Pinky rolled around in his comfy home, totally bored. Brain was fed up with him after he accidentally knocked a beaker over and spilled its contents onto a chunk of cheese.

After he did that Brain stormed off in a fit of rage and Pinky hasn't seen him since. “Oh I hope Brain isn't too mad at me.” Pinky mumbled solemnly to himself, he really felt bad about ruining his plans again.

After a bit more time had passed Pinky heard his stomach growl and he rolled back onto his feet, stretching while he stood upright. “No need to starve myself, right?” Pinky said to himself again as he looked around the large room his cage was in.

When he saw the fridge across the room he excited ran towards it clearly not thinking and ran right into the cage bars with a loud metallic 'twang!'

Pinky shook his head as he felt back onto his feet, he stumbled about dizzily clearly disorientated. After a bit of fumbling about, Pinky found the door to the cage he was in.

However despite his best efforts Pinky wasn't able to get the door open before finally letting out a huff and saying, “Ohhhhh Brain normally unlocks the door for me! How am I supposed to get food now...”

Looking around sullenly the mouse couldn't help but notice a glow coming from the other side of the cage. Looking a bit scared but curious the white furred rodent quietly pattered over towards the glow.

When the mouse walked across the cage until he finally reached what was glowing, when he looked down at it he was surprised at what he found...

It was the cheese he spilled Brain's experiment on earlier!

“Oh thanks Brain! You're glowy light showed me the way to the food!” Brain naively yipped happily as he bent over and picked up the cheese, licking his lips as he drooled over it.

After holding the rather large piece of cheese for a few minutes, he was beginning to strain to hold the piece up. Pinky knew he had to put it down soon so he quickly ran over to the area where he slept.

He dropped it next to where he sleeps with a huff, “Oh Brain, we really to...” Pinky's voice faded out as he looked around only to remember that Brain wasn't around.

“Ohhhhhh...” Pinky sighed dramatically, missing his only friend. He looked over at the cheese and ripped off a piece.

However when he took a bite of the piece he was flabbergasted when the taste was something he had never experienced before, it was exhilarating and overwhelming. Pinky couldn't help but throw the whole rest of the piece he had in his hand right into his mouth, savouring the addictive taste the circulated throughout his mouth.

Quickly Pinky had ripped off another piece of the cheese block and devoured it, licking his lips trying to get as much of the taste as possible. It was definitely the experiment Brain was performing and accidentally messed up earlier that much of made this cheese taste so delicious.

As the mouse swallowed the piece of cheese in his mouth, he felt his stomach bulge out ever so slightly. Pinky looked down at his tummy as he rubbed his hand over it.

He gave a big smile as he reached over and tore off another piece of the cheese, the piece was a bit bigger this time as he forced the whole chunk into his maw.

The burst of flavour returns as he does, the sensation even stronger and more intense this time. He vigorously chewed on the chunk, every bite felt orgasmic as shutters between to surge throughout the lab mouse's body.

When he swallowed and felt the cheese hit into his stomach and the similar sensation within his stomach as it bulged out even more. Now the rodent was definitely chubbier as he turned slightly and fell on his back next to the now slightly smaller block of cheese.

Pinky stuck his fingers into his mouth one by one and suckled on them softly, the faintest taste of the cheese was still on them. After he licked off of them he let out a loud burp and stretched out, his belly showing even more prominently as his body lengthened.

Soon Pinky found himself dozing off as a way of exhaustion overwhelmed his body. His eyes were too heavy to keep open and they closed, his breathing becoming slow and deep as he fell into a quiet slumber.


“-ky...” A far away sound make Pinky stir slightly, his body twitching before he rolled over trying to get back to sleep.

“-inky.” The sound became clearly and the rodent noticed it was a voice and slowly became to awake, his body still trying to force the last moments of relaxation after such a filling meal.

“PINKY! WAKE UP!!!” Pinky suddenly jolted upwards as he heard a scream next to his ear, his eyes stop open as he tried to find the source of the terrifying noise.

The now chubbier male scouted the room before noticing the shorter more intelligent lab mouse had returned.

“Brain! You're back!” Pinky shot forward and lifted the tiny rodent into the air, hugging him tightly as he began to apologise. “Brain, I'm so sorry about before I-”

Pinky was suddenly cut off as Brain socked the larger mouse right in the nose causing the now chubby mouse yelp and drop the other rodent before grabbing his muzzle delicately, rubbing it as he left out a whimper of pain.

“I don't care about that, what I care about is THIS!” Brain poked Pinky's stomach roughly, the taller mouse felt rather embarrassed about his new found gut.

“Well, it's not that big I'm sure I can burn it off soon!” Pinky let out an innocent smile and a cute giggle as in response to Brain's serious face.

“No Pinky I don't mean that! I mean how did you get so much fat so fast?” Brain was genuinely confused by this and needed to know the answer, he wasn't going to settle for anything less right now.

