I peeked out my window and saw my brothers friends, about 5 of them screwing around in the shallow end of the pool. I walked from my room and around t...e corner of the back door and saw them again and they were all butt ass naked! All of them seemed to be having fun and thats when I got the shock of my life. I saw my brothers best frind Mark, reach over to another guy and grab his cock! He kinda stroked it a bit and the other guys all gathered around them and watched as he played with that thing. He smiled and said that he wanted my asshole now…I tried to resist, feeling his huge dick was going to hurt my ass; but the bastard grabbed my waist and kept me in all fours, ordering me to be quiet....Then I felt the head of his cock, wet with my cunt juices, probe my asshole. He worked it in slowly at first and then began to pick up speed. He grabbed again a handful of hair. He asked me what was to be his ass slut…His fucking was punctuated with insults and smacks of my ass cheeks, which were. So, we’re gonna keep the same bedrooms, but swap beds every single night for every possible combination, and not all of them will involve sex, at least not with Chase being gay.“I don’t know Mom’s sexual orientation. I assumed that she’s straight, but then I thought the same about Chase, didn’t I? One never knows, I guess. You’re bi and so is Dad, who would have guessed that part?” Maria encouraged me.“That sounds good. Just don’t ask me to do anything with Dad. I don’t want to hurt his. Then dad started spreading moms pussy with his finger and slowly inserting his dick in moms pussy. Mom was aroused completely and was moaning. Dad slowly slowly was entering her and within no time he was completely inside her vagina. Once he was completely inside then he started pushing faster and faster. Mom was totally in pain and was asking dad to go slow as it hurts a lot. But dad was in no mood to listen to her. There was a animal within him during that time. Dad was giving hard strokes.