*looks around* Imagine Yuu walking up behind Mika while he's sitting down reading a book. Then Yuu leans close & blows into Mika's ear, Mika gets startled & slightly flustered. Before he can say/do anything Yuu just hugs him from behind & says "Just when I thought it wasn't possible to love you any more than I already do, I end up finding out more cute things about you". Mika just sighs & says "Baka Yuu-chan", a faint smile on his face. The Squad+Narumi are shocked by this display of affection.
You have no idea how many cute headcanons I have about Yuu complimenting Mika’s ears. You just added another one to my list and I hope, like I seriously hope, the manga addresses it. I want Mika’s ears to be shown, by like the wind moving his hair or something, and he gets all embarrassed and ashamed cause it makes him feel like more of a monster but Yuu, being the sweetie he is, compliments him and tells him how he looks cool as fuck and how they can be awesome monsters together. Mika would be pissed that Yuu would joke about being a demon of course, but he would also be relieved that his favorite person doesn’t see him any differently.