Jon was dumbfounded by this request but decided to go ahead and see what it would be like.
He jumped into her bed, taking off his clothes as he went. He didn't quite know where to begin, but Zoe directed him to the general area of her vagina. Once Jon was fully erect, he entered his sister's blob of a body. He was kind of grossed out by her body, but as soon as he started pumping in and out of her, she started to regain her more human appearance. Seeing her transform like that into a beautiful young woman nearly made him come right there and then.
But he was able to hold off, and soon Zoe was in her usual busty form, and they were fucking like regular old bunnies.
