私の義理の妹は彼女の部屋で彼女のパンティーで自慰行為をして私を驚かせます。

My stepsister discovers me when she enters her room and watches me masturbating with her underwear. When she realizes she complains to me why I do that, I seduce her and say that I like the smell of her underwear too much and I end up fucking her hard until she makes me run.