SSNI-955 Being watched by a beautiful and lustful sister and the ending

I'm a nerd, and today I had a bad day when I was bullied by my classmates and had my pants taken off. After school that day, Sakamichi, a beautiful girl from grade 1, called me, "Hey, I'm curious about you..." When I said that, I pulled down my pants and said, "It's really big." He was very interested in my big cock! Then, as Sakamichi's dildo, no matter how many times she ejaculates until she's satisfied, she will be fucked in a cowgirl chase position...