Your sister comes back from a night dancing and chills in the room with you as her friend calls her and they start chatting about the hot guys they were dancing with, she turns away and secretly starts playing with her pussy, thinking you wouldn't notice. The next day you show her a video you took of her masturbating and she tells you to delete it, calling you names and humiliating you for getting off to your own fucking sister! She decides to let you stick the tip of your cock in here pussy under the condition that you'll do whatever she wants for the next few months. She get's more and more disgusted by you, not showing any signs of pleasure but you can feel how wet her pussy is and how much she secretly loves it, She wants to tech you a lesson and get's on top riding your cock in reverse cowgirl and telling you if you cum inside her you have to eat it all. She pulls your cock out and tells you to jerk as she winks her asshole for you and lets you cum in your hand. If you're lucky, you'll get her asshole next time.