tags: huge dick, implied/referenced cuckqueaning?, cervix penetration, cumflation, rinpana (mentioned rinmaki)

~

“Happy birthday, Rin-chan!” Hanayo peered through the camera’s viewfinder, framing her girlfriend in front of her ice cream birthday cake. Rin cheesed the camera, looking happy as ever with a pair of cat ears atop her head.

“Thanks, Kayo-chin!” Rin puckered her lips, and Hanayo giggled, blowing Rin a kiss in return. “I’m sure I’ll love the present you got me, nya~” She cut the cake herself, handing Hanayo a slice. 

Hanayo nodded, already distracted by both the cake in front of her and by the present that sat in the box. She’d spent a lot of time browsing in the weeks leading up to Rin’s birthday, especially in light of recent events. “Go ahead and open it.” She nodded in the direction of the box.

With a smudge of cake on her left cheek, Rin started to undo the wrapping. Peering into the box, her face bloomed with excitement, and she triumphantly pulled out the pair of flats within. “These are so pretty! Thanks, Kayo-chin.” She turned them over in her hands. “The material’s so nice, nya…”

“Try them on!” Hanayo encouraged. Today, Rin was wearing a cute skirt and blouse at Hanayo’s insistence. The combo would work well with her new shoes.

“Right now?” Rin tilted her head, and when Hanayo nodded vigorously, Rin stood up and eased herself into the flats, one at a time. “How do I look, nya?” She smiled at Hanayo, nervous but happy.

Seeing Rin enjoying her present, Hanayo breathed a sigh of relief. “Great! Let’s finish our cake.”

The first half of her present out of the way, Hanayo now had to figure out when to spring the second part onto her girlfriend. As they resumed eating their cake, Hanayo found herself tuning out Rin’s chatter, only answering absentmindedly.

On the surface, they were spending a carefree birthday together, as a happy couple would. But lately, Hanayo had become painfully aware of Rin’s darker side. Satisfying her lifelong partner in bed had always been an issue for Hanayo, because of... reasons out of her control. But ever since she’d stumbled upon Rin satisfying herself in a different way, Hanayo had been unable to wrest the image from her head.

It was burned into the back of her retinas: Rin, using their mutual friend Maki as a helpless cocksleeve. Maki, who was in a committed relationship with their other close friend, Nico. That same Maki was reduced to a babbling mess, at the complete mercy of Rin’s ridiculous cock. Thicker than her arm and almost as long, the term “third leg” might have been a more accurate descriptor. And against all logic, Hanayo had witnessed every single centimeter of that towering, hulking mass of meat thrust over and over… and over again into Maki’s poor, battered pussy with an urgency that she could only describe as “primal.”

Then, there was the matter of what came after… Not just the liters of seed Rin pumped into Maki, making her stomach bloat and swell, but the incredibly awkward conversation afterwards. Once Maki could formulate basic words, the two couples shared apologies all around, walking away as intact as they could be. Somehow, they’d managed to avoid a nasty fallout between every party involved. But amongst the many questions Hanayo was left with, one took priority above all else:

Did Rin’s cock really feel that good?

In the weeks since, Hanayo had seen the glances that Rin and Maki stole between each other. She knew that Rin was out of the house more often, and she only needed one guess for where Rin was going: making Maki her cock-slut. She overlooked it, telling herself that she was better off not trying to get impaled by a 60-centimeter meatstick.

The absurd length and thickness of Rin’s cock was terrifying. No two ways around it, Hanayo never thought she’d be able to take something like that, so she never tried.

But if Maki could handle it, enjoy it even, then…

“Kayo-chin?” Rin leaned across the table, scrutinizing Hanayo’s face. “You’re spacing out again…”

Hanayo swallowed hard, eyes flickering to Rin’s crotch. The monster cock she had between their legs, intimidating even when flaccid, was hidden, but that made Hanayo no less aware of this. 

“U-um…” Hanayo finished her cake and scrambled out of her seat. “I’ll be right back…” She hurried away. As she left, she felt Rin’s eyes tracing her voluptuous figure, right down to her large breasts and wide hips. She and Maki shared this trait. Did that mean…?

