushed. She didn’t know where her seed reached or where it spilled. She vaguely felt one, or maybe two, or maybe several, soft fleshy tunnels wrapping around it, being rewarded with excess payloads of her thick, potent cum, but all that mattered to her was how she was being so humiliated like this, tied up and useless.
The public use and humiliation continued for an indeterminate amount of time. Each voice, belonging to someone that used her, commented flippantly about the position Tatsumaki was in, or how ripe her balls were for being brutalized. She didn’t know how much she came, or how long, until the damp musk of all her cum finally reached her brain through her nostrils. Her output was more than excessive - it was absurd. That wasn’t even counting the amount she’d blown inside any of the passerby that used her - not that she had any way of knowing.
A voice reached into the darkest recesses of her mind and began to pull her out of the cesspool of degeneracy that surrounded her public use platform. “Sister, I’m back~” The voice was cheery and bright. Tatsumaki would have guessed that it had been spoken to her telepathically, but then the doors to the shop opened.
Tatsumaki raised her head, sweat coating her forehead. When Fubuki walked out, she saw her sister alone, the crowd having used her relentlessly now dispersed. “Were you a good little public fountain while I was gone?”
Tatsumaki stared as her sister’s stomach came into view, bouncing and jiggling as it always did. When Fubuki walked up to her, it crowded most of her vision, and she wouldn’t have it any other way. She affixed her eyes to it, never intending on looking away from them again. “Yes, Fubuki. I was used appropriately.”
“Good girl.” Fubuki stroked the top of her sister’s head, noting how one of her nuts had been crushed again. “I brought your reward~” She produced the one thing in her shopping bag - a long, 15-inch cleaner with silicon bristles. It was thin, about a third of the width of Tatsumaki’s dick. She ran a finger across its bristled sides, watching how they bent easily to her. “Your balls have been properly destroyed, going on twice now. How about we subject your perverted, oversized dick to the same treatment?”
Tatsumaki saw the drain cleaner out of the corner of her vision, since she was still visually worshipping Fubuki’s stomach. Her mind protested, but once again, docile, non-aggressive words were what came out. “Yes, Fubuki. Use my cock however you wish.”
“Good.” Fubuki bent down, but not enough to obscure her stomach from Tatsumaki’s view. She gripped the head of that massive dick in her hand, noting its musk, and how it still dripped with the residual of Tatsumaki’s last climax. Lining up the drain cleaner with her sister’s dick, she tested it against Tatsumaki’s virgin urethra, having only been spread by psychic means earlier. She had yet to experience an actual object violating her peehole.
This, of course, did not dissuade Fubuki. After confirming that Tatsumaki’s urethra would part a little bit, and not nearly enough to spread for this cleaner, Fubuki shoved it in. Tatsumaki’s urethra gaped, being forced to swallow it, but with enough pushing and shoving, it went in cleanly.
Tatsumaki howled, throwing her head back. If having her balls crushed was painful, having her urethra forced open was simply brutal, unbearable, even. As inch after inch was shoved down her cockhole, she felt the silicon bristles dragging up against the walls of her dick, still tender and sensitive from being used just moments prior. Her cock was alight with pain, every single of its myriad nerves already screaming for relief. But the sudden onslaught of pain brought on a different sensation altogether, one that Tatsumaki was shamefully getting used to.
This orgasm, her fourth (or was it fifth? She was rapidly losing count) of the night, was even more excruciating than her last couple. Whereas those had her cum forced out despite the cock rings and magical plugs, having a physical obstruction blocking the flow of her urethra was a new level of agony. Plugged up by the cleaner and its bristling extensions, her cock visibly swelled, her thick seed trapped in her urethra, only amplifying her pain. However, the cleaner didn’t stop the rush of cum completely. Instead of gushing out, it dribbled out from her cockhole pathetically, which contrasted both with her previous orgasms and the desperate contractions of her huge dick. Slowly, slowly, more and more was forced out. Fubuki sneered down at this sad sight from above her, her stomach swaying in delight.
“Sister…” Fubuki let out a mock sigh. “Your degeneracy knows no bounds, hm? If we didn’t have these psychic powers, your perverted dick and balls would be ruined beyond repair. You know that, right?”
Tatsumaki’s face was beet red, straining constantly to let her semen flow more freely to no result. “Y-yes,” she grunted. Fubuki’s stomach in her view was the only thing keeping her head up.
