Sweet, thick soprano notes sung out against the bedspread and softly glowing walls of the white bedroom at 221B as Sherlock plucked at the finely tuned strings of his violin. John groaned, rolling over as he wrapped himself in the soft down comforter, "That's nice," he croaked, rubbing out some post-coital tiredness from his clear, dark blue eyes, "I've never heard this one before."

Sherlock nodded, long and graceful fingers continuing to pick gentle, flowing notes out from nylon strings, using naked legs to kick parts of warm duvet over his chilling lower body, "I'm aware of that, John," he said, taking a quick look over to his companion, beaming slightly the way John looked basked in a post-coital glow, "I just made it up," he smiled.

John hummed, drawing himself closer to the detective before placing a gentle hand against his thin, naked chest, "It is lovely," he murmured as he wiggled himself into Sherlock's protruding ribcage, resting his head against the bones before kissing him where his lips rested, "Just like you," he chuckled.

Sherlock chuckled alongside him, fingering out a last couple of notes before placing the violin onto the mahogany nightstand, "That is quite true," he grinned, using a flat palm on John's lower back to guide his head up to his chest, placing a light kiss against dirty blond hair as the doctor complied to his unspoken want.

John chuckled lightly, using his hand to gently tracing along the prominent bones of the detective's ribs and collar, humming against the action. "I love you," he said softly before looking back up into clear aqua eyes, smiling when he watched them break into a slow melt.

Sherlock nodded, returning the loving gaze, knowing it was sincere as he witnessed the dark blue irises shrink against expanding pupils, "I know you do," he said in the same soft manner, running long fingers into his partner's short hair, "I love you, too," he smiled a closed-mouth smile before pressing his lips against John's with sincerity.

The doctor pulled away with a wide grin, resting his head back against the detective's bony chest, "I know," he muttered, drawing circles against the sides of his ribs, tracing the shape down towards his naked and prominent hips, "But, I'm glad I got to hear you say it."

Sherlock nodded, burying his face into John's hair before tossing the comforter over both of them, in order to feel John against him again. He hummed against his concentrated body heat and the still lingering, but faint, stench of sex against his skin and hair before kissing him again where his lips rested, "John?" he asked in the same soft manner as before.

"Yeah, Sher?" John replied against his chest, fingering gentle circles against his companion's hipbone.

He coughed into John's musk-scented hair before properly responding, "Can you promise me that you'll never leave me?" he asked with a sense of misplaced awkwardness and distrust as he palmed flat circles against John's muscular shoulders.

John nodded, closing his eyes, "As long as you can promise me the same."