The next morning saw Mary crawling out of bed in a groggy state, hair dissheveled and stripped down to nothing, even her underwear and nursing bra discarded so that she could enjoy the feeling of cool air on her nude body. There was still lingering fatigue from the previous day's whirlwind of activity as she stood up in her room, the whole thing seeming surreal, distant, like a dream. But a look in the mirror, taking a moment to admire her silky cascades of blonde hair, her enrapturing eyes, the hypnotic enormity of her chest, even a new addition of curvature to her ass and thighs that had developed overnight - it all confirmed that everything had been real. Even now, she felt the call of the sea, the though of water upon scales drawing a smile to her perfect face. She was still a bombshell of a mermaid... one who was both full and starving. Hungry, yet full of milk, able to feel it sloshing in her gigantic chest.
Both of those were things she could take care of downstairs. With a spring to her step, she flung open the door to her room and marched right down, even humming a quiet little happy tune along the way. The previous day had been exciting beyond anything in her life, and even now that excitement persisted, filling her with a new zeist for everything, an unending sense of confidence and optimism that she supposed was befitting a beauty of the sea. Why not feel wonderful? She was drop-dead sexy, she had a whole other world to explore now, and she couldn't wait to show off to her roommate.
Literally, she couldn't wait - because as she bounded into the kitchen for breakfast, said roommate turned around just in time to get an eyeful.
Karima was as kind a roommate as Mary could have hoped for. A bright college student, and a health nut, obsessed with keeping fit; that obsession left her with a powerful and lithe body, more than making up for an ass and chest as flat as a plank. Mary found her beautiful in her own way. Nowhere near as beautiful as the blonde, of course, who merely offered the shocked Karima a smile as she walked up, hands on her hips. "Hey Kari," she greeted her, voice low and sultry simply because that was what her natural tone had become. "Nice morning, isn't it?" She giggled, utterly soaking in the way Karima was staring at her - seemed like she'd developed a love of the limelight alongside everything else.
"W.. wha.... Mary?" A hand ran through her dark hair, her flat chest heaving up and down. "Y-you... I... what..." She was utterly confused, and the reddening of her cheeks betrayed something else. As far as Mary had been aware, Karima had never shown interest in girls... but she'd never seen anyone as breathtaking as a mermaid in their human form before, had they? Mary had never really experimented either, but right now, she found herself aroused by the washboard abs and thick biceps of her confused roommate. "What happened to you?!" The indian girl finally sputtered out.
Mary was all too happy to take a step forward as she explained. "Oh, sweetheart... you wouldn't believe me if I told you."
Karima bit her lip. "Well... I-I mean, you weren't... you weren't like this yesterday... so..." She let out a ragged breath, needing to lean back against the counter. "H-how is this even possible?! I-I mean... your hair... a-and your eyes... and... boobs... and... milk?"
A glance down affirmed that she was, in fact, dribbling a little bit out of one nipple. With a smirk she reached one finger down, wiping up some of it and licking the sweet substance right off her finger. "Mmm. You're right." It was delicious. Like the sweetest thing she'd ever drank, sweeter than honey, and, she was certain, quite filling as well. Karima was, of course, shocked, mouth agape... and it was tood good an opportunity to pass up. With a mischevious flair, she hefted up one tit, squeezing just enough to send a spurt of milk directly into the young woman's mouth.
She reeled back, but swallowed, gagging it down in surprise. For a second, she was trying to cough the stuff back up.... but after a moment, this effort ceased. Her eyes somehow seemed to grow wider as she looked up at Mary, still confused, but now growing even more aroused. "T-that... that was... it..." Her jaw shifted. "Really... good..."
Interesting. Mary paused for a moment, considering the implications. Her milk wasn't just delicious - it was magically so, going by how quickly Karima's dark eyes had started to glaze over in arousal. Her roommate had been effectively calmed from her concern by the little spurt, and now was staring at Mary's breast... and who was she to deny a friend? "Go on," Mary cooed, "Drink up."
Karima needed no further urging. She pounced, lips locking around Mary's enlarged breast, teeth clamping down and fighting to squeeze out the bounty within. The sudden attack drew a moan of surprised delight from Mary, the shock of arousal causing her to stumble back, losing her footing as her own feat betrayed her. With such a wave of sexual excitement, her body ached to be in its true form; Karima kept suckling as she was dragged to the floor, Mary's glorious tail sprouting in place of legs and wrapping around the other woman's body, holding her close as hands felt up the other woman's taut muscles.
The milk was flowing freely now, rushing from her nipples into Karima's eager mouth as she started going back and forth, rotating between breasts. She was so very desperate for every droplet, so much so that, after a few minutes of driving Mary wild with her ministrations, she could no longer suffice on one breast. She raised up, hands latching each one one of Mary's tits, and squeezed down, sending out the spray from both into her mouth at once.
In this position, Mary could look up at her lover, and found herself delighted as she watched Karima begin to experience her own changes. The beautiful girl was no longer flat-chested - her bust was bulging out, straining against her sports bra, gaining mass by the second. An effect of the milk, Mary surmised, as she felt those hips flaring out within the grasp of her coiled tail. She flicked to put her tailfin between Karima's legs, only to find skin fusing them together. Her heart began to pound with joy as she realized Karima was becoming like her.
Not just like her, though. She could feel scales begin to appear, rubbing against Mary's own as legs gave way to a tail... but there was more happening. Karima's sports bra melted away, not replaced with seashells or anything similar as Mary's bra had been, allowing two utterly titantic breasts to spill out. They stopped only upon equaling Mary's bust in size, but that was not the end of the growth - right beneath the now enormous chest, another began to form, nipples poking out at the front of what swelled into another pair of equally enormous tits. All four were leaking, dribbling out with Karima's own milk.
Her hair darkened, spilling out to become much longer, a midnight-black mane through which poked two fin-like ears. Their color was curious: splotches of alternating black and white. Even as she was further milked, Mary craned her head to see the same sort of coloration and pattern on Karima's tail. Her hands felt at the place where skin and scales blended, finding that the muscle was softening, becoming fat instead - she wasn't quite becoming overweight, but severe muscle was becoming welcoming softness befitting of a more docile creature.
Altogether, the hints pointed towards a hunch that was confirmed as two coral-like horns jutted out from Karima's forehead just in tune with orgasm. She finally fell back, moaning softly as Mary was able to get a full glimpse of what she'd become: a mermaid and cattle put together. A mercow, she supposed it was accurate to say. Just enough fat to be thicc and lovable, her face softened and welcoming, four massive udders constantly producing milk. Mary was uncertain if she could even return to a human state... but as her mind wandered to the portal, and blissful look on Karima's face, she began to feel certain the mercow no longer held interest in the surface world.