Ten years ago, my shut-in older sister saw me masturbating in my room. We've been having sex behind our family's back ever since. Luna Tsukino ATID-533

Ten years ago, my sister, a shut-in, saw me masturbating in my room. She, who was fascinated by men's genitals, started touching my penis... From that day on, we've been having sex behind our family's backs, each wanting the other's body...