私は義理の妹が通話中に彼氏と話している間、激しくセックスします。

My beautiful stepsister has a new boyfriend, she is falling in love with him a lot, I am jealous of that guy, I don't know what plans he has and suddenly he wants to hurt her or hurt her, I try that when she is with him I always interrupt. This time she talks to him by call and I come to her room to warm her up and she ends up fucking me.