"...A baby, I want you to return to infancy and never grow up again" The received goes down and Kyle shrugs, only it doesn't take long for him to realise that everything appears to be getting bigger, except for his clothes which were undergoing a change.
Before he could even give a shocked yelp, his clothes became a baby blue t-shirt and underneath a thick, puffy disposable nappy/diaper, and a baby dummy/pacifier appearing in his mouth.
"Here you are, sometimes I wish you hadn't learned how to crawl" Kyle looks up to see his mother walking towards him, she was like a giant in comparsion.
He tried to speak but all that came out were babyish sounds, he opened his arms to be picked up and his mother did so, holding him gently and patting his thickly padded bottom.
"It's bed time, sweetie, and you need cleaned up" Kyle realised how wet and messy he was, he hadn't even realised he had needed to go.
As his mother cleaned him up and changed his nappy/diaper to an even thicker and puffier night time one, he thought of how he would get his revenge, if he ever managed to.