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"Rosamund Grace Mycroft Watson, what do you think you're doing?"
A girl around 14 years old and had just snuck into a crime scene, froze at her Aunt's voice.
"Aunt Grace, I...I..."
"I've told you again and again that you cannot come to scenes!" Grace says taking the young girl by her shoulder and escorting her back behind the tape. "I told you last time that I don't care how much of a copy you are of your mother, that you are too young to be here! Even if I'm now the Chief Superintendent!"
"I know but i was bored at home!" The teen whines and sounding way too much like Sherlock for Grace's sanity. "I'm out of school for the summer and my college courses don't start until the Spring!"
"I don't care, Rosie." Grace says sternly. "Donavon, the scene is yours! I'm taking Rosie home!"
"Yes, sir!"
Grace, now Chief Superintendent over Scotland Yard, was completely white in the hair and should've been retired by now. She was pushing that age and wasn't as fast or agile the way she used to be but couldn't resist going to a scene once and awhile, especially if Sherlock came to be involved.
Sherlock and John wasn't as young either. John's shoulder pained him most days now and another surgery was forced on him when Rosie was 5. it got worse and the bone kept hurting and hurting constantly. John was forced to give up working as a doctor altogether except for the occasional scrap his wife got into or the few times Rosie got into a fight at school because they gave her shit about who her parents were or bullied her brother (who Sherlock and John had when Rosie was 7), Henry Alexander Hamish Watson.
Nowadays, John stayed behind more often on cases because he had suffered another injury, this one to his thigh, and he's now bound to use a cane the rest of his life. The few cases he did go to, Sherlock was made to leave him behind so he just...stopped showing up. The Consulting Detective hated it so she took Rosie with her once or twice, just to have someone to talk to. Turns out, Rosie picked up on her mum's talent and had begun to make her own deductions.
This led to her sneaking her way into crime scenes, graduating school early, and starting college courses to become a Private Investigator and part time Scotland Yard Consultant. She could only do either of them officially once she turned 18 but it didn't stop her form completing her degrees in the mean time.
Jonathan Holmes was much like her and had went to Uni earlier, too, and was almost done with his necessary degrees to do the same as her. The two had become very close over the years, closer than regular cousins, and was set to take over being Consulting Detective and Faithful Blogger. She would take over for her mum where Jonathan, and his knack for technology, would take over John's blog and continue the Holmes/Watson legacy.
When they arrived to Baker Street, she sulked behind her Aunt Grace as they went to the flat. The bottom flat was empty now that Mrs. Hudson passed and left the way she had it for her memory. 221C had become Rosie's room where her old one became Henry's.
"Sherlock, John, found Rosie at a scene again!" Grace says as they entered the flat.
"Rosie!" John scolds, limping his way out of the kitchen. "What have I told you?"
"Not to go?"
"And what did you do?"
"Go..."
"Oh, John, quit that!" Sherlock says with a chuckle. She was sitting at the kitchen table, hair still thick and curly as ever but with silver streaked throughout. "Did you solve it, Rosie?"
"It was obvious it was the gardener!" Rosie says. "But before i worked out why, Aunt Grace caught me..."
"That's my girl!" Sherlock says beaming. Grace sends her a withering look. "But...don't go off on your own again!"
"Oh close enough!" Grace says, throwing her hands into the air in clear frustration. "I think I might just take my retirement when you hit 18, Rosie! Save myself from this!"
"You retire?" John snorts. "I'll eat my coat if you ever retire!"
"Hey, I've been thinking about it for the last year or two. Mycroft, too. We can only do so much nowadays. Sides, Donavon has become a good DI when I moved up and maybe she'll work with Rosie and Jonathan!"
"We'll see about that!" Sherlock snorts.
Grace shakes her head, bids them all goodbye, and leaves.
True to her word, when Rosie turned 18, Grace and Mycroft both retired. Sherlock continued to go to crime scenes as she aged, showing her daughter and nephew the ropes and the Art of Deduction, as she called it.
The Holmes boy and Watson girl was just as smart as their parents, getting the Holmes brains but the Lestrade and Watson heart. They became a force to be reckoned with once Sherlock deemed them fine enough to be on their own. Sherlock and John then decided to retire themselves to write a memoir of their adventures with added chapters for Grace and Mycroft. Henry, who still lived at home with them, became a star rugby player until he graduated college and decided to enlist into the Army.
The enlisting came to a shock to his mum and dad because he was set to become anything he wanted with the generous fund Mycroft had set for him (and Rosie had one, too, so no favoritism!).
When the shock wore off, his parents hated to see it happen because John knew first hand what war could do to a man, whether the PTSD attacks, night terrors, on the field injuries, or getting shot and invalid home to a bleak existence after the world is suddenly changed for you...Well, they didn't want him to go but he did anyway.
Everyone came to see Henry off to his first assignment, tear filled eyes all around him. Hugs and hand shakes, tears, well wishes and good luck, he was off to boot camp and then to another country, another war.
During the years he was gone, Sherlock and John finished and published their book The Consulting Detective and Her Faithful Blogger and it became a hit all over the world. The old blog was flooded with comments but John no longer looked at it. It wasn't his any more, but Jonathan's and Rosie's. They were now The Consulting Detective (which Rosie never took that title because it would be her mum's and only her mum's forever) and Blogger (Jonathan never fancied himself a true blogger, even when he wrote about the cases he and his cousin went on!).
Unfortunately, the years passed and Henry never came home. They didn't get word from him for months before an official document came to Baker's Street informing them of his death and that his remains would be shipped home. Sherlock and John had cried for their lost son, Rosie for her little brother, Jonathan his cousin, and Grace and Mycroft for their nephew.
The funeral was a small affair as they laid him to rest for the final time.
From day on, Sherlock and John was never the same.
They came out of retirement as a part time team for Rosie and Jonathan. John did the research because of his bad leg and phoned with results. Sherlock couldn't do much running at her age but she went to scenes a few times with Rosie when Jonathan couldn't.
The one time both Sherlock and John went with them on a huge case, it proved to be too much for John's heart. At the scene, once the hostage situation was taken care of and Rosie and Jonathan was proved to be safe, John collapsed on the ground, hand over his heart. He lived long enough to tell Sherlock he loved her before he closed his eyes.
They never opened again.
A few days later, Sherlock picked up her old drug habit again and not so accidently took a fatal dose. The family was devastated but they knew the death of her husband would be her demise, even before the kids had been born. Mycroft and Grace knew if one of them died, the other wouldn't be far behind. It was just a miracle that they lived to an older age with how their daily lives were.
Both funerals was held together and a mist settled over London, as if the city itself mourned the loss. Rosie and Jonathan took up living in Baker's Street and became the new crime fighting duo the city needed, running across rooftops and now commanding their own Homeless Network.