Hit and love

Sherlock and John have known each other for a month and they are both interested in being more than friends, but Sherlock doesn't want anything to happen because it means he will have to tell John he is transgender and he is sure he will lose him. One day some boys learn that he is a transman and they use the information to humiliate him in front of everyone. John happens to be there and it's how he learns it.
Or the classical trope of John defending Sherlock against assholes and then being freaking amazing about Sherlock being transgender.