Suddenly, my mother remarried and I suddenly had to live with my stepfather and stepsister.<br /> My older sister Mai was stunned when she saw me for the first time. "I never heard that I'd have a younger brother, or that he'd be one year younger than me. I thought he'd be around elementary school age." Perhaps she felt uneasy about living with such a big brother. I felt a little sorry.<br /> However, after a week, we had become accustomed to living together. My older sister has started walking around the house in her loungewear, which is practically underwear and shows off her big butt. "Don't stare. We're at home, so it doesn't matter what we wear." No, no, when you dress like that, it's just too much for us! Her defenseless, sloppy ass unexpectedly gave me an erection, so I hurried back to my room and masturbated.<br /> My older sister doesn't care about my sexual situation and shows off her sexy ass to me every day. My sister is napping on the living room sofa with her ass exposed... I couldn't resist touching my sister's big ass... It's so soft... I think this is going to become a habit... As I was frantically kneading her, my sister woke up.<br /> "Hey, what are you doing? Stop it... we're brother and sister, you know?" I know that, but my reason has already been blown away... Sorry mom! But there's no turning back now!!<br /> Bury your face in her soft ass, Rubbing his crotch against the crack of her ass, Just insert it from behind...<br /> Damn... I can't get enough of the rippling sensation of this butt... It feels so good that it's a fierce piston! Without thinking about the consequences, I injected my thick semen deep into my sister's vagina...<br /> I did it... Incest... Family breakdown...<br /> The next day, my sister was calm. He didn't tell his parents...maybe he didn't like it? I got carried away and started chasing my sister around when our parents weren't looking...