Sherlock had certainly never felt the idiotic feeling of "love", and he certainly never planned to.
But, he certainly didn't plan John Watson, either.
If only that stupid Mike Stamford hadn't run into him at the park, and convinced him to meet Sherlock.
If only Sherlock hadn't told that stupid Mike Stamford he was in need of a flatmate.
Sherlock blamed Mike for his petty feelings toward John, in both a good and bad way. He couldn't focus on his cases when John was anywhere near by. But John made Sherlock feel something different, something he hadn't felt before.
It took longer than Sherlock would have liked to admit that what he was feeling was most likely love (or just "extreme fondness", as he would rather it be phrased) toward John. He tried to ignore it. But every day when he woke up from dreaming about John, the first thing he would think about was John. Then, the first person he would see that day was John. Then, he would spend his entire day with John. It just wasn't that easy to ignore his feelings.
John would bring dates back to the flat every once in a while. Every time a new random woman would step foot into 221B, hand in hand with John, Sherlock felt as though something had taken a bite out of his heart. He would shut himself off into his bedroom, and try very hard not to listen to the gushy, romantic things John and his date were saying.
It hurt Sherlock every time he caught himself staring at John absentmindedly. John would notice, and give Sherlock a look that quite clearly said he would rather if Sherlock stopped.
A few times, Sherlock would find random excuses to touch John. Like when he passed John a paper or a sugar for his tea, he would make sure their hands brushed. He didn't think John noticed. Or if he did, he didn't say anything.
Sherlock always had hope. Even though John had made it quite clear that he was straight, Sherlock never gave up on the tiny sliver of a chance that John might one day return the feelings.
That is, until John announced to Sherlock he was getting married. Sherlock, of course, had put on a happy face and congratulated John, but it felt as though he had been hit in the chest by a -no, several- sledge hammers, a feeling that never did go away.
Sherlock stood by John as he and Mary exchanged vows. His eyes never left John's happy face. His hands were behind his back, and he was clenching them together, trying to not cry as John said "I do,".
At the reception, Sherlock made sure to hug John, congratulating him and Mary. He held onto the hug longer than he should have,as he knew he would probably never get to do the action again. He held John close, his face by John's ear. He mouthed quickly and silently, "I love you," and hoped no one had seen.
He was in luck, no one had. And now no one will ever know.
A/N: I've just made myself sad. I think that writing this might've been sadder than reading it though. Oh well. If you review, I will love you forever. Promise.