Suddenly everything makes sense. No wonder he'd never met Wally - kind of hard to meet his wife's nephew when he hasn't even met his future wife. It's Bart's turn to stare blankly at Wally with an expression of slack-jawed horror. He's been married for five years? He can't even fathom having a girlfriend, let alone a wife and a five-year anniversary.]
... Shit, you're serious. [There goes the "being a good role model." He'll eventually learn to stop swearing in front of Wally. He hopes.
The second he hears Wally's stomach, though, Bart can't help laughing, despite his paralyzing fear. Even if he can't imagine being married, at least he's got family here.]
If everything weren't free, this meal would've been on me, you know.