ATID-533 10 years ago, when I was masturbating in my room, my reclusive older sister was watching me. From that day on, we started having sex hidden from our parents. Tsukino Luna

10 years ago, when I was masturbating in my room, my reclusive older sister saw me. My sister, who was curious about male genitals, started touching my cock... and I ejaculated. From that day on, we searched for opportunities when our parents weren't around and devoured each other's bodies.