義理の妹が英語の宿題をしている間、私は義理の妹の隣で自慰行為をしました

This day I came from the party, I hadn't been able to go with the cute boy I met so I was horny, I don't know why I started touching myself in my stepsister's room but I couldn't stop myself, the adrenaline that he could discover me it made me very horny.