Eyes
John's PoV
It always amazed John how rapidly his flatmate's mood could change; one moment he was jumping over the furniture in joy and the next shooting up the wall with boredom.
His eyes were the perfect reflections of those emotions, crystal pools through which the light of excitement or the icy coldness of his judgement shone.
'The eyes were the windows to the soul'
John had heard the saying countless times before but he had never quite believed it until meeting Sherlock Holmes.
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Sherlock's PoV
Everybody always huffed about how blue was a cold colour, but Sherlock would bet everything he had they had never looked into John Watson's eyes.