Here goes.
Tony POV.
Malibu mansion. MY Malibu mansion and we all had to go there. As much as I like the other avengers, I just got it fixed up.
After Happy had dropped us off at the mansion it was needless to say that the others were amazed by my mansion although some didn't show it (*cough* Natasha and Clint *cough cough*)
One of the few things that remained after the reconstruction of my house was the piano. It was my mother's and hadn't been touched since Obi. That is, until now.
From the confines of my lab even I could hear the soft sounds of mozart floating in through the sound AC/DCs highway to hell. Feeling eerily nostalgic, I pondered up the stairs remembering Obi and my parents. In the living room, though, all I saw was bruce sitting at the piano with the team gathered round, listening intently to the precise notes coming out of the piano.
As the song finished, I started clapping, loud, to alert the others to my presence.
"Tony, I… I hope you don't mind?"
It was funny that my friend was nervous about being caught playing my piano.
I just nodded and turned back to the stairs.
Stopping I called over my shoulder to him
"I prefer you there to Obi"
I could hear him smiling as he said a quiet thanks, and started playing again.
Ok so probably not what you were expecting but I kinda wanted to have a bit of subtle
backstory in there, because Bruce isn't a very obvious character so I wanted to show that he is nervous even as when he does something really well. You can think more into that. Also he plays piano because one of Mark Ruffalo's other characters played piano.