He'd really thought that this would be the deal breaker for Zach, and was surprised at himself to find that he felt bad about it, hurt already. He wasn't expecting such a display of affection, or more, of acceptance of the way he was in the next breath.
He wasn't (just about) obtuse enough to take Zach's teasing as a genuine statement, although he knew he could be difficult, but then the sweet, affectionate kiss to his forehead just about undid him entirely, enough that all he could do to the way Zach just about sent him back to bed as to curl up on it and sigh a heavy, sleepy sigh. Wasn't out of it enough to not say a quiet 'thank you' though.