"Mhm." John said, picking up the newspaper. "Just so long as-wait, what?!"

Sherlock smirked.

"You should really learn to listen and allow your brain to process before you speak."

"This coming from the man who says something, pauses, and asks me if that may have been 'a bit not good'," John scoffed. "And no!"

Sherlock scowled. "Fine."

John ruffled the newspaper, signalling the conversation was essentially over.

Sherlock was quiet for a while, until he announced again, "I'm bored John..."

John sighed. "Well, find something to do- that does not involve me losing a bit of my brain."

Sherlock scowled. "None of those things are interesting!"

John sighed. "Fine. You can do that experiment with my blood."

Sherlock perked up. "Really?"

"Even though I'll regret it, yeah."

"Arm," Sherlock demanded after retrieving the supplies.

John sighed, and held it out grudgingly. Sherlock expertly stuck the needle in.

"How much are you taking?"

"Two vials."

"I don't even want to know where you learned how to do this."

Sherlock shook his head and finished up.

John sighed, holding a piece of gauze to his inner arm, wondering what Sherlock was going to do.

Hidden away in his room, Sherlock stared at it raptly, and murmured "John's blood..."