Sam doesn’t think he’s right about that, but Dean does seem to know Dad better, so for a second his resolve almost falters, because he doesn’t really want to do something Dad doesn’t want them to do... but no, Dean can’t be right about that. It’s fireworks - of course Dad wouldn’t mind.
Dean levels a glare in his direction, and Sam holds fast with the pleading look. He’s getting how these sorts of things go down, now - it’s like a war with their eyes, and he knows sooner or later Dean’s going to give in, because Dean wants to go see the fireworks, too, probably. Everyone probably wants to go see the fireworks.
>“Fine. Okay. Stop looking at me like that.”
Sam goes from puppy eyes to his brightest smile in less than a second flat, bounces a little in place on the couch with his excitement.
>“We go there and nowhere else, though.” - Dean looks at him seriously, and Sam nods his head, still grinning excitedly. A little sternness isn’t going to get him down - “And if you tell Dad I let you go out I'll end you.”
“Okay, I won’t tell. Promise,” he responds. He doesn’t get why it would be a big deal to tell him - it’s fireworks! - but he trusts that Dean thinks it would be a bad idea, and he trusts Dean, so he’ll do his best not to say a word. “It’s gonna be awesome,” he informs his brother happily - awesome being one of the words he’s picked up from his brother; it doesn’t sit quite right, but it’s the only thing he can think of to fit the moment, because fireworks really are awesome.