Admin Mawile: (。´∀`)ノ
Shuu: He doesn’t care in the slightest. It’s entirely up to you what you do in your spare time, and he’s not going to bother to interfere.
Reiji: As long as the other girl isn’t a bad influence, he’s fine with it, but otherwise, the friendship will soon be cut off.
Ayato: He’s immediately jealous of someone else getting your attention, and most likely does something to scare the girl away from you.
Kanato: He’s instantly, furiously jealous, and quite probably kills the other girl just to make sure that you can’t like anyone but him.
Laito: He’ll make all manner of disgusting “jokes” about you and your friend, even going so far as to invite her to play with the two of you.
Subaru: He doesn’t care one bit who you want to be friends with, and avoids getting involved in the matter entirely.
Ruki: As long as you’re not doing anything you know you’re not supposed to, he’ll allow the little friendship to continue.
Kou: Does that girl know you’re dating an idol? What would she do if she found out that you should be giving all your attention to him?
Yuuma: He’s fine with you doing what you please, and does nothing to interfere with the friendship unless it starts causing problems.
Azusa: He’s delighted that you’ve found a friend, and is perfectly content knowing that you’re happy doing things with her.