Hanayo shook her head. She reached the door to their bedroom and slammed it shut behind her. This was where the second half of Rin’s birthday present was hidden. Hanayo’s eyes immediately went to her nightstand. Was she really going to go through with this? She couldn’t get the image of Rin’s massive dick out of her head, and she really couldn’t get the image of Rin ramming Maki with every single centimeter of that length. Maki’s stomach bulged, the outline of Rin’s dick fighting against her skin every time she pushed inside. Then, Rin hitting her climax, her engorged balls full of potent seed which she shot over and over into Maki, making her stomach balloon -

Hanayo gasped. Reaching a tentative hand down her skirt, she flinched when it came away slick. She brought it back up to stare at it. She couldn’t believe she was getting off on this - her girlfriend using one of their best friends as a cocksleeve. Yet the secondary feeling in her mind, arousal taking the primary spot, wasn’t anger or shame - it was jealousy. Jealousy at not being the one in Maki’s place, at Maki having the privilege of wrapping her body around Rin’s third leg of a cock.

Her body moved before she could think: she stuck out her tongue and tasted herself. Sliding to the floor, her back still against the door, Hanayo reached back down to her nethers and began to pleasure herself, working her fingers against her sensitive outer folds, gradually moving closer to her soaked center. One finger slipped in with ease, and she gasped, bucking her hips up slightly to aid herself. A moan slipped out of her mouth unbridled, and desperately she fumbled with her shirt, biting into the fabric to stifle her cries.

Her fingers were nothing compared to the sheer mass of Rin’s cock, but with each thrust, she could imagine the blinding pain and pleasure of that terrifying thing rearranging her guts. Her climax approached rapidly, and she could see clearly in her mind Rin’s grapefruit-sized balls, brimming with seed -

“Kayo-chin?” Rin knocked on the door, making Hanayo jump. Her impending climax faded back down to nothing, replaced by mortification. She leapt to her feet, which proved to be a mistake as Rin turned the knob. It was unlocked. Rin poked her head in. “Are you…”

She trailed off, seeing Hanayo’s frazzled hair and wrinkled clothes. The spot on her shirt where she bit down was damp with saliva, and her finger was glistening with arousal. Hanayo’s mouth opened and closed, speechless.

Rin gaped, her eyes travelling up and down Hanayo’s body. Wordlessly, she stepped inside and shut the door behind her.

“S-someone…” Panic started to set in for Hanayo. “Someone save me…” She stepped back as Rin stepped forward. Her knees quivered.
After a few more moments of unbearable silence, Rin said, “Kayo-chin, were you…” She trailed off. Hanayo could plainly see her cock at half-mast, tenting her skirt. Even now, it was already imposing. Seeing it made those shameful fantasies flash through her mind all over again.

“U-um…” Hanayo stammered, feeling completely cornered. But once again, her eyes landed on Rin’s dick, then flitted to her nightstand. If she did this, there was no going back. “I-I have another present for you, Rin-chan.” Quickly, she strode to her drawer, pulling out an unassuming box. Her face now completely red, she backtracked and held it out to Rin with shaking hands.

Rin stared at it for a moment, obviously confused, but she took it and peeled off the single layer of tape. When she unearthed the pack of zip-ties from the box, the confusion on her face only mounted. She tilted her head, looking at Hanayo questioningly.

Hanayo swallowed the lump in her throat and closed the distance between them, locking Rin in a passionate kiss. Rin started, dropping the box to the floor, but returned the favor, and they swapped spit for several moments. Hanayo tugged aggressively at Rin’s clothes. Rin didn’t protest, letting them fall to the floor, and her underwear followed suit. Her huge cock swung around, pressing against Hanayo’s stomach. Hanayo sighed, feeling the slight heat that emanated from it, and she stepped back, admiring its incredible length and the hefty balls Rin had to match. With how large they were, it was a small feat that Rin could walk normally when she was this hung. 

Hanayo took the moment to undress a little, slipping out of her own skirt and panties in one motion. With only her shirt on, she watched Rin stare shamelessly at her. Now, with Rin’s attention completely on her, it was a good time to ask. “Rin-chan, does Maki-chan feel that good?”

Rin’s mouth fell open. Her cheeks flooded with color. “U-Uh…” she stammered, flailing about. It was somewhat cute.

“It’s okay, I’m not mad.”

At Hanayo’s gentle urging, Rin nodded.

Hanayo stepped forward. She gripped Rin’s dick at the base, though with one hand, she couldn’t wrap her fingers around it completely. 

“Does Maki-chan like it when you’re rough with her?” She stroked it gently, feeling it pulsate in her hand.

Rin nodded again, her hips twitching at the stimulation.
 
“Does she like it when you fill her up? To the brim?” The crude language felt strange on Hanayo’s tongue, but she knew it was necessary to get what she wanted out of Rin.

“Mmm… Yes…” Rin sighed. Her cock slowly raised to full mast. Hanayo gaped, watching it come between their bodies, extending all the way up Rin’s torso to her neck. It should have been impossible for Maki to take this, all the more so for Hanayo herself. But Hanayo pushed these thoughts away, and bent down ever so slightly to give the head a light kiss.

