They brought each other off regularly and had invented several exciting positions that got their tongues into each other. Their favorite toy was a big...marker with a knobby base; it reached right to their hymens and excited every sensitive nerve in the entrance of their tight little pussies.Dressed in well worn college t-shirts, they wiggled out of the tiny shorts they had donned for their mother's benefit and went out on the screened porch, their hairless pussies warm and wet, their young minds. He said out loud “all this time seeing your tits in a dress wondering what bra you had on and how they looked without one”? “Now here I am sucking and rubbing them” – “unreal”! He whispered in her ear, ”Good you are nice and wet”. His hand spread her legs to give him access to her big and aching clit. He rubbed her clit for a few minutes, again looking at me for my approval again. Her low moans kept us both hard as I sat in the chair and masturbated looking on. Dave kissed his way down her. She would suck for a bit and then swirl her tongue around my head at its most sensitive part before dropping down and taking my balls in her mouth. I was as rigid as a steel post and I could feel my cum starting to boil. Cyn worked her way back up my shaft licking, sucking, and nibbling as she ascended all the while rotating the palm of her hand over the very tip of my cock. Then her lips once again surrounded my cockhead and I could feel I was ready to explode and told her I was going to cum.. Third day: Third day after routines, she was made to lay on her side with her hands stretched above head and tied. The leg below was tied to the bed at feet and at knee. The leg on upper side was lifted up maximum and tied to the ceiling making the inner thigh maximum accessible for their work. I noticed that throughout their work they were trying to keep her in slightly discomfort able position. Her upper leg was almost lifted vertically. While doing her binds they were occasionally touching.