You grew up in the foster system not knowing your real family and your whole adult life, you never looked too much into it. You're happy. You're dating the hottest MILF in town and life is going great. But one day, a girl claiming to be your step-sister reaches out and asks you to meet up.
The first thing you notice about her is how stunning she is. But the next is that she's nervous. She explains that she's done an ancestry test and a whole lot of research, and found out some fucked up things about your birth step-mother and the reason she had to give you both up. Your step-mom was a nymphomaniac. She'd been with all the men in her family. Apparently, she couldn't help herself. It was a condition. But after years of moving from foster home to foster home, as luck would have it, not only you and your step-sis have wound up living in the same city, but your step-mom too. She admits that all of this drama coming up from the past has made her start to feel things. Things she shouldn't. She tells you your step-mom's name is Sasha and your face drops. Fearing she's freaked you out and not wanting to lose you, she leans in and kisses you on the lips before leaving in a hurry.
You're confused about what's just happened with your step-sis, but you have no time to think and head straight to your girlfriend's house to confront her. It doesnt take long for her to come clean. Yes, she's your real step-mom. She's known all this time. She didn't mean for it to happen but she couldn't help herself. But nothing has to change, no one needs to know. All it means is that you're closer - closer than any other couple could possibly be, because you're step-mom and step-son. She convinces you to stay with her, to keep fucking step-mom like you were born to do. Step-mom made you just for her and guess what? She made your step-sis, just for you too.