He started to go red and tried to apologise, but I held a finger to his mouth and said it wasn't the noise that he and my sister were making, but the ...ar up the road. This only made him go even redder and I started to giggle at him. He seemed extremely uncomfortable so I decided to have a bit of fun with him.I stood up and asked him if he could rub some after sun lotion onto my back as I had caught the sun and it was a bit sore. He said he would so I lay face down on the bed undoing the towel. Once Chris was able to fuck me, he really showed no further interest in hand jobs. So, I was a bit out of practice, but was confident that I could handle this task.I stroked down, moving my fist to the base of his erection, pulling the taut skin of his cock even tighter as I studied how Glenn’s penis responded to my touch. I noticed that as I pulled my fist down to the base, the tiny hole to the opening of his urethra on the head of his cock opened up for me. This intrigued me.I then stoked up. Then the shriek from mom, “not there Bill, NO BILL, don’t stick it in there!” I looked at Marcia, being 2 years younger I had no idea what was going on. Yes I knew what sex was, a man sticking his penis in a woman, my folks had that talk with me. But the rest was still a mystery. Marcia said, “I think he wants to stick his cock in her butt,” she said pointing right at her ass.I had no idea how she would know that, but it was so scary and seemed to be imprinted on my mind as I grew up. Dad. .."She blinked once.Twice.Her expression was utterly blank, and just as I began fearing I'd said too much, an almost smug smile crept upon her lips."Why thank you, Jeff," she said in an amused tone, moving from her spot behind the counter. She walked through the small opening beside the counter and squeezed in front of me, grazing my chest with her breasts and just barely avoiding brushing my dick. I automatically took a step back, and she smiled wide, lifting herself onto the counter where she.