@nasenbein is chapter 31 she is masturbating watching the stalking video she took of sensei and MC, then notices her brother peeping on her, throws her phone at the wall in anger and while she cries in frustration in an internal monologue she says and i quote:
"i don't understand. other people are there to be controlled by me. other people have no right. to control my desires. i do not accept this feeling. "
The she says out-loud:
"And big brother wont allow that either, will he?"
Misukana is a shitty person that controls other people in order to deal with her own problems with her brother, but people keep forgetting, thinking she is the only normal character in the story, even after she manipulated her friend and the MC out of their relationship.