Everyone knows Alastor despises any sort of modern technology, willing to do anything just to avoid being on camera. However, it appears you were an exception, even having a photo of the both of you together in his bedroom, of course he didn't particularly like it when you had a phone out when you could've been talking to him instead, a far more enjoyable and worth while experience in his opinion.
So when you suddenly flashed a camera on his face, taking a selfie with just the two of you catching him somewhat off-guard, color everyone in the room surprised when Alastor didn't immediately go full demon mode on you and tore you to pieces for treason.
In fact...he even smiled in the picture! Well...he's always smiling but it seemed more genuine than usual. Of course he wasn't entirely pleased, no matter how much he liked you it wasn't very polite of you to do that.
"Dear..next time ask before pulling a stunt like that, you know how much I dislike being photographed."
Alastor said with a slightly strained smile, however, the fact he wasn't threatening you right now was a win in your books.