It's always Been True.

Molly's Song

Sherlock and Molly arrive at the reception with the biggest smiles and the crowd cheers them when they walk through the door.

Molly felt like she was walking on clouds , she was happier than she had ever been. Sherlock made her happy, even though she went through Hell to get to this point she was genuinely happy for the first time in her life. 

Sherlock turned to look at Molly who was beaming and smiled the biggest smile . He felt as though she made his life complete simply by existing and being around him. Now she was truly his and he would protect her for the rest of his life.

As they got through visiting with family and friends it was time for the dancing . Molly looked around for Sherlock but couldn't find him, then she heard the sound of a violin and the whole room stood still in that moment. Sherlock was on stage with his violin playing the sweetest melody Molly had ever heard.

John walked over to Molly and whispered to her.
"He wrote that for you."
He said and pulled away from Molly giving her a happy smile. Molly's mouth dropped open and she looked back up at Sherlock who was gazing at her the entire time he played giving her the sweetest smile. It was Molly's Song. He had composed a song for Molly . She had no idea he had even done any of this . When did he even compose it? John saw the look on her face and decided to explain.
" He started playing this song when he came home the morning after he had stayed with you. I didn't know at the time that anything had happend but from the music it seemed it had. He truly does love you Molly.  " John said and smiled at her as she looked at him with tears welling in her eyes .

As Sherlock finished his song everyone was in awe and Mrs Hudson was drying her eyes.

Mycroft stood in the back of the room with his mouth open in surprise.  Sherlock was, indeed, a changed man, that he knew, but how would this affect his ability to solve crimes and would it weaken him to the point where he would be in danger ? His whole family might be in danger now that Sherrinford is back.

Mycroft looked around the reception area and noticed Sherrinford in the door way . Sherrinford gave mycroft a nod and a smirk and resumed looking at the happy couple beginning to dance in the middle of the room.

Jealousy burned within Sherrinford as he watched as Sherlock and Molly dance and smile at one another.  He was used to being the focus of attention and seeing Molly give Sherlock that attention instead of him drove him mad. He was attracted to Molly Hooper that much was for sure, he didn't know if it was because his older brother had her or if it was because he found her personality welcoming and loving , something he never quite felt but craved so badly.

He was the child prodigy not Sherlock....why was everyone so enamoured with his brother and not him. He was he'll bent on making sure everyone knew his name when all was said and done.