So I saw the edit of Benedict Cumberbatch shirtless and in tight leather pants and this AU came to mind. I'm 98% sure this will be used later in the case against me to prove that I have fallen down the Adlock Rabbit Hole and have issues that need sorting out, but here you go.
Sherlock Holmes, a once promising classical violinist prodigy, is the found and leader singer/guitarist of the very popular rock band the Baskerville Hounds. Known for writing his own hit songs, he’s also a alcoholic, notorious drug user who’s in and out of rehab every other year and a self-professed sex-addict. But after a slump of a year, his manager, Greg Lestrade, and his label, St. Barts, drop him, in enters Irene Adler. Manager, psychologist, and lawyer, she’s known for her cut-throat tactics, she offers her services to the band and almost instantly rejected by Sherlock and sent away. Then chaos happens. The other founding member of the Baskerville Hounds, James Moriarty (who left to start hiss own band), sues Sherlock and claims that the three most popular songs Sherlock claimed to be his, actually belong to James and that Sherlock stole them. The band takes a secret vote and without Sherlock’s knowledge, agrees to hire Irene for damage control. He hates her at first, but she does her job surprisingly well and within a month, the lawsuit is dismissed and the Basker Hounds have a new label and their first concert after almost a year. From then on, life seems to be going great. Sherlock’s clean, the band is flourishing and there seems to be no stopping the Baskerville Hounds. But as their popularity grows, so do old habits. As the groupies come back, Sherlock’s sex addiction does too (he tries to hook up with Irene a few times) and with that, he slides back into his drug habits. The band has a meeting and they decide that Baskerville Hounds won’t survive with Sherlock and he ends up getting kicked out of the band. That night he overdoses and is found by new band frontman, John Watson and Irene Adler.
A year later, Sherlock’s being picked up from rehab by Irene who fills him up on what he missed since he left. The band broke up a few months ago and John married a former Baskerville Hounds groupie named Mary and has become a country singer. Greg retired and is sailing the world on his yacht with the EMT, a girl named Molly, that he met the night Sherlock overdosed. Bill Wiggins moved to Iceland and became a sheep herder with Henry Knight. As for her, she was managed Jim Moriarty’s band A Good Old-Fashioned Villain for awhile and had an on-off again relationship with him before the band split up due to lawsuits. They talk as she drives him home where his brother is waiting. Mycroft explains that he’s hired Irene to keep an eye on Sherlock to make sure he stays clean before heading off to leave the two to hash things out. It’s weird at first but Sherlock’s so done with being angry that he begrudgingly accepts it. They fall into a routine of bickering, flirting and petty spats and when the newly appointed housekeeper Mrs. Hudson sees them, she thinks them married. John and Mary visit frequently before moving into the place as it’s far too big for just Irene and Sherlock
Then John goes on a small tour and Mary goes with him and Irene and Sherlock are left alone again. It’s then their relationship escalates one night and they begin a romantic one with chaste kisses and light touches. The pressure builds up as the days go on until the two can’t take it and he has her in the living room. From then on, they have an active sex life and lose track of time. Sherlock goes back to the violin and writing songs for other bands and Irene takes care of the finances and contracts. They don’t even realise John and Mary come back until they walk in on Irene and Sherlock in the pool; though John’s reaction is ‘about bloody time!’.
The end takes place almost a decade later where the Baskerville Hounds have a reunion concert and in the front row, are their wives and kids.