You're my older brother, but your dick is smaller than mine! No wonder diapers suit you so well.

You idiot...don't look...

Ah! You must be getting excited. Look at the size your dick has grown to.

I wonder if the diaper will completely cover it?

Oh? You must be getting excited. Look at the size your dick has grown to!

Ah...no...

Here, here...

Because you're a good boy, won't you let me put this diaper on you?