In the past this kind of content was covered by the dōjinshi / doujinshi referring to an ecchi manga.
However it seems that nowadays manga authors prefer to cover that base by themselves.
@frostf14 Nah. These ones are considered tame compared to the usual h-works done by Kojima Saya. Maybe if someday this series' h-scenes become more hardcore, it will finally be in a hentai website.