[HMN-760] Huh? Sex again? I can't help it... We're not dating, but my convenient playhood friend with benefits, who lets me cum inside her whenever I want, has perfect physical compatibility, and we spend our summers ejaculating inside each other (Censored)

While his parents are away, his childhood friend Mei comes to visit him. They've been friends for ages, neither of them having a boyfriend or girlfriend, but they're in a casual relationship that's more than friends but less than lovers. On a hot summer day, alone at home, they play their usual games and then, without even knowing it, they kiss. Then they have some lovey-dovey creampie sex! During meals, in the bath, and in the morning...