You are embarrassed that Kou had secretly recorded your sex sounds. He says he wants to film as well, and says "I'm not shy about it" while he begins filming alone in front of you--
A married lonely woman who is being cheated on by her husband... gets sexually trained and is pleasure corrupted by a super popular guy that's using a secret social media account to promote his sexual prowess.
Your boyfriend, Kaede Hamino, changed after he was bitten by some kind of bat-like creature. Plenty of intense action with your lusty, blood-thirsty man! (CV: Hirame Ichijou)