Disclaimer:The characters don't belong to me. Just the idea of the story.

Sherlock Holmes turned the handle on the laboratory door and entered. The lights were off. It meant that Molly Hooper's work had ended. He shifted to the right to turn the lights on. As he made his way to Molly's worktop, Sherlock unzipped a small bag and took out a handkerchief and a bottle of liquid. He set it on the worktop, not without noticing that Molly had forgotten to take her mobile phone which she had left on the side of her worktop.

Sherlock pulled on a pair of latex gloves, slid his finger over the handkerchief and looked at his finger. Nothing. He took a microscope slide from the first drawer and deposited a drop of the liquid onto it. He then gingerly adjusted the stage height of the microscope and magnification before placing the handkerchief on the stage. He examined the cloth closely.

The door opened and Sherlock heard a mumble in a female voice.

"Molly, would you pass me the slide?" Sherlock asked without glancing upwards.

"Wha... hat slide? Where?" Molly stammered. Seriously, thought Sherlock, why does she always have to stammer?

"It's on the worktop," Sherlock replied, moving the handkerchief around.

Molly edged closer to the worktop and helped herself to a pair of latex gloves. She picked the slide up carefully and waited. Sherlock was in no rush. He knew that Molly would stay with him in the lab if he was nice enough.

"Thanks, Molly," Sherlock replied, removing the handkerchief and taking the slide from her.

Sherlock did what he needed to do while Molly took her mobile phone and made to leave.

"It's not safe to wander alone at night. Wait for me. I'll be done shortly," Sherlock said.

It was the kindest thing that he could do — to make sure Molly got back safely so he could still rely on her to see more dead bodies in the future. Molly gave a small sound of assent. He finally removed the slide and looked at Molly.

"Alas, I'm done!" he smiled gleefully, and placed the handkerchief and the bottle of liquid into the zipper bag. "Coming?"

Molly was clearing the mess Sherlock had made on her worktop. "Ah, ye... yes."

As they made their way out of the lab, Sherlock stared at Molly. Molly looked different. More womanly, somehow. Or maybe it was because she wasn't wearing the long white lab-coat that he was so used to seeing her in.

"You're looking lovely tonight, Molly," Sherlock offered as they reached the streets.

Molly blushed. "I'm taking a cab."

"So am I," Sherlock replied as he flagged a cab and offered it to Molly.

Molly smiled pleasantly. "Thank you, Sherlock."

Sherlock gave a small nod as he stopped a second taxi and got into it. "Baker Street, please."