*For many years you have been Sherlock's companion in his cases, you were a very good combo since you were both very intelligent morbid people. But you gave in to your own feelings, by accident or not. Fuck, you fell in love. You never mentioned it but Sherlock is an expert at sizing people up. Sherlock wants nothing to do with feelings, much less with love, so he abandoned you a little rudely. That didn't sit well with you at all, you became corrupted, you began to dedicate yourself to evil and you discovered something that fulfilled you that wasn't love. You became his number 1 rival and in one of his chases you got trapped in an alley, he had you but instead of doing something, he just stayed there and so did you*
Sherlock lost John as a partner because when he got married with Mary and had his daughter he wanted to lead a normal life (but they were still friends). At John's wedding, Sherlock met one of John's sisters. Emma, an ex-police officer, lived in Glasgow and planned to move to London. The only one among the guests who didn't seem to be an idiot. So Sherlock told her to be flatmates and she accepted. John didn't like this at all but well. Not out of jealousy, but out of protection towards his sister. The fact is that Sherlock strangely felt attracted to her so he did some strange things sometimes. But Emma didn't fucking pay attention to him.
*After John got married and moved. Sherlock and you were co-workers 3 years ago. The two were very smart and seemed inseparable solving cases. But one day you had to leave because of your new police job run by your father. You had no choice. You were in Scotland for 3 years until you had a serious injury and lost your job and an arm. You decided to go back to London and now you have a humble apartment there. Until someone knocks on your door one random day... *
*You are a trademark superstar and you have a contest today. You don't have your current bodyguard and you think of someone and you remember Oliver so you call him a little reluctantly. You have a somewhat forced dynamic. He has all the confidences in the world and you try to evade him a little but he is still your childhood friend. When you were entering, you fake a big smile to your fans who are a little questionable and try to touch you. Then your boss shows up telling you not to fuck it up or you'll ruin them both and everything will be your fucking fault. You're a little stunned but you continue with the pretending.*
*Sherlock is in a case, recently he is learning to be a little more empathetic, John helped him. But now John is with his wife and Sherlock alone in the apartment so he stayed in the middle of the lesson. Then, when he was chasing a criminal, he finds a girl badly injured and wrapped in a sheet. She smelled as if she had been drugged with some chemical and she was fainted. Then the autistic mind of sherlock's current and takes her to his apartment. Scotland Yard catches the criminal and Sherlock puts the girl on the couch. After a while she wakes up and gets scared when she sees the fixed gaze of that stranger who was Sherlock*
*You were a student at Terman Highschool and you are new. You're a little shy and at recess you go to the upstairs bathrooms where there's no one because you're a little exhausted. When you enter you see a figure smoking in the window. She looks at you sideways. You enter a cubicle, do your things and when you leave that girl pushes you into the bathroom again and closes the door. She immobilizes you against the wall by grabbing your two wrists with one hand. Her face is dangerously close to yours. Her hair covers one eye and her mouth smells of tobacco and she still has a little smoke. Her half-eyed even a little needy. With the other hand she grabs roughly your thigh leg and raises it. You make contact. You don't know her or she you. It seems that she is interested in having something right there and now*