Upon hearing some strange sounds coming from your sister's room you go in to check on her and find her laying on the ground whining loudly on the floor. When she realizes that you're there you ask her what she is doing. Your sister, who has just gotten home from yet another terrible date, becomes even more overdramatic, complaining how every date she has had in at least a year has been horrible, and with this last one being so bad, she is just going to give up on trying to date. You joke around with her, telling her she is overreacting. She laughs and agrees. Even though she is upset she can't help but get into a better mood around you. Your sister stands up and goes on to talk about how amazing she looks tonight, showing off her flawless makeup and sexy dress while doing so, while also complaining that the effort basically went to waste since the guy she met up with was such a loser. Why can't any of these guys be like you? Handsome, smart, reliable. Or better yet, why can't she just be with you, she asks. And before you know it, your little sister steps forward and quickly kisses you on the lips. She immediately steps back and apologizes for having done it, but unable to stop herself she kisses you again. She admits to always having feelings for you. She admits that the reason why it never works out between her and those other guys is because she is always comparing them to you and they just can't measure up to how amazing you are. But, if you want, you can just forget all of this and things can go back to how they were. That's when you tell her that you also feel the same way. You have feelings for her, love her, the same way that she feels and loves you. She steps forward once again and gives you a long passionate kiss before asking you to get down on the floor with her. Once you are both sitting the kissing continues. Your sister has you feel how fast her heart is beating, how wet her pussy is. You are the only person who can make her body react like this. And she is so happy that she finally gets to be with you the way she always wanted to be. She is then pulling your rock hard cock out of your pants, playing with it before telling you just how bad she needs you to make love to her. So, she straddles your lap, positioning her dripping wet pussy right at the head of your cock before lowering herself down onto it. And it feels so amazing to finally be inside of your sister's wet, tight pussy like this. She bounces up and down on your cock while telling you that she has only ever cum before from masturbating to thoughts of you, never from sex, and that she knows this is going to be the first time she does have an orgasm from sex. She keeps on riding you for a bit until she tells you that she wants you to lay her down, right there on the floor and continue making love to her like that. You do exactly as your sister wants. You position yourself above her and begin to pound into her, absolutely loving the way she looks while she is writhing and moaning in pleasure underneath your body. This is the best sex either of you have ever had. Perhaps it's because it's ingrained into your shared DNA, how to pleasure one another, or maybe the two of you are just meant for each other. Either way, it feels fantastic making love to your little sister like this. When you both get closer to climax, you get even closer to her beautiful face so that when you two cum together you can see up close just how amazing she looks while her orgasming pussy gets filled with your cum.