Merlin tensed up a bit when Zach caught him up, but in his defense he'd been expecting a hit; he was surprised Zach had stopped him at all, nevermind settling him back down on the (very comfy) bed.
His eyebrows twitched in confusion at 'no foul' because he was pretty sure storming into someone's house and demanding to be fucked under the knowledge that you were probably going to force them into at some point anyway could be construed as 'damage', but Zach left to get water and Merlin's head protested at being upright for no good reason.
He resisted the urge to lie back for all of three minutes and then he had to, curling up on the edge of the bed like a cat taking up minimum space. He pushed himself back up when Zach returned, taking the toast like he'd never seen it before. "You're being very kind." he said, slightly bewildered; if he'd been any less so he might have wondered if Zach hadn't taken that the wrong way.