It's okay Steve, it's fine for Billy to be right.

"A big dragon with a princess knight on its back, and lots of flowers. You got it. I gotta eat breakfast, and then I'm going over to see my little sister's mom to make her surprise dinner. But when I'm not cooking, I'm going to draw you a big dragon with a Princess Knight with flowers. Promise. Might not be done until tomorrow morning. That okay?"

Because of course he's going to be nice to the girl.