Like conventional bindings like cloth gags, ball gags, handcuffs, rope. - And bad guys to implement those mechanics?
It seems like you may have something very specific in mind, I can say that I'll explore the concepts as we build out new nsfw scenes, as for bad guys to implement, we do take a pretty hard stance of having no portrayal of assault, so it may look more like a bdsm club or parody of 50 shades of grey. That being said, I'm all ears of ideas!