“Well. I think we’ve loitered around here long enough. Let’s make our way back.” Fubuki snapped her fingers once more, and Tatsumaki’s bounds undid themselves, clattering to the ground. Fubuki saw that her sister’s wrists and ankles were sore from excessive strain. Tatsumaki didn’t feel it, as she had other things to worry about. Once Tatsumaki was released, she slumped forward, her hands clutching desperately at anything to stop her fall. If she didn’t, she’d fall on her massive package again. Thankfully, Fubuki’s stomach was there to stop the fall, and Tatsumaki’s face was buried right into the cushiony, pillowy flesh.
Fubuki clicked her tongue. With some effort, she turned on a heel, letting Tatsumaki grope and grip her stomach from behind. Tatsumaki automatically slotted her dick and balls between Fubuki’s powerful, toned thighs. “Come, Sister.” Fubuki commanded. She stepped forward, but Tatsumaki didn’t move.
“Fubuki… Wait, please.” Tatsumaki begged, grunting into Fubuki’s back.
“What? You dare to ask something?” Fubuki responded coldly.
“U-um…” Tatsumaki hesitated. She was still conscious, sentient, even. Despite her irreparable fixation on Fubuki’s stomach, as well as the constant pain that coursed through her dick and balls, something was off for her. 
“Speak.” Fubuki commanded.
“I-I want you to use me,” Tatsumaki tried. That wasn’t enough for her, so she pressed on. “You call me Sister, but... “ she grunted in pain as Fubuki’s thighs closed in on her balls, specifically her left nut which hadn’t been brutalized a second time. “I don’t feel like your sister right now,” she finished hurriedly.
Fubuki kneaded and compressed Tatsumaki’s nuts, rubbing her thighs up against each other. Tatsumaki jerked her hips, her cock twitching needily. “Hm… So this isn’t perverted enough for you?”
Tatsumaki shook her head. “It’s not perverted enough. I don’t feel dirtied, sullied beyond repair.”
Fubuki nodded. “You wish for your humiliation to extend beyond physical bounds? Your ruined balls and tortured cock.” Tatsumaki nodded desperately. “Very well,” Fubuki said without a moment’s hesitation. “From now on, you are my stomach cushion and mine alone.”
The word “stomach” sent a few tendrils of desire burning through Tatsumaki’s core, not that she understood it completely. “What does that -”
Fubuk cut her off with a slap to the dick, digging her fingernails into the over-sensitive flesh, raw from multiple orgasms and heavy use. “Stomach cushions don’t talk.”
Tatsumaki didn’t know what exactly Fubuki had in store. But with the silicon brush shoved up her urethra, her left nut well on its way to being crushed again, and her dick constantly twitching under heavy abuse, she knew that Fubuki had yet another delightfully masochistic idea in store. She nodded, and in the same way that they came to the store, they left: with Tatsumaki’s package nestled in between Fubuki’s thighs, and the stomach cushion’s hands groping and fondling that top-class stomach.
On the way back, the public whisperings and overall spectacle seemed even more distant to Tastumaki, but still, she was able to digest bits and pieces of it, usually sentences picked out of a larger, collective conversation centered around the two.
“Oh, what a nice sight.”
“It’s a nice night for a walk, isn’t it?”
“Is there something sticking out of her urethra?”
“Her balls aren’t in good shape.”
“I’d want the Blizzard of Hell to dom me, too~”
This time, because of the soft plug in her urethra, her cum continued to trickle out at a pathetic rate. Her cock now bulged at seemingly random parts, the overall backup of semen growing to unbearable levels. They passed the same trail of cum they’d left on the way to the store, its musk just as strong, and left a smaller, less impressive trail in their wake on the way back to the house. This time, Tatsumaki didn’t say a word, as a good, obedient stomach cushion would. In turn, Fubuki let Tatsumaki worship her stomach to both of their hearts’ content, crushing her balls to an acceptable level in the meantime. Occasionally, she would reach down. The handle of the silicon brush stuck out of Tatsumaki’s dick, like a “Pull Me” string on a toy. Fubuki happily obliged, yanking it almost all the way out before pushing it back in mercilessly. Given her stomach cushion’s strangled yelps and mewls each time she did this, Fubuki guessed that her cockhole was getting molded around the shape of the brush.
When they finally reached home, Tatsumaki’s dick and balls were even more claimed, even more ruined than they had been when they left. Her nuts had once again been flattened, her previously tight, winking cockhole now gaping several times wider to accept the brush.
They stepped through the landing, Tatsumaki’s cock weakly leaking cum the whole way. She seemed drained, her brutalized balls almost completely spent of her vast, previously endless load. They took the last several steps through the hallway, and at last, they stood in the living room, the site of their previous degeneracy. It seemed distant now - the type of power play Tatsumaki forced on her a thing of the past.
