Instantly you feel more aggressive and start pumping visciously, you start to feel hot but ignore this. Eventualy you cum and pull out of him. But where you pull out of doesn't feel the same, you look at the male but he isn't there, instead there is a female.
"What happened?" you ask.
"When you came I was instantly changed into a female" he responds, "and you were changed into my mate."
You look over yourself and discover that she is correct.