私は彼女が彼女の新しいボーイフレンドと出かけるのと引き換えに私の義理の妹をお尻で激しくファックします。

My stepsister asks me for permission to let her go see her boyfriend, I'm jealous of her because she's the only one who can have sex with me, so I tell her that I'm letting her out in exchange for me making me cum in her ass, which she agrees to and earns permission.