It might be what you would call… Assumed, that Bruce Banner didn't have particularly amazing fine motor skills.
And for most situations, this is the truth. Ever since The Other Guy became a part of his life, Bruce had given very little effort in activities that require fine motor skills. He found himself forced to give up many things he enjoyed before the incident; auto mechanics, suturing, sewing. Anything that required that precision was, as far as Bruce could tell, a lost cause.
But in the many long periods Dr. Banner had spent forced to twiddle his oversized thumbs, he'd developed an arsenal of talents. He could speak a dozen or so different languages, was an incredible cook, and had a mental library of nearly all classic American literature. These things didn't require that precision that Bruce lacked.
There was one thing, one field of interest, Bruce had never been able to pursue because of his 'handicap'. Music. Despite the fact that Banner quite enjoyed it, the harmonic language that musical instruments could create, he could never play an instrument himself.
Couldn't, that is, until Tony found out about his unfortunate disability. When Bruce first mentioned this fact to Tony, Bruce hadn't intended it to be seen as a misfortune. In his eyes, it was just life. The Other Guy would always take things away from him, it couldn't be helped.
Tony disagreed. With calloused hands splayed across his arc reactor in a dramatic motion, he declared to Bruce that he would show him how to play. As the genius he was, Tony had to have some hidden musical skill as well, didn't he?
That was when Bruce found himself staring into his own reflection in the sleek, black surface of a thirty thousand dollar grand piano. Tony of course played off the piano's purchase like it was nothing, but Bruce honestly couldn't believe the man had purchased something this expensive... just for him.
It was at times like these that Bruce wasn't willing to identify how good Tony made him feel.
Bruce ignored said feelings in favor of the real, physical ones. Like the warmth of the arc reactor against his back as Tony leant against him, slowly guiding his hands where they needed to go on the ivory keys.
The lessons went surprisingly well and Bruce couldn't really say why that was. There were many factors to consider and, being the man of Science he was, Banner wanted to go through all of them.
Maybe it was the fact that this time; Bruce wasn't playing on a busted organ in a tiny Indian village's church. Maybe it was the fact that this time; Bruce wasn't shaking with exhaustion and fear and anger as he tried to play.
Or maybe it was the fact that this time; Bruce was trying to please someone besides himself. He was trying to please Tony. Bruce found that he really liked pleasing Tony.
When Bruce pleased Tony through these lessons, it was with gentle caresses upon the ivory teeth that connected to a thirty thousand dollar beast. The ending result being beautiful sounds which rang out through all of Stark Tower.
And in result, Tony began to give rewards.
When Tony pleased Bruce through these lessons, it was with gentle caresses upon the man that connected to a massive green beast. The ending result being beautiful sounds which rang out through all of Stark Tower.