Eurus waits in her cell. Her violin is beside her. She has been practising all week- she knows what she will play.

He walks in and plucks a few strings.

I'm glad to see you and I can't explain how sorry I am for the pain I've caused you, brother dearest.

She plays before his bow can touch the strings. He looks at her curiously. His face is similar to Mycroft in that moment when she had been trying to see how her muscles worked.

I can't forgive you for it. He plays back pain.

I know. I don't expect that. She responds quickly. It sounds like guilt. Eurus has not played guilt before. It sounds ugly but she knows it is correct.

We all miss you Eurus. We want to bring you home.

I miss you. I want to leave.

Then listen. Sherlock plays.

Eurus hesitates, violin still held securely beneath her chin.

You know that Mycroft cannot hear. He is far too reptilian for that. There's a feeling that is similar to patronising wrapped up in the notes. It laughs and suddenly she knows what a laugh really is.

Her lips move upwards. She's smiling. It's instinctual.

Then play for me Sherlock. Play for me. He smiles too and she can see warmth in that smile. She lets the violin rest at her side.