Kirameki no Kyoudai: Sex Crime / Sex crime

Hentai is based on an original story by Kudara Naizou. The main character is a so-called "lucky guy" -  he is a hardcore pervert and constantly thinks about his sister's panties. And his sister herself adds fuel to the fire - parading around the house in just her underwear. Later, our lucky hero catches his classmate masturbating, and then watches his sister having sex with an unknown guy in a toilet stall. In general, he has a busy, one might even say "lucky" life...