"Wow, he looks good," a familiar voice said and you turned to see your girlfriend walking in with a smile. You tried to warn her but you wound up just letting out a whinny as she stroked your mane. "You were made into a very handsome Unicorn Stallion honey."
You tried to ask her what was going on but you just neighed and she giggled and patted your nose. The attendant smiled a little as she came back carrying two cups. "You see we're looking for Unicorns and Pegasi for our new mythical horses stable and your girlfriend was interested in joining it. Of course, she didn't want to leave you behind so we transformed you into a stallion as well."
"Yep, and you're sexy as one," your girlfriend said as she kissed your nose before she turned back to look at the attendant. "So, how is this going to work?"
"Well, you're going to have to pick either a Unicorn or a Pegasus," the attendant said as she held the two cups. "Then you have to mate with a stallion and allow him to finish so that the transformation is made permanent. There is also a chance you'll get pregnant as a result given that more often than not it sends you into heat."
"Alright," your girlfriend said and looked between the two. "I think I want to be a..."