Let You Kiss Me (So Sweet and So Soft) (слэш)

The first time Sherlock kisses him, John keeps his eyes open, and so does Sherlock, and mostly, he wonders what Sherlock could possibly be up to. There'll be some logic to this. Some ridiculous experiment about body warmth or respiratory rates or testing a new way of picking pockets. Sherlock does the unimaginable for bizarre reasons, but behind it, there's always logic and curiosity. Sometimes, it just takes him a while to explain it to John.