Visiting our grandpa has its perks. Yes, he's an old man who falls asleep very easily, but that's exactly what makes it fun. See, my stepsister is a bit of a slut, and it's kinda hard not to get horny around her. So we like to do some risky stuff whenever we can. I really didn't think I'd be fucking her at our grandpa's house today, but damn, she was so fucking wet when we got there, I had no choice!