He liked to think he'd never change, but if he were to turn out to be a quarter at ease as Yu now appeared to be.

There appears to be something missing from the end of this; the thought is not quite complete?

peaked -> peeked

lied -> lay/laid

Other than those things (sorry for being nitpicky), this story is utter brilliance and I'm looking forward to reading more! Thanks Lena for reccing the story and thanks Parsnip-chan for writing it. <3