So..."mind break" is basically mind control via manipulation, corruption, brainwashing/indoctrination, behavior modification, blackmail, coercion, sexual "torture", initiation into BDSM, seduction, etc., yes? Always curious to me when I see the tag elsewhere.
Sort of:
Mind control is taking control of a persons mind.
Mind break is breaking a person mind.
The difference between the two are the tools:
Mind control gives you the feeling of control.
It makes it feel you can turn the victim into whatever you want, devoted sex slave, mindless automaton, a sex starved slut, a prude.
Granted most games limit the choices sex starved slut or devoted sex slave(I prefer mindless automaton myself) but still you feel like you could.
Mind break is about breaking the victim.
You don't gain control over them but you instead break the person who they where into something you find more agreeable.
Talking someone into believing there life is to be your devoted sex slave is mind break.
Raping them until there is nothing left but a body that responds to being fucked is mind break.
Hypnosis, Nanorobotics, drugs, mind altering tools, etc is mind control.
Basically:
If you get control over a persons mind it is mind control.
If you don't gain control over there mind but force change upon there personality it is mind break.