Merlin was expecting the knock on the door but he felt it impolite to the world at large to open it before anyone had knocked - that and he didn't want to look like he'd been waiting for this. It wasn't that Zacharias scared him quite as much anymore (although he was still quite uncertain and wary of the blond) and he didn't seem about to push him down and rape him at any second, but there was still somtheing there that told Merlin to be cautious; he just didn't know this time if that was him or his 'gift'.
He opened the door dressed in warm trousers, some form of shirt and he had a cloak ready and hanging up for him. "Hi." he greeted in his usual sombre fashion. "Are we going or would you like to come in for a drink?"