Your sister calls you over late one night saying she needs someone to talk to. When you get there she is quite obviously upset about something. She confides in you that she thinks she is about to get a divorce from her husband. She says that their is no passion, no chemistry between her and her husband. In fact, she does not like having sex with him at all. She then tells you that her husband has never given her an orgasm before. He is the only man she has ever had sex with, so she doesn't have any basis of comparison, but she knows that sex has to be better than the sex she has with her husband. Your sister then asks for your advice on what she should do. You immediately tell her that you think she should try fucking someone else. She giggles at the idea, saying she has considered cheating on him before, but she doesn't know how to go about it. Where would she even find someone to cheat on him with? She asks if you have any ideas and you automatically say yourself. After all, is it really considering cheating if it's with your sibling? The idea excites her, fucking her own brother. But, your sister, being as shy as she is, is a bit timid. She giggles and blushes as she suggests that perhaps the two of you kiss first and see how that goes before you decide to take it even further. You and your sister kiss for the first time. Your sister tells you just how horny kissing you is getting her. She takes your hand and guides it towards her pussy, showing you just how wet you have gotten her. She then unzips your pants and begins to stroke you as you kiss a bit more until she decides she can't wait any longer and needs your hard cock inside of her. You lay down as the bed as your sister quickly undresses. She gets on top of you and lowers her tight, dripping wet pussy onto your cock. All of her timidness has gone away. She talks dirty to you as she rides your dick, also revealing that she has had a crush on your for a long time. It feels so good fucking your sister. It feels right. And she feels the same way. You eventually flip your sister over onto her back and pound into her, gradually building her up to her first real orgasm. She spreads and lifts her legs, grabbing on to them as she cums, bringing you to cum deep inside of her.