I think she's a secret M, doing the same scheme as the chubby guy in Prison School did: by heaping enough sadism onto a target, you get to reap the rewards of delicious pain.

I base this on her expression while eating ramen

Saladofstones said:

I think she's a secret M, doing the same scheme as the chubby guy in Prison School did: by heaping enough sadism onto a target, you get to reap the rewards of delicious pain.

I base this on her expression while eating ramen

I think you're not mistaken. More so because S and M never manifest one without another in a personality. S has M side deep within, and vice versa - M has S, albeit directed toward themselves.