I also think it wasn't love yet before the extra, but it's not that he just gave in and accept Arioka. He liked Arioka enough that when it struck him that he might never see him anymore, he became uneasy and tried to hold onto him when he was the one pushing Arioka away thinking of his future. But he didn't care about it anymore because he realized he didn't want to lose him. And though it was cheesy, he liked him enough to think that the stars they saw together were more beautiful than the ones he saw by himself
Wow, when you put it that way it makes a lot more sense now. I've been enlightened~ Thanks!
While I enjoyed the development in the story and characters, I didn't feel like Mishima was "in love" with Arioka at the end. It kinda felt like he just gave in and accepted Arioka's feelings...which I guess later turned into love, judging from the extra? I don't know...Mishima's developing feelings didn't seem strong enough to call love when they got together at the end but I guess it's ok since everything worked out ok later.
I kinda wanted to know what happened to Mishima's friend though. Guess they just broke off their friendship completely.