Needing more (transformation)

"Come on, harder! I want to feel something!"

"I'm doing my best here, bitch!"

Jane was riding the man's cock, but it didn't give her much pleasure. She needed more, she needed harder.

"Maybe try my ass!"

"You're really a crazy one!"

Pulling out his cock from her pussy, he pushed it in her ass. Which didn't give much resistance. It was as tight as her pussy and she barely felt anything in that hole too. While he ended up cumming in her ass, she wasn't close to get what she needed.

Feeling unsatisfied for too long, Jane took a risk and used a device from a friend that allows her to go into other worlds. But the risk was worth it. In that world, she found a creature called bullman, some sort of minotaur. And their cock... was massive. Jane finally found pleasure with that dick stretching her pussy and going deep in her vagina.

But there is a big side effect to mating with a bullman. As she came back, she realized how big her tits had grown. It didn't fit in her dress anymore, and her friend noticed it immediately.

"What did you do?!"

"Nothing much, I... I used your portal thingy..."

"Godammit, Jane, this is not safe at all. The travel and mating with creature from other worlds, changes you to fit theirs. Who knows what it'll do to you!"

"Shit, sorry, I should have asked you."

"It's ok, don't do this again."

But Jane couldn't stop, she loved the sex with the bullman too much. Having sex with a man again was a no go, anymore. So, she sneaked into her friend's lab again. She was addicted.

When he noticed the use of his device, her friend came to confront her, but it was too late. She was marked by her bull master, her body transformed with massive breasts and long thick teats, her pussy and ass stretched, she couldn't even talk properly.

"Hi... mooo... Sowy, I mooo not help... moo..."

"Jane, look at you! You're barely human, now!"

"I mooo... love his mmooo... soo moooo!"

"I'm sorry, but I can't keep you here, I could be in a lot of trouble if someone finds you. You have to leave to the world where you've been so often."

"Mmmoooo... YES!!"

Jane disappeared from our world, and became a breeding cow in the other, happy and horny.