We locked into a kiss full of passion and power. I was in the perfect position. I felt her sudden exhalation of breath into my lungs as I thrust fully...into her. Then she pulled her head back and moaned out her pleasure. My thrusts became urgent as I pushed her again into orgasm. I could feel her nectar running over me as she rode the tidal wave of our love making. Our passion had us kissing and thundering towards our conclusion. She pulled back from my kisses, then began to cry out, Cum with. My sister and I have a interesting relationship. Im not sure if its taboo or what but I learned things like how its important for a girl to play with herself sometimes to relieve a lot of stress. At the time I didnt think anything of it other than showing her a useful skill to get through tough times. Lets just say we help each other play sometimes an leave it at that. Almost forgot, James is my brother, Summer is my sister, dad is dad, and Im Alison. I wake up from a hand shaking my leg.. I satisfied myself that it was just an attraction towards my one friend and I do not feel the same way with any other boy, so there’s nothing too gayish in it.Day passed, night came, and we both got to bed. Though we did not watch any porno that night, I was still feeling somewhat hot. The reason was same last night’s incident, which was still making me thoughtful at one side, and aroused at other. I at one state, was hesitating, and on the other, wanted to experience it again. Nevertheless, as. She didn't want the boys to think they could sleep in on Saturday, but she knew that, with the concert, it was going to be a late night for everyone and the boys would be tired."Well, then" Greg added, "you should probably spend the night, Mark. That way, you only have to get up 'early' instead of 'real early' tomorrow."Before Mark or Trisha could respond, the boys were removing their empty dishes from the table and running to get ready for their concert. Blushing, Trisha stared down at her.