You and your step-sister have always been close, but even you didn't expect where things went. You tried to avoid it, avoid her, after the first time, but you both just want it so bad. You both want it so bad, and so often, that you maybe made some stupid choices. Like fooling around when step-mom was at home. You couldn't help yourselves! And, well, you got caught. There was no pretending it was anything other than exactly what it was, and you tried to tell step-mom it was fine, it was consensual and you're being mature about it, but she was upset. Really upset. And she kept saying she knew exactly what it was like? You think maybe there's something more here, and after being honest with her, you convince her to tell you everything. She confesses that she and her step-brother did something similar, at the same age. You can't believe what you're hearing, but moreover, you can't believe how hot you find it. Thinking about your step-mom doing something like that has you rock hard, but you hide it well, and ask her to tell you about it. Y'know, so you'll understand just how wrong it all is. You listen closely, your cock throbbing in your boxers, as your step-mother explains the details of how she started fucking her step-brother. Of course, you can tell she's getting turned on, too, touching her neck, crossing her legs tight, breathing heavy as she recounts the first time her step-brother slid his hard cock into her virgin pussy. You take your cock out, not sure if its going to go over well, but she doesn't object. "This is wrong," she says, as you press your cock against her, mimicking the story she tells, pressing all the way into your step-mother's pussy while she gasps, moans, and begs for more.