Your sister notices that you aren't your happy self. She puts her book down to talk to you about what's going on. She is your family, after all. At first you don't want to tell her what is wrong because you are embarrassed. She figures it out that its because of your cunt wife. Your sister tells you how much she hates her and how you deserve someone better, like herself. Your wife has given you permission to fuck your sister, only because you have a small cock and it isn't worth her time to argue with it. But your sister loves your small cock. She talks about it over and over again. Your sister begs you to run away with her to start your own family. She sucks your small cock and eventually lets you fuck and cum inside of her!