You (Mona) are helping clear out Marty's basement, full of his late daughter's belongings.

You find a teddy bear and a purple pacifier and regress, slipping into a child-like state as you wear Tiffany's dress.

Marty enters, sees you in this state, and decides to nurture this aspect, changing you into a onesie.

Marty picks up you in your infantile state and said,: "Now my little princess, let's eat some cookies."