Caught! fucking my stepsister's husband!

The time had finally come! And I had the chance to have my brother-in-law all to myself for once, as my stepsister was in town shopping. I didn't hesitate for long and took his cock out of my trousers. My stepsister always raved about what a hot fuck he was and I wanted to put that to the test. After I had blown his cock nice and hard, I slowly pushed it into my cunt. My stepsister was right. His rock-hard glans massaged my clitoris so much that I had one orgasm after another. But then my stepsister suddenly stood at the window and caught us....