She's perfectly welcome to share the bottle, so there's no accusation of stealing forthcoming from him. There is the matter of 'wine then whiskey, always risky,' but presumably she knows her own limits and if she passes out, John will be happy to help her find her way home. And if she wants to show any gratitude for that, he won't object.

"No exorcisms to speak of. Quite frankly, all the demons I've encountered 'ere have been a bit lame." Crowley, he's looking at you. "Just doing me government-given job mostly, which is spokesman for 'Snuff It Out' Anti-Tobacco Campaign," he says as he lights another cigarette.