Admin Mawile: (⌒▽⌒)ゞ I really don’t want to research specific things they’ve done in canon, so these are just reasonable sounding ideas/things that I remember off hand!
Ruki:
-Some kind of beating, probably whipping or caning
-Humiliation, like forcing you to crawl around and beg him for forgiveness
-Treating you like an actual animal
-Long, agonizing set ups where you have to complete certain tasks to make the pain end (like solving a puzzle before you’ll be allowed to pull away from something hot)
-Trapping you somewhere physically uncomfortable for extended periods of time
Reiji:
–Whipping
–Unusual drugs finding their way into your food/drink
-Mental manipulation to make you think you’re the fault of everything bad that happens to you
-Stress positions/being tied up in increasingly uncomfortable ways
-Extra lessons (with something painful every time you make a mistake)
Shuu:
-Draining so much blood you pass out
-Leaving you at the mercy of one of his brothers
-Locking you somewhere unpleasant (like a dungeon, Laito’s room) so he doesn’t have to deal with you
-Using known weaknesses (like something that embarrasses or scares you) to terrorize you
-Forcing you to carry him around/take care of him
Ayato:
-Intentionally painful biting
-Torture devices that he finds amusing
-Draining so much blood you pass out
-Threatening to do something like toss you off a roof. Sometimes actually doing it but catching you at the last second
-Dropping you in some body of water (guess where he picked this one up)