You are startled to see an anthro Zebra stallion standing over by the bed. He is amazing looking, mostly Zebra but still fully humanoid. And he is spectacularly male, something made obvious by his lack of clothing. He chuckles and points to the boxers. "Those are mine, at least if I want to wear clothing. The bikini? Well, I think I can help make that fit you." He moves towards you.
You blink, confused for a moment, then understand. "You want to turn me into an anthro zebra girl?"
He nods. "Of course! Sex is way more fun with opposite sexes, and I'm already a stallion. Of course, I could always fuck you all the way into a full zebra mare, but that might change me all the way too." He is pounding erect. "Come on, sweetie. You are already starting to change."
Huh? You spin and run to the mirror. Sure enough, your ears are getting longer and your face looks broader and coarser. And your crotch is starting to feel odd.