“Uhh… Well I was eating the glowy piece of cheese an-” Pinky was beginning to start his explanation when Brain immediately cut him off when he heard about the cheese.

“WAIT! What do you mean glowing cheese?” Brain was suddenly really concerned. 'what exactly had Pinky found?' The short mouse couldn't help but think to himself.

Pinky looked a bit confused and a tiny bit disappointed in Brain right now as he looked to the right where his chuck of cheese sat only a few metres away. Pinky lifted his hand to point towards it, the confused look on his face unmoving.

Brain turned his head and saw the enhanced cheese before quickly returning his attention back to the now wider mouse and let out a cough, “Yes I knew that. Ahem so you're saying this cheese did this to you…? How?”

Pinky thought for a second before replying, “Uhhh it just did?” He gave out a goofy laugh before continuing, “I just found it where you were experimenting and when I ate it, it was delicious! I couldn't stop and it looks like I ate a bit too much hehe.”

Brain however was stupefied, he was just so confused by the implications here. “But… Even then you shouldn't of grown that big with how little has been ripped off of it.” As Brain whispered this ever so quietly to himself, suddenly an idea popped into his head as he realized that his experiment must of affected and altered the cheese.

Brain quickly ran over to the cheese and tried to lift it, after a complete failure he tried to push and pull it towards the taller rat but he wasn't able to make budge an inch. Frustrated, Brain just decided give up and call the other rodent over.

Pinky gladly trotted over to his only friend but was shocked and startled when Brain threw his body, shoulder first into Pinky's chest which knocked him over. “B-Brain! What are you doing?”

The stout mouse stood up over the dopey mouse, looking down cold and calculatingly. “It seems like our cheese here has been modified by the residue of our failed experiment and now seems to cause the one who devour it to gain in size. I need to investigate this further and you're going to be our guinea pig Pinky.”

“Um I don't know Brain, it's really good but I don't know about this.” Pinky suddenly felt very nervous by the way the much more intelligent male was looking at him. 

He began to sit up when Brain pressed his paw on his forehead and pressed him down to the floor, “Now now Pinky, we can't have you getting up. It' ll ruin the experiment." Brain replied as he started to tear a piece of the cheese away from the block.

Pinky's nervousness was dramatically increase as he felt the toes on his forehead tap as the smarter mouse methodically tore off a big chuck of the cheese before leaning down.

“B-Brain, I really don't kno-” Pinky was sharply cut off when Brain forced the cheese into his maw, stretch his jaw out from the sheer size of it.

Pinky bit down on the cheese and suddenly his body and mind was forced to experienced a huge internal conflict as the addicting flavour returned to rack his body with a familiar pleasurable sensation.

Brain let out a pleased smile as he saw Pinky swallow the last of the cheese in mouth, a shiver went up the taller rat's body and his stomach wobbled for a few second before visibly extending outwards.

“Fascinating!” Brain's eyes grew wide as he saw the effects first-hand however he quickly snapped out of his trance and quickly ripped off another piece of the cheese immediately pressing it into Pinky's mouth.

“Brai-MMFFHH!” Pinky tried to protest before his mouth was stuffed once against, he could only grumble out muffled responses before the wave of ecstasy hit his body once again. 

As the larger mouse swallowed all that was in his mouth, he couldn't help but let out a whimper. The whimper was cut short however as he let out a groan. His stomach pressing out even further, his gut pressing over his lower body as it extended out.

When Brain ripped off and tried to feed it to the mouse this time however, Pinky nervously but still consensually opened his mouth and accepted the piece of cheese.

This time when Pinky bit into the dairy product, he focused on the taste which filled up his mouth so potently. Spasms and twitches surged through his lower body, his legs briefly thrashed for a split second as the internal stimuli overwhelmed his body.

As Pinky swallowed the pieces, his toes curled as he felt the after-taste fill his mouth leaving him feeling used but satisfied. His stomach still pushing out a little bit with each piece, now looking fairly fat with only a quarter of the cheese left to eat.

This continued for a while, Brain feeding Pinky, Pinky squealing in ecstasy and growing in size.

Finally as the last piece of cheese was pushed into Pinky's open and waiting maw, Pinky knew it was the last piece and was going savour it. Pinky chewed even slower the rest, still his body still spasms and twitched in pleasure. The rolls now on the fat rodent's belly jiggling slightly as he did.

This time however Pinky rubbed the delicious cheese all over his tongue and the effect was immediately noticeable as the taller male's back arched involuntary and he let out a very whiny moan before finally swallowing the final piece.

Pinky's belly bulged one last time and Brain nodded contently, “Amazing results, good job Pinky.”

Pinky began to sit up, his body still receiving occasional twitches and shivers, the after effects of the cheese's over-stimulation of the body was still affecting it. The now fat rat finally gave up on trying to sit up and fell back onto the floor of the cage, resting his eyes before dozing off to sleep.

“Thanks Brain...”