"John, you should think this through."
John glanced at Sally, lips tightening, and made sure to lower his voice, not wanting to distract Sherlock. "Donovan, while I... appreciate your concern, I really don't think my relationship with Sherlock is any of your business. As I've told you already. Repeatedly."
"John, you're being ridiculous," she huffed. "You could have anyone you want, and yet, you choose a psychopath who keeps you around because you're convenient."
"Sally, I'm serious. Piss. Off."
"God, you even sound like him. You shouldn't-"
"Would you two shut up," Sherlock snarled, kneeling besides the dead woman on the floor. "If you can't be quiet, then leave."
Donovan sent John a pitying smile, the 'I told you so' evident on her face. They both turned around to leave the room, when Sherlock's baritone voice spoke up again.
"John, I didn't mean you. Donovan, please make yourself useful somewhere else."
Donovan sent a last glance at John and left the room, muttering darkly to herself. John waited until she was out of earshot and shuffled closer to Sherlock, kneeling beside him.
"I assume you heard our conversation."
"Impossible not to. You were being too loud." Sherlock turned his head to look at John, his gaze softening. "You know you're not just convenient, do you?"
"'Just'?"
"You know what I mean."
"I know, Sherlock." John sighed, "And I think you made that rather clear, asking only her to leave. Very subtle."
"Thank you." He returned his attention to the body, a grin spreading on his face. "I actually need you to inspect the corpse, of course, but why not killing two birds with one stone?"