y'all say this development is sudden but really, how long did you want this realization to be stretched out for?
Having the thought "huh, seems familiar", voicing it and immediately being told "fucking finally, took you long enough" def makes for better pacing than another 17 chapters of
"okay i think she might be my childhood friend, but is she really? Let me go through the most convoluted ways of secretly confirming my suspicion without her finding out" xD