I did not have any space to retreat behind me, so i stayed put. She had by now pushed her ass onto my crotch, so that my cock was placed firmly on one...of her ass cheeks. The swaying of the bus was causing my cock to rub on her soft ass cheek. My cock was throbbing hard now, and getting very, very uncomfortable. I somehow managed to move myself a little to the side, so that my cock moved away from her ass, and i was between the two women, but behind them. As soon as i moved, she looked back. ” I replied.We were having peg slowly one by one and we both were making fun of each other. After having 4 pegs, she laughed unnecessarily saying stupid things. I laughed with her too and asked suddenly “What were those magazines for?” She paused. After a moment she said, “Look dear, to be frank, I have desires too like any other woman.” She added “I was very embarrassed that day when you looked at all those stuff. I should have hidden it properly.” I said “Hey don’t worry about that. I. "Definitely too much soda," Denise giggled into my ear. I just nodded and watched the show, feeling weird, proprietary, cuddly, husbandy feelings toward my sister. After we exited the movie (which had only been mediocre), both of them needed the restroom again. Who could blame them?Wait, wait, wait.We got home about 4:30, and the late fall sun was already setting at these latitudes. Denise began concocting something in the kitchen involving leftover turkey, and Lissa spent some time unpacking. We had our lunch and sat on the couch. I sat beside my mom with a hard dick.Me: Mom, why can’t you stay naked like me? Are you feeling shy in front of your son?Mom: Not like that, honey. I never habituated to stay naked.Me: Try it, mom. It feels so good.Mom: Ok, honey, let’s get comfortable then.She suddenly removed her shirt and sat beside me, wearing the only panty. That was the first time me watching my mom’s beautiful breasts. Her round white milky boobs are awesome. I can’t believe we both.