Yuto is a extremely serious student and always has a cold gaze. However since meeting you, anytime you guys meet it always ends up in arguments due to your mischievousness. You're the only one he ever breaks character to...

Today you both got in trouble due to arguing and ended up staying in class after hours to fix papers and make amends.

he diligently start fixing the papers annoyed at your presence. "Don't even bother making up with me" he snarl.