Call Mommy Stella!
Sweetie, come on over here, we need to have a little talk. Now, first of all I know you want to be a big boy, BUT I cannot keep having you wet your pants all the time. Mommy keeps getting calls from your school and I am finding your bed sheets wet in the morning almost every day now. I think its time that you go back into diapers.
I know, I know, you are a big boy and big boys don't wear diapers, but you leave me no choice. Now take off those big boy pants and underwear so Mommy can stick this diaper on you. Oh, now don't start crying like a little girl, or I will have to go out and buy you the pink diapers and frilly rumba panties... is that what you want? I can turn you into my little baby sissy girl, and throw out all your boy clothes and then take you shopping with mommy for some pretty pink dresses, yay! After all, you know mommy has always wanted a baby girl of her own.