This story contains muscle growth, autofellatio, cum inflation, penis growth, and size growth.
Lee is from Arknights.
Thumbnail features art by Kuroblood.

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A slow day at the detective agency. So painfully slow, so agonizingly boring...
But at least this gives Lee a chance to wear a more casual outfit, knowing he won't have to attend to much at all.
Everyone but him was out doing whatever they pleased, making Lee wonder what the heck he was even doing here. Oh, right. It's his job. Ugh.

To his left, a mug full of tea sit on his desk. Aak begged and pleaded for him to try a particular kind, one he had never heard of before. It was steeped with... Something called Bufflate? Sounds a lot like Buff-Inflate. Odd.
Having nothing to do, Lee subscribes to fully taking in the experience. Analyzing the aroma, dissecting the taste, everything.

"A strong smell... It's almost cola-like. It brings to mind medicinal thoughts, but ones of comfort. Knowing you're being taken care of, and not that you're sick."

Having over-analyzed the scent profile, he finally goes in for a taste.
His tastebuds tingle, almost popping out of their sockets at the strength of the flavor. It tastes as it smells, much like you were to take a three kola nuts and eat them raw. To have the experience of a soft drink flavor profile in a tea is strange, to put it one way. But...

"Hmmm... How fascinating. It demands your attention every second after it passes your lips. Strong, but not overbearing. Hearty and robust. I could even describe it as being a muscular profile..."

Lee poises to put the mug back down on his desk, but stops himself partway through.

"I find myself wanting... No, NEEDING more. I should pace myself, but it's not as though I'd be chastised for doing otherwise."

He slowly pulls it back up to his face and drinks more, a bigger gulp this time.

"Oooohhh... That's gooood... It almost takes my breath away when I swallow it. What a demanding presence."

Oddly, he finds his white button-up shirt to be a little tighter than before. Could he simply be a little bloated? Perhaps. But after only two swigs of tea? That seems unlikely...

"I... I can't help myself. I need more."

Lee raises the mug once more, for two entire seconds. He's practically gulping it without even savoring the taste by this point.
A swirling, warming feeling fills his chest. His arms feel tingly, his legs feel hot...
He cannot help but start huffing and panting, as if short on breath.

"Hnnggg... How addictive. I can hardly think straight... Uff..."

*PING*

Suddenly the middle button of his shirt pops off and goes flying, bouncing off the wall and hitting the floor. Lee looks down in shock, to see that his once modest chest had ballooned out into a set of fat pecs. In fact, his arms had fattened much the same, defined and muscular where they once weren't. He quickly puts the mug down and feels his arms, shocked by how hard they felt and how bulky they looked...
He flexes his left bicep, tearing his sleeve clean open and bulging it out like a mountain peak.

"W-What has happened to me...?! I'm so... Swollen."

Lee glances back at the mug, and finds his vision fixed on it for several seconds.
In half a second, he grabs it and forces what remains of its contents down his gullet.

*Gulp...*
*Gulp...*
*Gulp...*

He slams it back down on the desk when finished, leaving a small dent in the wood owing to his new strength.
Hunched over, he grits his teeth and curls up his fingers, feeling a surge of that warmth returning.
His back muscles grow bulkier in real time, further ripping open his white shirt. His shoulders round out and push out, tightening the grip of the sleeves around his arms. His biceps look more and more like they're being flexed, but are in actuality growing bigger and bigger. The sounds of his skin stretching, fabric tearing, and his own heavy breathing drive the mania further into his head.
His belt snaps open, much as the fly of his jeans do in sequence. His legs were growing more muscular and defined, and his package was expanding to fit. His underwear felt vacuum-sealed to his body, tighter than anything he had ever felt in his life.
Unable to bear it anymore, he stands up in a very sudden movement, sending the wheeled chair flying back. He puffs out his chest even further, popping open what buttons remain at the top of his shirt. He leans back and raises his arms, allowing his bulging abs to break free and destroy the final few buttons keeping his shirt together.
He looks like a bodybuilder, devoted so intently to his craft that he has worked on his body every day for 10 years. Hefty pecs could give even well-endowed women a run for their money in chest size. He had very little in the rear before this, but now, his glutes combined with his bulge were stressing his underwear to well beyond their limits. His jeans were littered with tears and rips, and even his shoes felt tighter than before.
Hunched over like a beast, a monster, breathing heavy enough to be heard a mile away.

