Never Change a Running System (слэш)

Sherlock discovers his sexuality – with far-reaching consequences for John.
"John, I would be grateful if you would stop staring at my penis," Sherlock remarked into the gaping silence, without removing his empty gaze from the window.
The doctor, caught out, couldn't do anything other than swallow, loudly and with difficulty. "Believe me... you couldn't be any more grateful than me."