“Can you do that to me too, Rin-chan?” Hanayo pressed her huge breasts into Rin’s dick, and Rin moaned a little louder as Hanayo swirled her tongue around the head.

“You want to do it with me, Kayo-chin?”

“Of course.” Hanayo said with more resolve than she felt. “I’m sorry I haven’t been tending to your needs, Rin-chan…”

“It’s okay…” Rin bucked her hips up again, so the head of her dick nudged Hanayo’s chin. “I’m just glad you see me that way, nya…”

Hanayo nodded and stepped back once more. They took in the sight of each other’s bodies. Hanayo was entranced by the way Rin’s dick and balls swayed with every minute movement. “This is my first time, so I’d like to set the pace. Is that okay?” Hanayo stooped over and took a single zip-tie from the box. Rin got the hint and nodded, moving to lie down on the bed. Even now, with her lying down and Hanayo standing over her, her dick reached far up to press against Hanayo’s breasts. She still couldn’t understand how that would fit inside of her, but she’d do her absolute best to make sure it did.

Hanayo straddled Rin’s dick. She hardly even had to kneel to feel Rin’s dick pressing against her entrance - upright like this, it reached so far up that it nearly equaled the length of Hanayo’s leg. Along with its considerable girth, Hanayo knew this would be close to having an entire arm shoved up inside of her. She shuddered, a mix of fear and arousal. Putting that aside for a moment, she held up the zip-tie and Rin held her hands out, letting herself be tied up.

“I want to feel good with this too, Rin-chan,” Hanayo assured her, caressing the crest of Rin’s hands.

“A-are you sure about this, Kayo-chin?” Rin breathed. She squirmed against her makeshift restraints. “I don’t want to hurt you.”

“It’s okay, Rin-chan.” Hanayo smiled warmly. “I want to feel connected with you. All of you.” She took off her shirt, letting her mountainous breasts swing free.

Rin gawked at Hanayo’s massive breasts, swaying slightly with her every movement. The tip of her enormous cock pressed against Hanayo’s lower lips, but she didn’t nudge her hips upward. Hanayo had to use both hands to align Rin’s dick with her snatch. Even now, before penetration, she could feel the incredible width spreading apart her labia. She had no idea how it would feel once inside, how her pussy would be stretched to its absolute limits, and possibly even beyond that. But she wanted that absurdly massive cock to destroy every inch of her insides. She wanted to feel how Maki felt. She locked eyes with Rin, hoping she could communicate her desire to see and feel this through. Rin nodded, her modest chest heaving in anticipation.

Hanayo sucked in a breath and lowered herself. Rin’s dick spread her apart with a lewd noise, and it entered her easier than she thought. Of course, it wasn’t easy by any definition, simply not impossible. Hanayo felt her inner walls, slick with arousal as they were, stretching out to their very limits, as Rin’s incredible girth forced them apart. Still, her pussy clung to Rin’s dick, coating it in her juices as she gradually took more and more. Even now, with almost all of it still outside, Hanayo could trace the progress of the bulge in her stomach, protruding farther and farther up the farther down she impaled herself.

The further she sank down, the more she lost her grip on reason; namely, her disbelief at taking this monster was stamped out, replaced with the singular, overwhelming amount of dick that she was being stuffed with. Rin sighed underneath her, her eyes glued to the fat bulge in Hanayo’s stomach. Hanayo gritted her teeth. Her pussy was stretched so far apart, yet it clung like a vice to the massive insertion.
 More than half of it was inside of her, but there was still so, so much left to take. But with about 20 centimeters to go, the sizable head of Rin’s cock bumped against her cervix, making both of them shudder. Hanayo’s progress ground to a halt. Her chest heaved and her breasts bounced up and down. She didn’t want to move too fast, for fear of this absurdly large cock breaking her even more than it already did; right now, impaled with 40 centimeters of dick, she could see just how far up Rin was inside of her.

“Are you okay, Kayo-chin?” Rin breathed. Hanayo followed her eyes to the cock-shaped bulge in her stomach. She traced it with her own hands, feeling, and even seeing, how it twitched slightly even at this dulled contact through her skin. Curious, she gripped the protrusion harder, stroking it up and down, and Rin gasped, bucking her hips and grinding against Hanayo’s cervix. Her massive balls swung around as well. Hanayo responded by jerking even harder, feeling how her pussy massaged every minute movement of Rin’s dick. Lustful exhales escaped Rin’s open mouth, and Hanayo rocked her hips in time with her strokes, careful not to take any more.

