Elena headed outside again, glancing over at him.

"So, we go check out her flat, what else?"

"If I'm right, her flat will yield the evidence we need," Sherlock said. "Though there is likely already sufficient evidence in the food, I want to find the chemical itself, as well.

"The more evidence the better," Elena agreed, settling into the cab. She was already planning on making him eat after they'd finished the case, since she knew he had a habit of not eating.

Sherlock wasn't even thinking about eating, which wasn't unusual. Instead, he just got into the cab and directed the driver to Kelly's flat.

Elena let him take the lead again once they were in Kelly's flat, searching for the chemical so they could prove she did it. And maybe once they had enough proof Kelly would admit why she had done it.

It took a little searching, but Sherlock managed to find an empty canister in the trash in the kitchen. The container had the same sharp, acrid smell to it as the food in the victim's house, and there was still a residue on the inside.

"This is it," he said.

"Excellent." Elena passed along the information to Lestrade. "Good, that's all done. Back to the Yard now or are you satisfied?"

"There is nothing more for us at the Yard," Sherlock said. Which was a good thing, really; he didn't particularly feel like putting up with Anderson and the rest of the forensics team.

"Right. Tea, then?" Elena looked at him, leaving it up to him if he wanted to go sulk for the rest of the weekend by himself or not.

Sherlock almost refused. But he knew that if he did, he'd hear it from John for a while. So instead, he nodded and followed her.

Elena took him to tea and made sure he had a scone to pick at, even if he didn't eat the whole thing. That was better than nothing, after all.

And he did only pick at the scone; Sherlock barely paid it any mind at all, instead just drinking some of the hot tea.

"I still don't understand why John had to leave," he muttered. "Especially with a case on."

"Maybe he wanted some time with Abby," Elena said with a shrug. "I mean, they are still dating, they're doing pretty well actually."

"He did say something about that," Sherlock mused. He made a face. He didn't like John going off like that, but he also wanted John happy. It was a very complicated problem.

"I know, people are complicated," Elena said with a sigh. "Especially socially inept people, they can be the worst."

Sherlock raised an eyebrow and looked at her. He knew that was a dig against him.

"One does what one can," he replied. "It isn't my fault most people are idiots."

Elena chuckled and shook her head. "You are going to be so screwed if John ever asks Abby to marry him."

That was something Sherlock didn't even want to think about.

"Don't be ridiculous," he said. "Why would he?"

"He wouldn't yet," Elena said, watching him. "But he might one day."

But she did leave it at that, instead taking another sip of her tea.

Sherlock pouted as the thought entered his mind and refused to leave. He drank his tea and looked around the shop in an effort to distract himself.

"What are you doing the rest of the weekend?" Elena asked after a little while, looking at him.

"Nothing," Sherlock replied. "Unless Lestrade comes across another murder."

"Perfect." Elena wasn't sure what she'd do to get him out, but she'd find something.

"Perfect?" Sherlock asked, glancing at her. "How so?"

"Means I can keep an eye on you and make sure you don't get into trouble." Elena looked at him over her tea cup.