Well my step-father was away for some time but he hired female bodyguard for my mom, to take her everywhere she wants to go. He says it's because of her safety, but it's because he knows she will cheat on him again. So when my mom is really in need of a cock she calls me to her house. This is nothing new, we already did it before she even knew my step-father. This way she's at home, gets a visit from her son, what is perfectly natural, and her husband doesn't suspect a thing.