私は義理の妹と二人きりで、彼女がソファに横たわっているのを見るのを我慢できませんでした

My stepsister was resting on the sofa, and when I saw her lying down I had to put my hand on her and take advantage of her, thank goodness we were alone at home, after taking off her panties I couldn't go back, we ended up having passionate and very horny sex.