Your sister is grateful that you allowed her to come over. You can tell she is very stressed. She reveals to you that she and her husband have been trying to get pregnant. Clearly, her husband is the problem. She gets a little flirty as she tells you proposition. She wants you to get her pregnant. Of course, you are shocked as she takes out her tits. She then tells you that she knows all about you spying on her back in the day. From those incidents, it is why I want you to fill me up with your cum. I get more naked and can see your desire for me. I take our your cock and suck on it. I tell you to relax bro and let me do all the work. I get on top and ride you. I confess that I want us to have sex multiple times, even if you do knock me up this first time. I am enjoying your cock more than I thought I would, but I guess taboo desires makes sex feel extra good. I ride you until you cum in me. I take out your cock and you can see I creamed all over it. I lift my legs back to my chest so your cum stays in me. I hope we can do this again bro.