Aw, shit, had Bruce actually warned him about the Arrow-Bat Painting Fest? Jason didn't think anyone could blame him for not picking up his phone, regardless of who was calling; their whole combined family doing what they did meant that there were times when phones were just off, to remove any stray communication or distraction. And Jason figured no one who knew him would really expect him to listen to a message from Bruce: he'd deleted them without opening, not caring - as he said, loudly.
He could have escaped this, but now he was about to turn right around and march himself out, pie or no...when Bruce said please. Jason stared at him, and tried to recall if he'd ever, in either of his lives, heard Bruce Wayne say the word 'please'. The shock of it had his shoulders jerking in a shrug, a little defensive and awkward. "Yeah, well," he muttered.
It was much, much more comfortable to have Mia's snark, even if it came with the 'you better know what the right thing to do' look. "My vengeance for your crime of pie-theft will be swift and merciless," he promised, and didn't entirely mean it in the usual sense, because he also took the paintbrush Bruce offered without quite looking at him, and stripped off his jacket in the middle of the room, dropping it over his helmet.
"So, how much of this can I take up?" Jason muttered to Mia as he surveyed his corner, brush poised without paint.