Fubuki stretched her arms above her head, yawning overdramatically. “I’m beat.” She waggled her hips from side to side, watching Tatsumaki’s giant dick sway between her thighs. “It was a long walk, but my stomach…” She sighed, using her hands to fondle her own midsection, watching as it jiggled. “It could use a rest. I’ve been carrying this around all day.”
With some effort, she wrested her stomach away from Tatsumaki’s clutches. She turned around, making sure Tatsumaki’s eyes were glued to her belly as she shook it, stroked it, massaged it, and did every lewd thing imaginable to it, all the while making exaggerated eyerolls and sighs. “Just… so tired. Would you like to help out… stomach cushion?” she intoned suggestively.
Tatsumaki gaped, not quite understanding what Fubuki was proposing. She opened her mouth, but remembered that she couldn’t speak. Her dick swayed restlessly, her ruined balls dangling among the now excess of skin that was her ballsack. The silicon brush was still jammed up her urethra. Fubuki took this all in, then held out her hand. Tatsumaki was surrounded in a green glow, lifted off the ground before Fubuki set her down unceremoniously between the two couches. Tatsumaki landed hard on her dick, the impact of the landing shoving the brush even farther up her cockhole. She convulsed with pain, on all fours and at the mercy of her sister. More spasms of pleasure rocked her body at being treated like this, but her spurting, contracting cock didn’t bring any more semen spilling forth. She was completely spent.
Fubuki stood over her, imposing on her mind just through her sheer presence, and the sheer mass of her large stomach. “You look like a good, comfortable cushion right now,” she observed. “The perfect place to rest my stomach.” Fubuki knelt down. She observed Tatsumaki’s huge cock peeking out from underneath her torso, the brush sticking out in the same manner as it did before. “Stomach cushions don’t talk… but in this case, I think they can clean themselves. Shove that in and out while I rest,” she commanded.
Even if Tatsumaki were in a position to protest, she wasn’t given the time. Fubuki knelt down and draped herself over her former sister, turned stomach cushion. Fubuki made sure to let most of her weight give out, and as a result, most of her pillowy, heavenly, pliable stomach skin pressed deeply into Tatsumaki’s back. Her skin kneaded and folded itself, much of it spilling over the sides of Tatsumaki’s back. Tatsumaki was completely blanketed, the warm, inviting sensation of Fubuki’s stomach overwhelming her senses. 
“Ah… this is more like it. I should have done this sooner,” Fubuki sighed. She relaxed even more, making Tatsumaki almost buckle under the weight of her stomach. “I don’t see you moving,” she noted.
Tatsumaki had been too dazed by Fubuki’s stomach to obey her earlier command. Steeling herself, she reached all the way up the length of her cock to firmly grasp the brush handle that stuck out of her peehole. She drew it out slowly, feeling her urethra clinging desperately to the flexible bristles. She also felt her urethra contract back down to its regular size, though the soreness and burning still remained. Taking a deep breath, she pushed it back in. Her entire body writhed at the immediate pain that seared through her entire dick, and her subsequent convulsing caused Fubuki’s stomach to ripple as Tatsumaki squirmed underneath the dominant sister.
“Again.” Fubuki commanded.
Out it went, and back in it went, as did another flash of white-hot agony. Tatsumaki knew she would have been cumming if her balls weren’t completely destroyed. She also knew she probably would have passed out from the pain, if she didn’t have the wonderful sensation of Fubuki’s ever-generous stomach providing her with sustenance, keeping her afloat.
“Faster.” Fubuki snapped. She rammed Tatsumaki’s hip with her knee. Her stomach felt relaxed, much better, but it still moved and jiggled, compressed as it was.
Tatsumaki obliged. She shoved the brush in and out of her cockhole mercilessly, subjecting it to the same brutal treatment that her balls had already received twice over. Her urethra was stretched out several times past its normal limit, and she gazed upon it, rapt, as she knew it couldn’t return to its original size without the use of psychic powers. Of course, her mind was still crowded with thoughts of Fubuki’s stomach pressing into her. She never wanted to get up and leave from this position.
This was her life now: destined to be her sister’s, her brutal, cold, unforgiving dom’s, her goddess’s, stomach cushion. Her massive dick and balls were to be tortured and broken, then repaired only to be brutalized once more. She wouldn’t experience the ecstasy of cumming until they were regenerated, but as long as she had Fubuki’s stomach to feast her eyes on, to dig her greedy, degenerate fingers into, she would gladly endure the pain ad infinitum.