Talk:Irina Jelavić/@comment-45817661-20200816060855/@comment-24751497-20200817003702

Because she isn't one? She's not even remotely interested in any of the students and doesn't pursue anything with them. Irina is introduced as a racy character, she isn't called Bitch-sensei by the class for no reason.

It's not only Nagisa either; based on an extra in volume 15, she does this with the rest of the class to measure their kissing ability. Generally impractical yes, but as stated during the beach arc, an assassin is a master of many skills; Nagisa puts this to good use during Kayano's arc.