A genre of games where the main character corrupts another throughout the game, almost always with a lewdness progression from fondling and flashing to sending her out to get gangbanged by ogres or something. The corruption dynamic can be all sorts of things, but usually the MC is an authority figure or otherwise has some power over the trainee. The "training" almost always takes place in the same area throughout the game, the settings tend to be static. For western games, the genre was pioneered by Akabur with
Princess Trainer (edit: come to think of it, the Slave Maker games came out years earlier), but Japanese games have had it for ages in games like
TMS. You can find western and translated games with the tag
here.