You bounce up and down on his growing erection, not ignoring his changes but getting more and more excited by them. You stare into his terrified eyes as you feel your body build up, then in a wave of pleasure your body shudders in ecstasy.
You continue a bit longer, until the donkeys growing erection is just becoming too large for you, then climb off and lay down. The poor animal is laying on it's back on the bed, unable to move.
"Sorry, lover," you say. "I guess that wasn't as good for you as it was for me. But you'll enjoy the jenny's, I'm sure." It's not long after that a couple of staff members come in to take the confused donkey away.
You return to your room and recline on the chair. You've been a woman for all of a few hours, but you've turned two young men into farm animals. With sex. You should feel disgusted, but you don't. You feel... sexy. Delighted.
You stand up and look out the window. The midway under your hotel is full of young men, and you're still feeling full of vigor. You're also curious how it works. Are the men changing because of something you said or did? Is it random? Or are you filling an order for someone higher up?
You smile as you think of a way to test that out.