I turned on the shower and let it get nice and steamy before stepping inside. The sexy girl followed behind. Once inside, she grabbed the liquid soap ...nd pumped it into her hands. Then, she rubbed her own tits, making them soapy. It was a sight to see. I watched as she teased herself by playing with her nipples. I felt so dirty and so wrong, but so horny for this girl that all my reservations slipped away. I pushed her up against the glass wall and kissed her hard. Her soapy tits pressed. Would you tell me what’s wrong?”That had worked with Mom, but Marcie didn’t even acknowledge that I’d said anything.Fuck. Fuck. What the fuck had happened?I tried asking Marcie a few more questions, but she didn’t say anything. And that’s when I thought to look at her laptop.She was on a reddit thread - /r/sex, it looked like. A guy was asking about a potential threesome with a brother/sister pair, and the comments... Oh, shit.The comments weren’t positive.“sorry but it’s just wrong”, one. I never do that you wife tells you but I didn't want it to stop either. It was uncomfortable at first and I was going to stop but that big black cock felt so good in my pussy and it's hard to talk with another thick black cock in your mouth. He came in my mouth and I tasted his Cum, there was some on my face but the next guy did seem to mind as I sucked him. Your wife tells you now how it felt so good now, her pleasure was immense as she welcomed each thrust into her ass. Is this what she could. Then I turned her around and made her ride Amar’s dick. I put my dick on her ass and started fucking her from behind. She was loving the double penetration and was moaning loudly.Amar was already close, due to the blowjob. As soon as she grinded harder, he came into her pussy. I kept on going inside her ass.I spanked her once in a while and kept on fucking. After Amar came in her pussy, she came on his dick. I controlled cumming and took my dick out. To prolong my spraying, I stopped wanking.