Responses
even if he wasnt a tsundere, most people dont switch to first names automatically, from what ive seen in yaoi so far. i think it mainly has to do with the fact that people in japan call each other by their last names so often and they get used to it. but i guess it depends on what kind of person you are.

I was always wondering...they love each other, they are in passionate relationship...so why they don't use their first names?