I remember the adoptive mother was seducing men at night to consume them. She told her kid to never peep or enter her room, but he couldn’t resist the temptation and curiosity of the smell and sound coming out of the room. She thought about eating him as well after he found out, but she couldn’t bring herself to do it. They just ended up having sex. I think this doujin was very recent and popular in 2025. The mom is definitely some kind of yokai or monster in human form.