Cow. After all, you've been nothing but a cow to so many people, and I bet you didnt even realise. But now you'll know just how much of one you really are.
That was the end of the letter. Jennifer laughed to herself. How ridiculous was this? As if some dumbass out there thought this would scare her into being nicer to everyone. She looked into the box and found a collar with a big, gold coloured cow bell on it. Wow, someone really went all out on this prank, she thought.
She decided to humour the gift, and took it over to the mirror, then wrapped it round her neck and clipped it on at the back. It actually fit surprisingly well. She gave the bell a little jiggle and found the ringing quite pleasant, sending a tingle through her body. Jennifer was done with it now though and reached round the back to unclip it again, but the clip was gone. The collar was just solid and joined all the way round.
She started to panic, and yanked at the collar causing the bell to ring more, making her body feel weird. She watched in horror as her perfect slim body began to fill out, stretching her leggings and tank top. Jennifer scrambled at the collar, trying to find some way to remove it, but it just made things worse.
She felt the back of her leggings tear near the top, and grabbed at it to feel a tail swiftly growing through the new hole. She stared at herself in the mirror as her hips kept widening, until they tore the leggings in two, separating at her crotch so that they only covered her legs. Her underwear was causing her a lot of pain, digging into her significantly larger waist and ass. Finally they gave in and snapped, falling to the ground.
Jennifer went back to focusing on the collar, hoping that all this would stop if she could get it off. The ringing of the bell persisted though, washing her over with a feeling of calm, until it wasn't caused by her panic to get it off, and instead she was ringing it herself on purpose.
With her non-ringing hand, she grabbed at her growing breasts, watching on as her tank top got pulled up her body, struggling to cover them. As she squeezed at them, wet patches appeared on the top, and within seconds both her hands were mashing at them, milking herself.
She shut her eyes in bliss, enjoying the sensation while the bell lightly jingled as she fumbled around.
"MoooOOOOO" forced itself out of her mouth, startling her eyes open. Looking in the mirror, her face now resembled a cow more than a human. Her face had stretched out, with a wide, pink nose at the end, floppy ears stuck out the side of her head and little horns emerged through her fringe.
Jennifer was horrified, but couldn't help feeling immensely turned on. One hand instinctively moved down to her pussy, already sopping wet. She gently caressed the outside, then plunged a finger in. Then two. Then four. Then her whole hand, sliding in and out of her enlarged pussy.
Still, she craved something bigger inside her, eyes darting around the room looking for something to impale herself on. Her eyes settled on the bed post next to her, and within seconds, she was standing over it, legs spread out, easing it inside her. Luckily it was a curved, rounded shape so within moments she was standing over it, bouncing herself up and down on top of it.
The bell jingled louder with her bouncing, letting her mind succumb more and more to the changes. Her feet quickly changed into hooves, and a light coating of fur moved up her body from there. Five minutes later and it was all over her body, besides a patch of pink skin at the bottom of her belly. Still she kept sliding up and down the bed post, her stronger thighs supporting her new weight magnificently. Finally she hit her orgasm and started mooing uncontrollably, unable to form words.
Once her hands turned into hooves, the change was almost complete. Jennifer slid herself off the bed post and looked at herself in the mirror, watching excitedly as the pink patch on her belly expanded outwards, four little nubs popping into existence as it grew. It didn't take long to fill itself with plenty of milk, and with that her transformation was over.
Jennifer looked out the window and stared into the garden, stomach growling.