Publisher: Ero Ero Ohkoku
Caveats: Anal, Bondage, Lolicon
A simple RPG coded in Flash that has you taking on the form of a lad trained in erotic combat on a quest to free the minds of brainwashed girls in a plethora of cosplay. The game uses a very expansive menu of options for you to use on the girls, from undressing them to how you touch them or where you stick it in, with each girl having her own weaknesses. You can buy items such as stamina drinks and sex toys to power up, as well as progressively sillier boxer shorts that are tougher for the girls to remove.
This game is available from DLsite in both English and Japanese. Sadly, the game forever remains more or less a beta release as, with the death of Flash, Ero Ero Ohkoku has basically vanished and is no longer working on any games that we know about.
Devil by the tail