This kinda reminds me of the one where two orphans were BFFs, and one was unknowingly a dragon who only turned into a dragon and ate people when someone was bullying the other. That one had a Bad End all around though, this one seems a lot lighter. lol
I...I don't want to be reminded of that story.
I'd rather read fluffy Onee-loli with a cute serious loli and tsundere/airheaded Onee.
The neko side of the Onee is seriously cute.