Mesut didn't fully understand why Lily felt like she had to knock upon arriving, but then, he supposed he had never clarified or given her an official go-ahead to just floo or apparate in. Somehow, he knew that it had to be her, without getting up and checking. Who else would be coming over? One of the boys, arguably, but they were all pretty sloshed by that point, weren't they? So it probably wasn't the wisest decision to apparate anywhere until they had gotten something steadying in their system.
Indeed, rather than getting up to see, Mesut picked up his wand and flicked it towards the door, unlocking it and letting it fall open.
At first, he didn't say anything. Part of him wanted to see the sort of reaction she would have to the way he was bent over the table, wearing what was bizarrely like beach wear for a man sitting in a low-lighted kitchen by himself. It was, in fact, what he had worn on the day out, and he had been too lazy to change. Perhaps he should have done so before telling her she could come over if she wanted to know what was going on.
He took a long drink, actually wishing that it was still alcohol that ran down the back of his throat, and lifted his head enough to glance towards his cabinet where the stuff was hiding.
Then, he turned his head to stare at Lily in the doorway, half-seeing her but almost daring her to come over and sit down with him.
"Katherine is gone," he said finally, frowning somehow with the whole of his body. His shoulders deflated that much more, and he let out a ragged sigh. His words were drawn out a bit, but he was managing to keep it together at least a little. He still wanted that drink, though.
When he repeated it, he shrugged a bit, like it was just a fact now and couldn't be helped. And his gaze lifted to hers, his blue eyes just hazy and unfocused enough to be obvious despite his nearly-normal speech. "She's gone. I should have told you."