Positive reinforcement?

D may or may not have an obscure form of autism called hyperlexia, but we've been proceeding as if he does, correcting and coaching his speech patterns:

D: You want some Halloween candy?
Squelch: Say, "I..."
D: ... want some Halloween candy.
Squelch: No, say "I want..."
D: ... some Halloween candy.
Squelch: The whole thing, honey.
D: I want some Halloween candy.
Squelch: Please.
D: Please.
Squelch: (raises eyebrows)
D: I want some Halloween candy, please.
Squelch: Great job, son! No.

Very long driveway. Very small house.