Γαμάω την ετεροθαλή αδερφή μου από κώλο με αντάλλαγμα να την αφήσω να βγει έξω με τον νέο της φίλο

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.