>>6476396It's not necessarily a hentai but i know it's on fakku and it's by souryuu.
Black Gakkou ni Tsutomete Shimatta Sensei
To badly he never has sex but it's all about how he won't do it.
The good news is that souryuu does have a lot of doujins, his biggest one Friends with benefits is about a gyaru-iah girl. Exhibitionist and with dyed hair.