OMG SAME! did not realize at all until you mentioned it! O_O
ikr??? even though i love this series wholeheartedly i only knew them by kaburagi and onoe all along ╮(￣▽￣)╭
indeed, they've been dating for so long and they still call each other by surnames and I'M GOING CRAZY-- WHEN WILL THEY CALL EACH OTHER'S NAMES??? WILL I EVER HEAR ONOE SAY MOTOHARU OR WILL I DIE BECAUSE OF IT BEFOREHAND? （/TДT)/
Anyway I actually love their surnames even more than their actual names, but still I'd love them to drop this formality and go for the first name basis already ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
that realization of the fact that after 5 years of reading this i only knew their first name by now...(●￣(ｴ)￣●)