I was shocked and angry at first but didn't let on that I'd overheard them because, I would have had to fight each of them (And almost certainly get b...aten up by several of them), and it would be humiliating for my mom. But it made me start looking at her in a different way, I started looking at her tits and looking up her skirt where possible, and being that age I kept getting embarrassing erections that I did my best to hide.She caught me masturbating several times in my room and told me to. He told her to lay back on the bed. She did and had her knees together. He got on the bed and grabs her by the ankles, spreads her legs apart, then wraps her legs around his arms. He told her to pull her panties over and when she did....he slowly pushed his huge cock into her meaty, wet virgin pussy. She cried out OH God. He commented on how juicy her pussy was. He then started fucking her HARD! He was up on his hands, getting full deep strokes. Her cute round bottom looked so cute. ." I said. "You what?" They both asked. This already felt as if we were having surgery."We always did something together as a family every Saturday, no excuses, and I suggested strip poker. I guess to make a long story short, we played, we liked what we saw on each other and we all had sex," Brain replied. "You had sex with grandma?" Angelina asked. "Yes," I replied looking at the ground. Honestly, I felt a little sick to my stomach."We played every Saturday and we always wound up having. Then suddenly he stood and turned her facing the opposite wall, flipped up her skirt and without hesitation plunged his cock deep in that beautiful pussy and began pumping. To my surprise, he looked over his shoulder at me and smiled. Once the young man had seen me and smiled, he repositioned her with her hands on the chair, which caused him to back up almost against the glass of my booth. I took this as an invitation of sorts, and I reached through the slot to tough his ass as he pumped her.