Married, bi With woman who had a son before we met. Him and I have grown very close since he hit puberty at a young age. As a family we are very open about everything to include sexuality. He knows his mother and I are both bi and play around a bit.
While his mother was away recently for work the unspeakable happened, I feel horrible but excited at the same. A situation came up and I had sex with my stepson. I thought I was doing good with a wide eight inches but he made me feel small. He made the first move and I went along with it, before too long I was feeling his massive tip forcing its way into my ass. I could feel his cock stiffening, twitching with hot glory. He plunge deep into my asshole stretching me, making me feel like my stomach was being pushed into my chest. He was absolutely incredible and I let him bust inside me. After which we took turns, we 69'ed, everything we could we did.
Now his mother is back and he wants to keep it up, he even wants to share with her about the things we did. I don't what to think of all this. He's expressed to me he wants to be in me while in his mother. All I can think about is his huge dick in me again and shooting my load over him again. When I fuck his mom in the ass all I can imagine is its me burying my cock in his round musclely ass.
What am I going to do?