“Are you ok Tina?” the doctor quietly asked. “Oh yeah, I am ok,” a nervous Tina replied back. “There is another part of this study I could...’t tell you until today. It also consist of seeing if a woman orgasm is heightened by the size of a man’s cock. This young lad’s cock is around ten inches so I am hoping you can handle it.” “Oh wow! I guess I can.” “Well, let’s start then. I need you Tina to get on the bed so the young man can stimulate her vagina with his tongue.” Tina got up onto the. With my arms up under her legs and the hands over the thighs, my fingers parted the lips of her inner sanctum. I must admit that the sight is not the best of views when looked at that close in all its detail. I knew the names of each part that was just under my nose and which of those parts were sensitive and those that were not. With the erogenous zone chart in my mind, I paid special attention to her clit, rasping it with as dry a tongue as possible. Feeling it rise its small distance to a. I myself was a full head taller but than that still only amounted to 5 foot 8 inches. I had short blond hair inherited from my mother, and was peculiarly skinny. My sister in particular was very weak physically but had the graceful movements of a ballet dancer. She loved to spend time in the ballroom section of the gym, and has already competed in several dance competitions. She hadn’t won any yet and I had promised to help her train next time she goes.In any case, I stagger up the stairs and. .uh...yeah...yeah...oh, yeah, fuck me man! Let me have it good!"Bart was really pounding him, hitting him hard with each thrust.Alex, meanwhile, was stroking his boy meat. Drops of pre-cum were oozing out his pee slit. I reached over with my finger and rubbed it into his cock head."Get on your back, Ben. My turn."I did what he wanted and held onto my legs. He greased up. My hole was well lubed already, and used to Bart's thick stubby, so his five inches slid right into me.I wrapped my legs.