1. Noted
2. When you have the Hypersensitive Nipples status condition, and you wear the Cursed Bra, you get a scene when your ERO gauge reaches full. That sort of thing, but for any item that passively increases your ERO gauge, when your ERO gauge reaches 100%
4. hmm, alternate idea then; if you interact with an NPC while you're at 1% HP or lower, then you get a special scene where they try to help you recover, the method varying depending on which NPC you go to