It had been a long and exhausting Friday for Dylan. He had been called in to his job to cover some callouts which, of course, they put him on the hardest station during their lunch rush. He opened the door to his flat and made his way over to the kitchen to begin his relaxing weekend off. He pulled out a coffee mug and a kettle as he began brewing a nice, aromatic dark roast on the stove and opened the fridge to find some creamer. “Damnit Zach.” Dylan sighed in frustration as he took inventory of the fridge which was brimming with containers of variously colored liquids. Zach was Dylan’s ‘freelance alchemist’ flatmate who he had moved in with when he could no longer afford rent by himself due to ever-increasing rental fees. Dylan didn’t hate living with Zach, in fact, he was a pretty chill dude despite his more scatterbrained and work-centric behaviors.

Dylan dug through the fridge and eventually found something that looked like his half and half creamer and added it to his coffee. He grabbed the edge of the countertop and clenched his arm around his stomach as it gurgled and ached, the warmth from his drink began spreading over his body as the potion he unwittingly drank began changing his body. The warmth turned to a dull tingling as his skin smoothened out and his muscles began burning away. His scalp and legs began to itch as patchy and thick fur began growing from his skin, the scratchy feeling on his scalp was replaced with a sharp pain as two horns sprouted from the side of his head. Next a dull pressure was felt at the end of his tailbone as a long tail with a ball of black fur sprouted out of his swelling backside. His hips, thighs, and ass slowly inflated until his jeans gave out and gave view of his thick and doughy rear. His now tree trunk sized thighs rubbed against his erect and throbbing dick as it and his testicles retreated back into his groin and were replaced with a quivering and moist slit. Dylan’s arm shook as he tried to hold his body upright as a slow and pulsating heat began radiating in his chest.

“Agh~ What now?” She uttered out in her now feminine voice as her breasts ballooned outwards, growing larger and larger in tandem with the pulsating sensation. Her nipples and areolas matched as with each pulse her tits swole, her nipples hardened and grew more erect, and her areolas stretched to cover the tip of her swelling teats. They quickly reached down to her belly button as her shirt stretched taut over them, trying to contain the waves of growth. “No more…” Dylan pleaded as she felt her shirt become tighter and tighter making it hard to breathe. With one last pulse her shirt gave way which forced her to cup her hands underneath her breasts so she wasn’t dragged down to the floor. “Why do they still feel so warm?” Her question was answered as the warmth built up behind her nipples as they began to leak a constant flow of sweet and warm breast milk. “Agh- fuck!”

With shaky arms she raised herself up so she was standing and took inventory of the changes to her body. Her first few steps felt uneasy as she got used to her shifted center of mass. Each step swayed her baby-bearing hips, her ass jiggled, and despite using her hands to contain them her breasts bounced and swayed as they leaked milk onto the cold tiled floor. “Why did I move in with a scatterbrained alchemist? I’m a fucking wet dream cowgirl now!” She stamped her foot which sent another wave of jiggles through her body. She could swear she felt her breasts slowly becoming heavier and bigger, the skin becoming more taut and tender as her nipples ached more and more. “Zaaaaach! ZACH!” She stumbled her way to her flatmate’s room and flung the door open. “Zach!”

“Hey!” Zach spun around in his chair to face the door, “Wait… who are you?” He was already a pretty small guy but he timidly shrank down into his chair as the very angry and nude stranger barged into his room.

“It’s me you fucking idiot! Why are you storing your potions in the fucking fridge!?” Dylan let go of her breasts as she waived her hands around and shouted at Zach. They dropped down to below her navel and swung against his belly as her milk dribbled down onto the carpet.

“Dylan? How did you-? Wha-?” Zach stared in disbelief as his mind slowly put everything together. “Why did you drink one of my potions? They weren’t done yet. They’re still unstable!” He got out of his seat as he approached Dylan.

“Why the fuck were you storing them in the fridge! Look at what you did to me!” Dylan reached down and grabbed one of her swollen tits, the added pressure of her hand caused it to shoot a stream of milk across the room. “You need to fix this!”

Zach hadn’t been paying attention to his flatmate’s tantrum as he was more interested in seeing the results of his work as he circled Dylan. “That potion wasn’t stable yet… this is interesting…”

“Zach!” Dylan shouted at his flatmate as his face became flushed with embarrassment. “Stop ogling me and fix this!”

