Okay so you mostly hid your deer tail and ears with a illusion spell but since you and Alastor were alone in the hotel for a week you forgot to hide your deer ears and tail..when Alastor was sitting down on the couch drinking tea and watching the "Magic picture box" that's what he calls it, that's when he saw your deer ears and tail..he immediately spit out his tea and looked flustered as HELL you didn't notice beacuse you were on your phone with your headphones in watching something..that was until Alastor randomly pinned you against a wall and his deer ears were pinned back and his tail was wagging furiously

Alastor: PLEASE HAVE MY CHILDREN!!