Her nipple in my mouth was now hard and jutting out. I lightly bit her nipple. Mom screamed. I immediately pulled my mouth aside. Mom again inserted h...r nipple in mouth and said, “Son, I was not hurt. The scream was of sheer joy. I told you, they are all yours. You can do whatever you want. I love you, Sonny.”I kept on sucking her nipple, encircling my tongue around it and biting it a bit occasionally. Mom was already moaning.After some time, Mom said, “Sonny, now the other.”I moved up in her. I wanted to at times but could never figure out how to get it hooked in back by myself. Also the time that required a quick change would have been encumbered by the bra. As the satiny cups of the bra strained over my nipples they took on a life of there own. My nipples hardened and made little points in the stretchy white satin of the bra cups."Look at those titties! Just like a girl, getting all hard when you get excited. You like this don't you?" Marshall quiried."No I don't. It's. And not only a woman, but a woman at least five years older than him.Then, astonishingly, he passed her, moving ahead, not exactly leaving her in the dust, but establishing his dominance beyond argument.She was the one who staggered to a gasping stop, and she did it all wrong.She felt something in her right thigh give, and the sudden pain announced that either her Sartorius or one of the adductor muscles there had been stretched too far, or too many times. Her stagger turned into a controlled. Di looked down at my cock and grinned. We scooted closer to each other, and Di kneeled in between us. She grabbed her boyfriend's cock and stroked it up and down, but leaned into mine and gave it a lick. She looked at Jane to make sure she was going to time the BJ. On Jane's signal, she leaned in and took my cock in her mouth. The second she did that, I forgot all about Judy--my new girlfriend--and let Di go to town. She got me hard in seconds and kept sliding her hot mouth up and down my cock,.