So this is a story I started writing around Christmas, but then I forgot about it, until today. I finished the first chapter, and decided to upload it immediately. this means it's un-bètaed.
I don't own any of the characters

enjoy!

"Sherlock please, just this one time. Mummy misses you. She told me to beg you to come. She hasn't seen you in years. And she really wants to hear more about your lovely flat mate." John, the aforementioned flat mate had no clue why Mycroft used the devilish grin at last part, but that was nothing new. He had been living with Sherlock Holmes for over a year and he was proud that he knew most of the time what Sherlock was thinking. So why would he understand the oldest Holmes-brother who he only saw when he kidnaps him or, like now, comes to their flat with a proposition for Sherlock.
"No, I won't come. And don't you dare playing the Mummy-card. I've spoken her last week, so she'll be fed up with me for another week."

John sighed. It had been like this for the last hour: Mycroft was trying to persuade Sherlock to come celebrate Christmas at the Holmes Manor and Sherlock kept saying no. And John? He made tea. Lots of it.

"Do it for John." Mycroft tried again. John had no clue Mycroft tried so hard, it's not like he was fond of his little brother.
"Why would I do John a favour by letting him alone on Christmas?"
"You would do anybody who you let alone a favour." Mycroft grinned but stopped when he got an angry look from John. Sherlock was his friend and he would stand up for him.
"But what I really mean" Mycroft continued "is that Mummy invited John as well. And you wouldn't deny John a fun holiday, would you? With someone else than Harry. Think how he would enjoy having a family dinner with our family."
John laughed. First of all because he found the image of Sherlock and Mycroft peacefully singing Christmas carols together ridiculous and secondly because Mycroft thought Sherlock would do something, just to do him a favour.
"Fine."
John almost dropped his cup of tea. Sherlock hadn't even agreed to come when Mycroft had treated to make Lestrade stop calling him for murders, unless they were really boring. So why would he go, just to please John. Like said before, that made no sense.
"Sherlock, you don't have to do this for me. I wouldn't mind spending Christmas alone. You can go spend it with your family. I wouldn't mind some peaceful days, you know."
"John, I like you better than I like all my family together and I know that stupid party would be more tolerable if I knew that there was at least one person who appreciated me and listened to me when I make another incredible smart deduction."
John sighed again. Somehow Sherlock always managed to convince him to do something he actually didn't want to do, in such a way that he made it sound even less appealing to John. But hey, who was he to deny anything the great Sherlock Holmes asked him.
"Fine, we'll go. But you better behave, or I'll take the first train home and you can handle your family on your own."

"Great. I'll tell Mummy that you are coming." Mycroft said and walked out. John was relieved that he had left without saying anything that would make him feel uncomfortable, like his usually does. But he should have known, that he was cheering to soon, because suddenly Mycroft stood back in the door and said "By the way, I was surprised to hear what you have told Mummy about John. I look forward to see if you can make her belief it when she sees you guys together." And then he was really gone. John knew, because he felt uncomfortable.

"Sherlock," John said, trying to convince himself that it wasn't going to be as bad as he thought it would "what did you tell your mother about me that would make Mycroft to damn happy?"
"John, promise me that you won't freak out." Sherlock started, and he seemed nervous. 'Oh my God, it will be something terrible, if Sherlock is nervous.' John thought.
"What did you say?" he said now more urgent, he wanted to take it like a bandage.
"Well, she was trying to find me a good boyfriend, like she does almost every time I hear something from her, so I might have let it slip that we we're in a relationship."
"You let slip that we're in a relationship. We. In a relationship. A romantic one."
"Yes John. I made myself perfectly clear the first time, there is no need to repeat it."

After that they were quiet for a couple of minutes before Sherlock asked "Well?"
"Well what?"
"Will you be my boyfriend. Just for the weekend." He quickly added, when he saw John was turning red.
"What will happen if I say no?" John asked, already knowing he would say yes, but he wanted to make Sherlock realise what he had done and what the consequences would be.
"Well, Mummy will be a little bit angry, then she will try to couple me to one of her friend's daughter's best gay friend's ex-boyfriend; Mycroft will laugh with me and I would spend the entire weekend explaining to people why I haven't brought my boyfriend with me, who isn't actually my boyfriend, but just my flat mate. It would be really unpleasant."
"Just unpleasant? That maybe I should let you suffer through it, just to teach you a lesson."
"John, please"
John knew that was as good as it was going to get, so he gave in.
"Fine, but only if you promise me that you will buy milk the next time we're out and you won't shoot any smiley faces in the wall for at least a month."
Sherlock hesitated a minute, comparing one bad thing to another before coming to a decision. "Fine." He said with a pout, like he was the one making a sacrifice. Then he seemed to think of something funny, because he added with a smile "boyfriend"

John sighed. What the hell did he sign in for?

please review. I promise I will update asap