“I’m going to start moving, Rin-chan.” When Rin nodded frantically, Hanayo raised her hips at a deliberate pace, bending over and placing her hands on Rin’s torso to steady herself. She felt her pussy clinging desperately to Rin’s cock, and she knew without looking that it was slick with her juices. She felt strangely empty, not being stuffed with that towering, hulking mass of dick. So when she sank back down, faster than last time, it knocked roughly against the entrance to her womb again, and she cried out, wanting to feel that absurd rush again.

Hanayo started to ride Rin with more abandon, caring not for how far apart she was spread, how this insane thing was fitting inside her with ease, or how her insides were being rearranged every time she ground her hips down. In fact, these served only to form one thought in her head:

Why didn’t I do this sooner?

“K-Kayo-chin…” Rin murmured, her eyes glassy and unfocused. “You feel so good…” Her eyes flitted from Hanayo’s massive swinging breasts to the unbelievable cock bulge that extended up and past her belly button. She could swear that Hanayo was taking more and more of her with each thrust, but she wasn’t sure.

Hanayo, however, was sure, because she felt her battered cervix give way with every aggressive thrust.This, of course, shouldn’t have been possible, she was far past the point of caring, even with the searing pain this sent through her core. All that mattered was how compatible she and Rin were, how Rin’s glorious cock split her right down the middle and throbbed needily inside her, close to delivering its vast payload right where she wanted it.

Rin’s eyes started to roll back into her head. Almost every single centimeter of her dick disappeared inside Hanayo at this point, choking her dick with a primal pleasure she’d only felt with Maki. “I’m gonna cum, Kayo-chin…” she warned, giving one, powerful thrust before her cock started to twitch, making her large balls swing along with it. This coincided with Hanayo impaling herself once more, with more force than ever, and her last defense from her womb fell. Rin’s towering cock rammed clean through her cervix, hooking itself inside her womb. The resulting bulge poked right through the gap between Hanayo’s breasts, and finally, Hanayo felt her hips collide with Rin’s own. She hardly felt this in comparison with her cervix being penetrated, and she bit down on her lip so hard she almost drew blood. Her body spasmed, a powerful climax rocking her body.

Then, Rin came.

The nerves all up and down her massive cock flared, shooting hot, thick cum directly into Hanayo’s womb. The torrent of seed filled Hanayo in a matter of seconds, but of course, Rin was intent on emptying every last drop of cum inside of her. Her stomach began to expand, her womb fighting against the skin from underneath as it was forced to swell due to the ridiculous amount of cum Rin was spurting inside of her. Hanayo threw her head back, any potential words stolen from her by the overwhelming warmth that flooded her womb. Her own orgasm was aided by Rin’s, and they came together, pathetic whimpers and ghosts of cries emitting from both of them. Through it all, even as the seconds turned into minutes, Rin continued to fill her up, her heavily bloated stomach stretching out absurdly far from her body and sitting atop Rin’s own torso. She looked heavily pregnant, yet the only thing inside her was liters and liters of Rin’s potent seed.
Finally, after a few minutes which seemed like an eternity, Rin’s orgasm subsided. Still, she remained rock hard, and Hanayo’s cervix remained as a vicegrip around her cock. That bulge was completely invisible now, overtaken by the insane amount of cum that now swam inside Hanayo, ballooning her stomach out to unbelievable proportions.

Hanayo herself came down from her orgasm, though she could hardly form any coherent thoughts as to what just happened. Refocusing, yet not daring to move an inch, she cringed at the sight of her expanded stomach, filled to the brim. She ran a tender hand along its diameter, feeling how taut her skin was. Moving after this would be difficult, if not impossible - she could feel all that cum inside her weighing her down even from this position.

They sat there in the afterglow, enjoying the silence. Hanayo ran her hands across the plane of her bloated stomach, with Rin watching her from underneath. She felt so warm, so full. She could get used to this.

“Sorry Rin-chan…” she whispered, her voice hoarse. “I don’t think I can move for a bit.”

“It’s okay, nya…” Rin nodded, embarrassed.

“I hope you enjoyed your birthday today.”

“I did!” Rin nodded, trying to gesture with her tied hands. Failing to do so, she and Hanayo shared a quiet laugh. It was difficult for Hanayo to even do this, as the slightest motion dislodged the liters of cum swimming inside her womb. She didn’t feel much of it escaping at this point, if at all.

“I’ll untie you when I can move, but… We should do this again sometime.”

Rin nodded, and even amongst all the other sensations, Hanayo could feel her dick twitch inside her. 

“Um…” Hanayo blushed. “When I’m ready to go again.” They shared another laugh, before returning to silence. Hanayo wanted to bask in the warmth of her inflated stomach for as long as possible.