"I'll take the Pegasus one," your girlfriend said and the attendant gave her the cup. She drank it all in one gulp and she looked over at you with a smile as she stroked your mane. "Come on, it'll be okay, at least we'll still be together right?"
You neighed a little and nuzzled your girlfriend a little before she backed off and started pulling off her clothes so you could see her transformation begin. She surprised you when she moved down between your legs and rubbed your sheath, you let out a surprised whinny but you could feel your cock sliding out of its hiding place as she took the tip of it into her mouth and started sucking at it.
You whinnied and looked over at the attendant who just smirked as your girlfriend worked her magic and licked and sucked at your cock. She hadn't normally done this which was a shame because it felt really good as she licked and sucked more, taking as much of your cock into her mouth as she could. She did this for a few minutes before she pulled away and you whinnied in protest as she got out from under you and a smell hit your nose as her pheremones hit you.
She was now on all fours and in mid-transformation. Fur was coating her body with stubby wings and a tail had already formed that was to the side to reveal her transformed vagina as it winked at you. She looked back at you and nodded and let out a sound that sounded halfway between go on and a whinny.
You didn't need any further motivation, you were already horny (pun not intended) from the blowjob cut short. You mounted her and pressed your cock against her vagina for a moment before you thrust deep into her as she neighed loudly and you thrust into her faster and deeper as she started to move with your thrusts, her flanks rubbing against you.
The feeling of animal mating was strangely exhilarating even more the second time. You had a lot more control over your thrusts and instincts this time and you were loving it as you thrust faster and deeper into her. You could actually feel her vagina growing larger as you thrusted faster and deeper and she let out more whinnies and neighs as she enjoyed the feeling.
For a moment you felt the feeling of feathers tickling your belly as you thrusted faster and deeper. You were already aroused and after one more thrust your cock stiffened as you blew your load into your girlfriend. Her vaginal muscles clamped down on you and squeezed your cock as more semen was drawn out of it.
You neighed and dismounted your girlfriend, she had been turned into a beautiful gold furred Pegasus mare that ruffled her wings and nuzzled you gently.
"Very good, now we just need a Pegasus stallion and we're all set," the attendant's voice said, but as you turned you were surprised to see that she was...