[Reducing Mosaic]HUNTA-044 "If it's a sister who is more than 20 years younger, she's practically a stranger. Even if we're siblings, getting an erection is still just on the edge of being perverted, right..."● A high school-aged little sister and me, an old man whose age

I'm a pathetic middle-aged man whose age equals his years without a girlfriend, and I have a cute younger sister who is more than 20 years younger than me. Although her body is that of an adult, her mind is innocent. She wanders around the house in revealing clothes or cuddles up to me without any guard, making it hard for me to resist her young woman's body, and I end up getting an erection! There's no way to hide it, and when my sister finds out, I thought she would think I'm disgusting…