Fiona did not protest but just let it happen as Franks cock all wet and shiny slid out of site up Fiona’s anus reappearing again only to start pumpi...g. I continued to pump Marge’s cunt, she said “Not up my arse, your cock is nice and thick compared to Frank’s and I love feeling my cunt entrance being stretched.” I said “ Can we manage to roll over” “ No” she said “ But you sit down on the settee and I will sit on you” So I dismounted sat on the settee, she placed her knees either side of me,. To which she gave a big smile and thanked me.I met her again at the gym once. She came quite late in the evening. I asked her why she is coming at this time instead of the usual timings. She told me her husband and in-laws have gone out of station for two days. She could not leave the kid and come to the gym.The kid slept only now. She thought of quick work out and then go back to her apartment. I continued to work on the cross trainer while she was busy cycling. Then we both winded up at the. “O god baby that’s it, fuck me Jessie, drive my cock deep into your cunt, take me, I’m gonna fill your womb with my seed”“O fuck yes Bobby, you feel so good inside me, cum in me, fill me with your hot cum, o god yes Bobby give me your cum”Bobby was holding Jessie’s hips in both hands as their bodies plunged together, thrust after thrust, burying his erection deep into his sister’s womb.Jessie threw back her head screaming in passion as her body tensed and then shook to her orgasm, moments later. I knew I should put on a condom, but I didn't have one. Hell, I knew I shouldn't even be doing this. But I was taught to listen to my mother, so I just guided the head of my cock into her dripping pussy. As I started to push in, I felt mom pushing back. She wanted to be fucked. I don't know what came over me. I was past caring. I still remember the feeling of that first stroke. How it felt to pull almost all the way out, and plunge back in again. I don't know how long we were locked into that.