You do.

He starts trying to fuck you harder. You growl at him. This is about you. It had fucking hurt before but now his huge cock is just about right. You reach between your legs with one clawed furry hand and play with your clit as you fuck him. It sends you over the edge and you cum. As you orgasm your body change back into a human. Sam is still a creature since he has not gotten off. He's still inside you and you no longer have the strength to control him.

He fucks you so hard you don't think your pussy will ever be the same again. You lay there as he fucks you, finally he pulls out and covers your naked body with his hot semen. He falls beside you and something in you loves and hates him. The next time you change you are afraid you just might kill him, but for now all you want to do is sleep...