Loki is more surprised than anything that he'd somehow gotten past Steve's defenses. Not that he minded it in the least, finding the idea pleasing in equal measure. Not that this was surprising, Steve was ridiculously attractive even without taking into account his personality and playful sass.

He's also well aware of that little shiver lips quirking to a small pleased sort of smile as he deliberately nuzzled in a bit more securely, though clearly that wasn't on purpose it was just that he was so enjoying how close they were.

Which was true too.