Kimochi

Kimochi is what happens when Steam and H-Games have a baby.

Since the Steam service is reluctant to allow full-blown adult games without censorship, and only allowing games where it's actually possible to make games you can divorce from the porn without defeating the whole point of playing it, this service was created to serve those users.

The term derives from an expression of pleasure uttered by women in hentai and Japanese live action pornography, which, given the games sold on the service, is an apt name choice.

Unfortunately, due to the inability to maintain server costs, the service had to be shut down March 31st, 2016, but the forums for it will remain operational and they intend to facilitate providing game downloading services in some form if at all possible.

Tropes used in Kimochi include:

Hentai: Subverted on the store pages, which are, to this point, mostly sterile 9unless you view all the available preview images). The links to most of the creator sites, is another story.
H-Games: Their purpose is to distribute and sell them.
The Internet Is for Porn: Caters to the niche this trope is for.
Start My Own: This trope was invoked in response to Steam's restrictions.