Sherlock discovered something about himself he would've never thought could be an attribute in a person.

He irrevocably and undeniably adored kissing.

Before that fateful day, he had never really experienced this craving for another's lips so desperately, or in general for that matter. It was especially strange because he only wanted to kiss John, and he had no desire for doing anything else. Yet.

Sherlock constantly had fantasies spiraling through his brain, dancing behind his eyelids as he slept. He couldn't even read until he had his daily dose of Watson. And daily dose he received.

John was always more than willing to comply with Sherlock's embarrassing demands. Some days he required soft airy kisses, and others he craved rough and frantic make-out sessions against the wall or on the coffee table. His dormant teenage libido had suddenly awakened and he had no idea how to control it.

So he didn't.

Sherlock was addicted and dopamine was his drug.

He tried to decipher his favorite thing about kissing, and he came to the conclusion that it was the sound. Everything from the smacking of lips to the positively pornographic moans drove him utterly wild. But there was also the softness of John's lips, and the way John tugs at Sherlock's clothing when he becomes immersed in the kiss. And then there was the location... Sherlock had a strange fetish for strange positions or obscene displays in public, though John never allowed that. Then again, tongues were an amazingly stimulating bonus. So Sherlock hadn't decided what his favorite thing was about kissing after all.

Sherlock also found out he had weak spots that were oh so sensitive. His neck and ears were going to be the death of him. It didn't matter if John kissed those areas or even just brushed against them, it drove Sherlock mad.

Turns out that John also had his pressure points; his knees, hips, and he loved getting his bottom lip bitten until it was deep pink. Depending on if they were sitting or standing, Sherlock would ever so gently hold or rub these areas. The reaction: John's chin quivers and he whimpers desperately -- that's when Sherlock goes in for the kill, suckling and nibbling his lip relentlessly.

The aftermath of the kiss was always the same. The two would be panting, depending on the speed and roughness of the before kiss, and then for some reason, they would start to chuckle as they caught their breath. Sherlock always took note of how shiny John's lips were after he finished ravaging them. Then they would casually go back to whatever they were doing before.

Surprisingly enough, John and Sherlock managed to stay friends. There were no questions of their relationship status, sexuality, or questions about what it all meant. It was already established that the two of them loved each other in a way, so what was wrong with kissing? They never talked about becoming "boyfriends", they just decided that what they were doing was normal among friends who were attracted to each other, and it was no one else's business anyway.

But of course Mrs. Hudson noticed. She had accidentally walked in on them when they were franticly (and loudly) making out on the landing. One day she decided to address it.

She knocked on the door and heard shuffling and a loud, "Come in," shouted from inside. She entered cautiously.

"Hello boys."

Sherlock was sitting rather awkwardly in front of his laptop, while John was sat on the floor in front if the television with a lollipop hanging out of his mouth, some strange video game suddenly paused. They both looked up expectantly at her. She cleared her throat and folded her hands in front of her.

"I know it's not my business, really, but I consider you boys the sons I never had, and I really do care a lot..."

"Go on," Sherlock drawled.

Mrs. Hudson bit her lip.

"Are you two having homosexual relations?"

Sherlock furrowed his brow and looked to John for the answer. John didn't seem to have it, either. Sherlock turned back to a very worried looking Mrs. Hudson, "We like to kiss sometimes, that's all. Kissing has recently been scientifically proven to improve physical health in humans, so there's no downside." John smirked and turned back to his video game. Mrs. Hudson still wasn't satisfied.

"Yes, but...are you two..together?"

The boys both froze and looked at each other.

"Are we?"

"I have no idea, we haven't talked about it. I just like to kiss John," he glanced back at Mrs. Hudson and added, "I've just discovered how addicting kissing really is."

"So let me get this straight..." Mrs. Hudson sat down and squinted, "You're friends with benefits?"

"That seems rather dirty, I don't think we are, all Sherlock really does is kiss me."

Mrs. Hudson chewed her lip again in thought. She left rather quietly after that. As soon as the door was shut behind her, Sherlock crawled down onto the floor where he was before she entered and continued doing unspeakable things to John's lips, taking John's lemon flavored lolly as a trophy.

This was one activity he would never grow bored of.