A/N: Another 'first' inspired by ASiP ;) Hope you enjoy!

Lipstick

"I can't stay," Molly said, slipping into her coat as Sherlock barged into the morgue, "I have a date."

Her comment caused Sherlock to stop in his tracks, "A what?" he asked, turning to face her.

"A date," Molly repeated, as she finished closing her coat.

"So?"

"So, I have to get ready," Molly explained as she collected her bag.

Sherlock frowned, "If you need to go to the effort of impressing him, perhaps he's not worth it," he suggested.

Molly hid a smile, "Putting a little effort into how you look implies that you think they're worth it, Sherlock, it's polite." She shrugged a shoulder, "Besides, sometimes it's nice to dress up a bit."

"That shouldn't matter," Sherlock countered, resuming his route to the drawers of cadavers, "you're still Molly no matter much effort you put in."

"I'm going to take that as a compliment," Molly said after a moment.

Sherlock shot a confused look over his shoulder as he opened one of the drawers, "How else would you take it?" he asked absently, pulling the drawer out.

Molly shook her head, "It doesn't matter. Um, you can stay if you want to," she continued as Sherlock started to open the body bag, "but I really need to go."

She hovered by the door for a few moments, but Sherlock was engrossed in his examination of the body and, feeling a little disappointed, she slipped unnoticed from the room.

Hours later, Sherlock was broken from his examination of a sample under the microscope as the memory of Molly wearing lipstick and asking him if he wanted a coffee sprung, unbidden, into his mind.

Unconsciously he sat back from the microscope as he considered that, for the first time, he may have seen but not observed a very important detail.