For real, This just seems like NTR with extra, extra steps, like what's the point? Going out of your way to get preached at like everyone isn't doing the same shit?
Tsuyatsuya has been drawing hentai since 2000, but all his works look the same with similar plots. It's always some young guy who lusts after his mom or a woman who is a mother figure to him. Hirugao came out in 2010 and was completed in 5 volumes.