You and your younger sister have a... special bond. You guys have had an ongoing sexual relationship for years now, and have made a pact with each other to only fuck one another. One morning after your sister hungout with her friend, she comes into your room and says she needs to talk to you about something. Her best friend just left, and she told your sister that the two of you have been fucking behind her back! Your sister is pissed because you guys aren't supposed to be fucking anyone else, let alone her best friend?? That is so messed up! She tells you to take your cock out so she can jerk you off and remind you why she's the only one you should be having sex with. You accidently cum on her face very quickly because it turns you on that your little sis is so possessive of your cock. She gets even more mad that you would cum so fast right on her face when she wasn't even done with you yet. So she tells you she's not done with you, and proceeds to tit fuck your already sensitive cock until you blow a second load all over her tits. She then blows you all the while reminding you how much better your own sister is than any other girl. After you cum on her face and in her mouth she hops on your cock and rides you until she cums, then takes your cock out so you can cum all over her stomach and pussy, last she knows how much you love her ass, so she rides you reverse cowgirl until you cum a final time all over her ass. She lays down next to you and tells you she loves you, and then leaves to get ready for school.