[Smiles, and actually almost laughs at that last bit.]
I'm sure it will work out. [His side-eyeing of Yato doesn't mean he doesn't get he's important to Yukine, and he doubts someone like him would've been so close to a person who would be a genuine jerk.] Don't worry about us, we'll be fine.
... She's not called "Charming", by the way. [That's what caused him to laugh.] That one's just a nickname.