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John looks as his boyfriend sticks his head out of the window and peers down, apparently not caring of the rain pelting his inky-black curls.
Several seconds past. "Uh, Sherlock?" John says, inching closer.
"Yes, John?" Sherlock replies, not moving from his position.
"May I enquire as to what you are doing?"
"Smelling the rain and observing the droplet patterns on the pavement."
"May I ask why?"
"Because I want to."
John stares at Sherlock for a bit before deciding that that's a decent enough answer. About a minute goes by before John grudgingly asks, "Can I join you?"
In response, Sherlock shimmies over to the right and John joins him on the left. They spend a long time like that, just the two of them admiring the rain - and each other.