She told me to fuck her ass, and fuck it hard. I did as she told me, and buried my cock deep in her asshole. I was slamming her ass hard and fast. I f...lt like a dog in heat.While my mom and I were fucking like a bunch of wild animals, and hearing her scream with every orgasm she had, there was someone watching us. My sister, who was 28 at the time, and very bisexual, was standing at the door watching us. We didn’t know it at the time, until I heard my sister sigh with relief. I looked up. The bathroom seemed more suitable for the furious quick wank I wanted to have, and themoment I dropped my pants to my thighs and gripped my pulsating cock, my mom was onmy mind again. That time she just appeared naked and ready to start the action unlike the lasttime when I visualised her teasing me with a strip and mutual masturbation.“Come fuck that monster cock into me honey,” she purred, her left hand fiddling with bothher nipples at intervals, and her right hand on her pussy, showing me. I dug out the camera and said I wanted to get apicture of Sondra and Bill. Sondra immediately sat on Bill's lap, lettingher towel fall to the floor as she did. After a couple of poses, thingsstarted to really loosen up and I continued taking pictures as Bill's handscovered Sondra's breasts, and Sondra cupped her tits up to Bill's mouth,until, finally, Sondra said she wanted everyone naked for some "porno"shots. As Sondra was sucking my cock for one picture, I couldn't hold backany longer,. We had been careful not to hold hands or even kiss in public up to now. I was surprised when I walked her to our cars she pulled me close and kissed me. It was a passionate kiss that seemed to last long, but not long enough to be suspicious to others that might have seen it. I was a nervous wreck the rest of the day thinking about what was going to happen. Now my sex life with my wife was pretty much nonexistent so doing it with Betty really got me worked up. I had mixed emotions but.