It's move in day for your sister. She's moving into your place and you're both actually excited for it. The two of you are close and even wing man each other so it's going to be straight parties and fucking for the two of you. Fast forward a few weeks, and both of you are growing increasingly frustrated with the realization that you guys might actually be cock blocking one another. No one seems to want to go back to a brother and sisters house. After a while, the tension seems to be building and both of you can't take it anymore. You need a release and now! Awkwardly at first you and your sister start fucking, but soon that awkwardness subsides and you both are in absolute pleasure of finally getting off and also it's quite hot that you two are fucking. You find out from your sister that she has a breeding kink while you two are still going at it, which you find weirdly hot. After fucking non stop for a while, your sister realizes that she hasn't gotten her cycle so she decides to take a pregnancy test...hopefully it's no big deal but you never know.