I want to point out that seems to be a common thing in this community that AB's like to be encouraged to their desires.
I would suggest you to wait for him with everything ready in plain view, diaper him and encourage baby talking while you're doing so. Just treat him like any 2 years old would be treated (or whatever the age he likes represents (if you don't know, ask him in a motherly way "how old are you, baby boy?" or "how old are you today?")).
I want to point out that I have no experience being a daddy since i'm a switch and my gf doesn't like to be babied, so i'm talking about my desires as a boy.