"I need... More..."

Suddenly, a memory erupts. Aak had made an entire pitcher, not just one mug's worth. If one mug did *this* to him, what would the pitcher do...?
Struggling with doorways, he navigates himself to the fridge that held his prize. But, first...

"I've gone too far. I see no reason to feign modesty anymore."

As best he can without further damaging his garments, he removes each and every article of clothing from his body. Now, nothing would hold him back. Even if he had to walk around with his member fully exposed, looking much, much bigger than before...
He grabs hold of the tea pitcher, and proceeds to inhale over half of the fluid content directly into his stomach.

*GLUG!*
*GLUG!*
*GLUG!*

He stops himself before it's all gone, trying to retain some level of restraint.
Immediately, a burning overtakes his body. The same kind of burning you get during an intense workout. Not painful burning, but growing burning.
The skin of his chest stretches and groans as his pecs balloon even further out from his body, fattening and rounding out to eventually become the size of his whole body as it was before the growth. Each.
His shoulders broaden and widen, surging with size in pulses. Left, BWUMPH! Right, FWOUMPH! His body is shaking, shuddering in pleasure.
His arms thicken to such a degree that they'd put tree stumps to shame. His biceps and triceps combined easily dwarf an entire *person*. His hips had widened much like his shoulders, almost making him look voluptuous. His glutes did not help, giving him a clear hourglass figure of muscle.
And, lastly... His package.
His balls slowly became tankers, churning and bloating like water balloons. His rod, in addition to staying at full mast the entire time, lengthened and fattened. It was just as long as he was tall now, and his whole body was gaining height to accommodate. He was, well and truly, hung. Precum drips and leaks like a broken faucet, begging to be touched.

As the growth slowly continues but tapers off, his desire becomes carnal. From standing, he falls onto his back, causing an erupting THUD to resonate throughout the agency. Not that anyone was present to hear it, of course. He coaxes his rod into his hands, wedging it firmly between his breasts. It easily reaches his face, giving him a devious idea.
As best he can, he places his mouth over the tip, giving himself fellatio. As his enormous arms stroke up and down, pleasuring himself with the combined pressure of his pecs sandwiching his rod. The precum fountains into his mouth, to which he swallows each and every drop. Grunts and sighs exit his maw as he proceeds, sounding like a struggle, but feeling like heaven.
He finally speeds up, intent on ending this dream scenario in a bang. He begins to move his hips to push his rod forward and back, essentially giving himself a titjob and facefucking himself at the same time. He relents from stroking and begins to move his pecs up and down with his hands, preparing for the finale. At last, he feels it growing within the shaft, a torrent of white approaching with deadly velocity. And then...

*SPLURT!*
*SPLURT!*
*SPLURT!*

A tsunami of his own seed fills his mouth, and he ingests each and every load. It was even heartier than the tea, warming all the way down his throat. As it fills his gullet, his stomach begins to bloat, hiding his sizeable abs and rounding out like a balloon with a hose in it. Bigger, bigger, and bigger, it inflates and expands, resembling a water balloon more and more. Finally, he can take no more, allowing his member to fly out of his mouth and spray freely around him. Not much is left to give, but what does exit his rod paints the room in white. Lee... Is fried.

"Aghhhh... Huuhh..."

In a half-awake state, he takes both arms and grasps his belly, playing with it and feeling it. It sloshes and wobbles, uncharacteristic of the rest of his body. His figure is that which can only be described as extreme musclegut, enormous pecs and arms with an even bigger belly to match. Oh, it was heaven.

"I still have... Some left..."

That wasn't even the whole pitcher of tea. Just imagine if he drank the rest. But, because he relented, he can now do this all over again in the future!
...After he takes a long nap.

"That was... So god-damn hot..."