Ten years ago I found out that my sister had became a shemale. We once had a fight and she, being a boxer, gave my ass a beating before getting naked and ordering me to suck her cock. She somehow r**ed me but I really liked being dominated by her and her big dick so I gave in. Now I have became a sissy with nice tits and a small penis who serves his big cocked sister everyday. The weird thing is that when our parents found out that we had such a relationship they wanted to join us in a foursome. My dad fucked me brutally while she had some good sex with mom. Guess I am the family bitch now.