I'm probably going to do an actual Sherlock recs list at some point, but I just read Undoing Fate by sator_square and I need to recommend it right the hell now, so I'm going to. It's Mycroft/Jim Moriarty, which is not really my thing and will continue not to be my thing, but this seriously good and actually rather sweet. Well. For a given value of the term. But it's really good, okay? If you haven't read it, you shouldn't let the pairing stop you. If you can like a fic for this couple, I'm pretty sure it will be this one.
In it, Mycroft goes back in time to stop Jim from becoming Sherlock's nemesis in the first place. Inserting a time travel plotline into this fandom seems a little tricky, but it comes across really well. Mycroft can go back, change something, and then go forward again to see the effect- and then go back a bunch more times to get it right. It's funny and exceedingly well written, but also very true to the characters. Even when they hardly meet- and Jim is far more interested in Mycroft than in Sherlock- Sherlock and Jim have a really interesting give and take, and Mycroft's efforts to find the right balance are particularly interesting. The development of his own relationship with Jim is fascinating as well.
In it, Mycroft goes back in time to stop Jim from becoming Sherlock's nemesis in the first place. Inserting a time travel plotline into this fandom seems a little tricky, but it comes across really well. Mycroft can go back, change something, and then go forward again to see the effect- and then go back a bunch more times to get it right. It's funny and exceedingly well written, but also very true to the characters. Even when they hardly meet- and Jim is far more interested in Mycroft than in Sherlock- Sherlock and Jim have a really interesting give and take, and Mycroft's efforts to find the right balance are particularly interesting. The development of his own relationship with Jim is fascinating as well.