This was the best possible scenario for them holy shit! Juiciest drama I've seen in a minute!
Burnt-sugar senpai carved SIX seperate lines into the seemingly normal senpai before finally snapping back to reality. Then offers to turn herself in. If you burn sugar, the outside will taste bitter but the inside should still be unburnt (sweet). The level of regret to want to turn yourself in and never hurt them again by removing yourself from their life completely is sweet in a way... but she already permanantly carved herself onto her body so it's a bit late for that...
Now twisted-love senpai is like, "silly moron, I wasn't trying to break up with you so to make this work, Imma carve SIX lines into your back too. This way we've now secretly marked each other as owned property just for us. Great idea right?"
"BRILIANT! BRAVO! ABSOLUTE CINEMA 0_0"
- Me watching from the stands both disturbed and enthralled.
I may just be imagining the SIX lines thing but it seems like six each. Not sure if that has any relevance.