Brunette stepsister gives oral sex while I pretend to talk to my girlfriend

I have this stepsister who's a total hottie. She's got this thing for my dick and I'm not gonna lie, it's pretty exciting. So, when I'm on the phone with my girlfriend, pretending to chat, stepsis is all over me, giving me the best blowjob ever. She's a pro at it, really knows how to work her magic. The timing's just right, she's got my monster cock in her mouth as soon as I pick up the phone. It's a perfect cover-up, no one would ever suspect. She's so good at it, it's like she's got a dick of her own. We're grinding on the desk, me talking to my girl, her sucking my cock like it's her job. And it's all just so damn hot.