Stepsister wants to become an amateur. She’s learning how to give a proper blowjob!

My inexperienced little stepsister has finally mustered up the courage to take the first step. She wants to follow in my footsteps and become an amateur. Unfortunately, she has absolutely no idea how to go about it. So I decided to lend her a hand and give her a head start. We invited over a nice guy I’ve known for a while. He’s always got plenty of cum in his balls. And that’s exactly what we need right now. My stepsister is sitting on the couch and the guy is standing in front of her. I’m sitting right next to her, giving her precise instructions on what to do with his cock. When I see how amazingly she’s giving him head, I get so incredibly turned on that I have one orgasm after another…