I know people have wondered why Koiko doesn't just cuff Nika on the head, tells her stealing is wrong and takes her notebook back. There have been so many times when the two were alone with Nika waving the notebook under her nose and she had a perfect chance to do it, yet she never even tried to yank it from her hands, so it's reasonable that you wonder what's wrong with this girl. Well, there's the answer now: Koiko is a masochistic bottom who actually loves being teased and dominated by a younger girl. It's gotten to the point where Nika started appearing in her masturbatory fantasies to chase prez away! Pity that Koiko is too dense to figure it, or to realize that if a certain chick you claim to dislike actually keeps popping up in your mind every time you shlick, that's your subconscious trying to tell you something.