“I don’t know if I can Dylan,” Zach reached out and grabbed her tail, “That batch needed to be chilled for another couple of days I mean… they’re unstable I-” 

“I don’t want your excuses! I-” Her face was a deep and bright red as she pulled her tail away from Zach. She turned her head away from Zach and softly said, “Can you at least help me right now they’re… they’re swollen and it’s the least you can do because it’s your fault and they’re leaking and-” She moaned loudly as Zach had walked behind her and roughly grabbed her swollen teats, causing them to gush out a stream of cream. “Nngghhh~ Not so rough…” she pathetically moaned. “It’s embarrassing!”

Zach slowly kneaded her breasts as she moaned and grinded her massive ass on him, “Is this helping?” 

“Yeah but…” Dylan had her eyes closed as she continued to grind on her flatmate, “are breasts supposed- AGGH~ supposed to be this- NNGGgghhh~ sensitive?” 

-----------------------------------------------------------------------------------------------------------------------------

It had been 3 months since the accident and, unfortunately for Dylan, her changes had only worsened over time. In the first month Zach did some tests on Dylan and quickly found out that her changes were permanent because the potion she had taken was unstable and any attempts to undo them would risk further unknown side effects. Zach did feel bad about what happened and had been helping Dylan relieve her over productive breasts and even talked her into selling her breast milk to those who couldn’t breastfeed which was lucrative enough for Dylan to quit her job. Though they’d both had adapted to the changes, Dylan continued to experience some unfortunate lingering effects from the potion as her breasts and milk production were still slowly increasing. It all came to head when Dylan walked into Zach’s room one day wearing a wet, milk-stained, XXL Shirt that couldn’t cover her nipples anymore, as her nipples gushed out an endless stream of milk…

Zach got up from the kitchen having just finished his breakfast with a fresh glass of warm milk. He rinsed off his dishes and put them into the dishwasher for later before heading to his flatmate's room. He knocked twice on the bedroom door and let himself in to check on Dylan who was right where he had left her. Dylan was facing towards the door, bent over a metal rod which her hands were restrained to via leather cuffs. She hadn't noticed Zach entering the room as she was blindfolded and was currently moaning and pleading into a large ball gag that was strapped around her head. Her breasts that now easily filled her lap were gently swaying beneath her as two large pumps worked overtime suckling her can sized nipples.

Zach walked behind the still unaware cowgirl and playfully smacked her shaking ass. She yelped as she was alerted to his presence. “Lema ga (Let me go)!” Her speech was muffled by the gag stuffed between her lips. “Isp bem weepsh mow, ips pu muf (It’s been weeks now, it’s too much)!” She squirmed against her restraints as she attempted to free herself which caused her to sway her rear in a provocative manner.

“How’s my little cowgirl doing?” Zach began rubbing her ass as he ignored her muffled and incomprehensible speech. “At this rate you’ll be milked dry in just a few more days!” He gave her swaying ass another, now rougher, slap which sent it rippling. 

Dylan moaned into her gag, “Schop hibbing ne! Ifp hurs! (Stop hitting me! It hurts!)” She squirmed harder against her restraints, exaggerating her movements as she hoped Zach would get the hint that she wanted out. 

“Man, you are energetic today! Watch that ass go.” He gave it another hard slap which caused Dylan to yelp and shout muffled insults his way. “I think I know what you want. Hold on for just a moment.” Zach walked over to a cabinet and began rummaging through its contents.

“Oshu nair (Don’t you dare)!”

“Aha! Found it!” Zach exclaimed as he pulled out a large and bright green butt plug and began walking back over to Dylan who was now thrashing against her bonds. Zach took her violent swaying of her hypnotizing rear as an invitation and without much mercy rammed it into her ass.

“NNNGGHhh!”

“Don’t worry it’s your favorite one.” Zach flipped a switch and turned on the now vibrating butt plug and gave Dylan’s ass one more playful pat. “I’m heading out of town for a bit to procure some rare reagents so hopefully when I get back you’ll be dry.” Zach walked around Dylan’s who was now hanging limp from the metal rod and trembling as the sensation of being milked and having her ass assaulted had spiraled her into an intense orgasm. “Don’t have too much fun!”