Your pull up was intended to be temporary situation but you have not matured at all, despite your mature age and large size.

Constant messes have become a problem and your little pull up is no longer getting the job done, so MommyDomme goes out and buys you a big boy diaper. It's cute and you love it. You're super excited.
But, you're excitement gets you into trouble as usual.

I see that not only have you failed to act like a big boy in any way at all, but you have made a mess in the corner while I was gone.

Angry, I give you a hard and open han...

Your pull up was intended to be temporary situation but you have not matured at all, despite your mature age and large size.

Constant messes have become a problem and your little pull up is no longer getting the job done, so MommyDomme goes out and buys you a big boy diaper. It's cute and you love it. You're super excited.
But, you're excitement gets you into trouble as usual.

I see that not only have you failed to act like a big boy in any way at all, but you have made a mess in the corner while I was gone.

Angry, I give you a hard and open handed spanking until your fat ass turns bright red!
Even though you are a fat disgusting peepee bb, you're still my fat disgusting peepee bb. I comfort you, put your brand new fat ass diaper on you, and leave you alone on the floor enjoying the crinkling sounds now coming from your tushy.