"Yeah." Being a cyborg sounded cool. For a whole second (that probably only Wally actually saw), Bart's head lulled back and his eyes closed and his body relaxed. He had passed out, but thankfully when he woke, he didn't jerk or kick.
He looked away when Wally said that Barry would have been proud of him. Bart always thought that he would be- that they had a special connection (he was named after his grandfather, after all)-- and thanks to virtual reality, Bart had grown up with an approximation of Barry around to encourage and guide him.
But as it turned out, none of that was real. And it was an odd thing, to know and feel so strongly about someone who had no idea that you existed. No matter how he strived or how far back he went, he never quite caught up with Barry for more than a few fleeting moments.
Wally though... Wally had grown up with the real thing-- and Bart didn't know if he should trust Wally's opinion about it, or just stew in envy.
For the first time ever, Bart was the quiet one, and gave Wally room to talk. He was concentrating, buried deep in his own head with thoughts whirling around like tornadoes between his ears.
And then the doctor said they were done. Bart almost laughed- except that there was the whole cast thing and the nurses were already swarming him to get his leg wrapped and slathered up. They even let him pick the color he wanted (red), and one of the nurses even volunteered to put a design on it... a lightning bolt.
Bart looked over at Wally throwing his fit in his paper gown.
"hey." He said, quietly, then reached out, holding his knuckles out to his cousin for a fistbump. "Piece of cake." He encouraged, just barely starting to smile.