So turned on it hurts.

Sam seriously wanted to put his hands beneath the sheets and play with his sister's pussy.

But as they had promised each other that they would not abuse the situation of being in each other's bodies like that so he did his best to ignore it.

But if he knew what his sister was doing right now with some skank she had picked up in a bar and who he was doing right now on his office desk he would have stopped fighting her body's desires and just give it what it wanted.

But he didn't know so he just lay there in sexual frustration.