My favourite thing to imagine is them playing the piano together on a chill day at home. They sit side by side, each using one hand to play and they’re surprisingly in sync with each other. (the hospital room bits from checkmate did stuff to me).

Whenever Eichi has to work overtime for whatever reason, Leo tags along and makes himself comfortable in his office where he works on his compositions. Even if they don’t talk much, having company feels nice.

I HAVE MORE BUT THESE TWO WERE THE FIRST TO COME TO MY MIND