[Chinese]NACR-840 Sex education for the virgin brother! Intended only up to pseudo-intercourse, but unexpectedly ended up with mid-insertion deflowering?! Nami Kuroki

We invited a pair of close-knit siblings who we picked up on the street to participate in an H project with a bounty! The younger brother, who shares a room with his sister, is surprisingly a virgin! His innocent younger brother is taught how to have sex by his older sister! If they can manage 'teasing,' they'll win the bounty. Although the sister is reluctant to lecture him on the subject, she gradually starts to enjoy it...