For a while now, Sherlock has been picking up on a certain scent when Ian gets home. After about the twentieth time, he told John.

"He smells, John."

"Yeah? He's a boy. We often smell."

"No, like," Sherlock sniffs Ian's jacket again, "Cigarettes. And poorly made perfume."

"Perfume?"

"Is that what you're concerned about?"

"No, sorry. Do you think he's smoking?"

"I don't think he's smoking. I know he's smoking."

John tells Sherlock he can handle it. And Sherlock does handle it. A week later.

"Can you tell me how long you've had this secret?" Sherlock asks as he gazes down at Ian who is sitting on his bed holding the pack Sherlock found.

"Why are you even asking? Of course you know. Are you going to Punish me or not?"

"We need to talk about this."

"Why?"

"Why? Because you're 15!"

"Only for six more months."

"You're far too young, Ian. How did you even buy these?"

"We had an older kid buy them."

"We?"

"James and I."

"Does James' parents know he has this habit?"

"First of all, it's not a habit—"

"Of course it's a habit."

"And James' parents don't know."

"Should I break it to them?"

"No!" Ian shouts. "Hell get in trouble."

"And you're not going to?"

"I didn't say that."

"What do you think your punishment should be?"

"I don't know."

"I think not being able to go out for a few weeks should give the addiction long enough to kick, don't you?"

"Fine." Ian pouts. Before Sherlock leaves, Ian stops him. "How old were you when you started?" he asks.

"Let's see…I think my first one was when I was 14. And I had a consistent habit when I was around 16."

"So you were young, too."

"Yes. Which is why I don't want this for you."

"Why'd you start?"

Sherlock sighs, "Well at first it was just to try. And after that it was because it helped me think."

"What if it helps me think?"

Sherlock laughs, "Find something else."

Ian shrugs and hands Sherlock the cigarettes. Sherlock takes them downstairs and begins to take one out of the pack, but John stops him.

"What?" Sherlock asks. "I was just going to have one."

"You're setting a great example." John takes them from Sherlock and crushes them in his hand. Sherlock watches and rolls his eyes, but he knows John's right.