The Headmaster is the "Corruption based porn game" that a focuses on a few differently.
The general paradigm of most corruption games are:
Harem: you almost always get a massive harem.
Headmaster harem: ... This game doesn't have the harem tag. Because what you have doesn't qualify as a true and proper harem.
Servitude/Breaking: when playing a corruption game there are several generalized methods of breaking people.
Blackmail, Forced cohortion, slavery, servitude, love, false love, forbidden love, ect love, mind breaking ect.
Headmaster breaking: punishment for violating the rules, operating with respect of a government issued inspector (till you corrupt her), operating within a large scale legal experiment (mk ultra) were expectations are set and precedent has been set when it comes to failure, slowly and with understanding of how to prevent. Punish a "good" girl (Priti) and you lose the game.
Grinding:
Headmaster grinding: hahahahahaha there's none.
Characters: tropes who implode on themselves. Commonly with a mental realization as you break them down and force them to overcome on their own.
Headmaster: you got the flunkies. But everyone has their own reason for being there. Everyone has their own individual passions, interests, and fetishes. But everyone also remains who they are. As you make sure to explain the how and the why they are there. The Headmaster makes sure to follow a proper procedure to make sure that each girl lives in both joy and pleasure.
Fetishes: there's a lot usually falsely represented.
Headmaster: there's a lot with emphasis on making a realistic representation.
Overall The Headmaster is the best NonVN that's a VN on here.