"I think it's a good idea. But I think it would be more fun if we were both two years old." Rebecca replied.
"Are you sure? Wouldn't you like to be the older sister and I the younger brother?" he offered again wanting to help her out.
"Thanks but no thanks little bro. I want us both to have fun as toddlers alike. Without one being older than the other."
He grinned at her and replied “Ok then.”
He grabbed his coin and wished he and Rebecca were two years old.
Instantly Rebecca started to shrink a bit to the point that she was the same height as Mark or even less. Also both her dress and her diaper shrunk so that it would still fit in her new age. When the transformation was over, Rebecca looked at herself to verify what she looked like right now.
And despite the fact that her appearance hasn't changed much, Rebecca was even more excited knowing that she could still be a diapered toddler for a little longer.
And immediately Rebecca gives Mark a huge hug.
"Thank you so much, Mark. You really are a great brother. And I can't wait to do all the things a baby likes to do with you."
Then....