This was so lovely! Particularly liked the way the place tilts and shifts around them, the fact we aren't presented with anything definite as to what the ghost is, and my favourite bit was Remus looking through Sirius, and all his mental adjustments suddenly falling away so he's no longer sure he even knows him at all. To be honest I was settling in for a cosy/hot fic about the two of them being snowed in together, but it turned into something very different and slightly unsettling that felt very true and touching and in character. Beautiful!