[@Zoey Boey] I like how you did it because you chose, albeit unwittingly, the absolute most informal, affectionate way to address him. (First name, no honorifics, so intimate it's usually reserved for immediate family only.) It says a lot about the character that she addresses him in such a way. Particularly if Ishida does not return that affectionate language and merely calls you "Yonaka-chan" or some-such.

No worries if others don't want to do it but I'm gonna keep doing it because it'll make the game more immersive for myself.