This reminded me, Ami recently told Maya she would never chop off Sensei's penis so what did she mean by "I'll just have to chop it off"?
I'm still of the opinion that Ami was talking about her hand or hands, as in "what if you hurt him again?" - "I'll chop it off."
There's a few mentions of chopping off hands, and Ami seems haunted by the fact that she could actually hurt someone she cares about:
Before Chapter 4, Ami didn't actually seem to think she'd hurt someone:
Probably a big reason why Ami required a mental breakdown to even accidentally hurt someone. Quite a few of these girls wouldn't require one, lmao.
Of course, I suppose Ami could have just been talking about her hair. Sel probably wanted the audience to think about Sensei's dick though.