Snowflake
Every snowflake is unique. Not one is like another. John is reminded of this when Sherlock comes home from a case completely COVERED in snow.
"What? Did you have to stand outside for hours?" John asks as he stands to help brush off the snow.
"Not hours. It's just snowing extremely heavily." John starts at Sherlock's hair brushes the snowflakes out of the dark curls.
"You know not one snowflake is like another. It was proven I think. I long time ago. You should do an experiment on snow or something"
"That... Is actually a good idea John." Sherlock smiles at him, that 'Just-For-John' smile. John smiles back.
"Thanks. Now get inside and warm up. I'll make tea and start a fire." John starts into the kitchen.
"Really John, I'm not going to contract pneumonia from a few snowflakes!" Sherlock exclaims.
"Well I'm not going to take that chance! I've got to keep you healthy. If I don't who will?" John says heading to the fire place. He throws a smile over his shoulder.
"You really care about me, don't you?" Sherlock asks sincerely.
"'Course I do. Your my best mate." the kettle boils and John leaves the small fire he's made. "Here" he hands over the cuppa.
"Thanks" Sherlock takes a ship. Milk, two sugars. Just the way he likes.
"Welcome. Want to watch some telly? I know you like making fun of those crime shows"
"Oh sure" And they settle in for a cozy night in 221b as snowflakes fall outside.