Caught! fucking my stepsister's husband!

Finally the time had come! And I had the chance to have my brother-in-law all to myself, as my stepsister was in town shopping. I didn't hesitate and took his cock out of my pants. My stepsister always raved about what a hot fucker he is and I wanted to test that out. After I had sucked his cock nice and hard, I slowly pushed it into my pussy. My stepsister was right. His rock-hard glans massaged my clit so much that I had one orgasm after another. But then suddenly my stepsister was standing at the window and caught us....