Sherlock, John/Sherlock, first kill (dark!AU).
Together - Sherlock (BBC), John/Sherlock, PG-13
Sherlock is the planner. He expedites, experiments, makes arrangements, everything but pulls the trigger. That's not due to cowardice or squeamishness, mind you. Anyone who's seen what Sherlock puts in a photo album could not possibly say he has a weak stomach. It's just that Sherlock knows himself far too well. He enjoys crafting the elegant deaths, the seeming-accidents, the "random" violent acts, so much so that John can practically see Sherlock quivering when John snuffs out another life.
Sherlock doesn't, because he knows that if he did, he might not be able to stop, client or no client. That's why he hired John in the first place. Ex-army, medically trained, a willing partner to violence, and utterly besotted by Sherlock's deductive method of death, he'd been perfect from the start. Nothing had given Sherlock greater pleasure than to see one of his plans fulfilled at John's hands.
John, however, had wanted more. Standing over the bound reporter, John had looked up into Sherlock's eyes, glittering with the avarice of seeing John complete his masterwork. He smiled, and pulled Sherlock close, fitting the garrote in his long-fingered hands. Pressed close to Sherlock, he guided him in placing it around the man's throat, the knot in the center just so to crush the trachea. Then, together, they pulled. John's hands were on top of his, guiding them, showing him the nuances of the best angle for a swift kill.
The reporter died in minutes, his last view that of his killers a breath apart from a kiss, the distance closing as his eyes shut for the last time.