“A Cozy Evening” by YuXavier / madame-le-maire now has fic on AO3.
It was a bitterly cold January in London, but it was not a pleasant winter day. The clouds that were hanging above the city only made it damp and uncomfortable, and the snow that had fallen earlier in the week had turned to slush. All the Christmas cheer had gone with the lights and decorations, and a chill wind was blowing through the streets, occasionally making itself felt as a draft through the sash windows of 221B Baker Street. Even with the central heating cranked up to the maximum setting, the flat felt as unwelcoming as a pile of bricks. That was before John had decided to clean out the fireplace in the living room.
Read it here.