I grabbed her legs and spread them apart and move in toward her pussy. My cock now doing a little jig in anticipation of what was to come. She grabbed...her legs and pulled them for me as I position my cock in front of her flooded cavern. I moved the head up and down her lips. She squealed loudly as more of my pre cum oozed over her lips. The heat of the pre cum against her lips and clit was driving her mad.I moved toward the opening and slid the head inward. Oh god she was loose. She screamed as. Almost every night, we would wait until Mum and Dad had gone to sleep before one of us would go creeping into the other's room for an hour or more of sisterly sex.The second memory of that summer was that my own tits began to develop, at long last! My bust was nowhere near the immense size of my sister's, but the puffy little buds on my chest suddenly turned into teats the size of halved apples, which tingled all the time, but especially when Tanya sucked them in bed.By the time that September. Due to her shouting, I was giving her jerks at her faster speed. But this bitch was not ready for my speed and jerks. She started crying and shouting instead of moaning. I asked her, “Why are you shouting now and why didn’t you shout when you were on top of me.”She said, “At that time I was not letting your dick go fully inside.” She further added, “As I was doing it, I did it slowly. When you are doing it you are inserting it fully. On top of that, you giving me jerks which I haven’t. “What’s the worst that can happen?”She pulled it on over her head and adjusted it so that it was comfortable before turning so that Adam could lace it up tightly. When he finished doing so, he also quickly clicked a lock into place that would prevent anyone from being able to unlace the mask without the key which he had in his pocket. Keri tried to say something when she heard the lock click, but the mouth plug prevented any coherent understanding of what she was trying to say.Adam got out of.