Ik neuk mijn stiefzus in haar kont in ruil dat ik haar laat gaan met haar nieuwe vriendje

My stepsister asks my permission to let her go see her boyfriend, I am jealous of her because she is the only one who can have sex with me, therefore I tell her that I will let her go out in exchange for her making me cum in her ass, which she agrees to and earns permission.