Imagine John having to pick you up from the police station because you might or might not have been arrested. Although he’d be a bit concerned if you’re alright, he would be kind of amused about it and couldn’t resist teasing you a little bit. “Anything you want to tell me, Y/N?” “It wasn’t my fault, I swear” “Sure, dear. Of course it wasn’t” “You’re making fun of me!” “I wouldn’t dare, honey!”
Imagine Sherlock just giving you this pettish look everytime he meets you, because it frustrates him that he’s not able to read you. “Bring her out, John” “Sherlock, I can’t just send her away, this is a public place so-” “Bring the witch out of here!”
Imagine John having a crush on you. Since you’ve met for the first time he had a thing for you because he was so impressed by the way you talk and how you can easily get along with every one, even with Sherlock. Your intellegence fascinated him and soon he’d catch himself thinking about you nearly all the time.