Suddenly Cassie looked up.
"Transform or dare?" She said
Rachel looked at her a few seconds before saying what.
"Too much time you get both, for your dare you will wear diapers for four hours every two days of which I choose the time, you will be able to use the bathroom during this time.Now for your transformation, firstly you will become my twin sister. Secondly if you wet yourself during the time you are wearing the diapers first you will regress 2 years, at 16 you will start to regress a year, and at 13 you will regress by 6 months. For messes you will regress 3 years, at 14 that goes to a year and all the regression will stop if and when you reach the age age of three. I also will have the right to stop the transformation at anytime.
Second you clothes will change based on your age when you are not wearing the diapers, for example if you become 14 you will have the clothes of a 14 year old. Reality will change to fit your age only me and you will remember are old self we will also gain the new information from the new reality.
Suddenly Cassie look at her.
"I want to start wear your diapers now, sis."
Suddenly Rachel looked down to see her panties starting to get thicker and soon she was wear some diapers along with her sister.
Then see got a look of dread on her face and started to run up the stairs. She got halfway up the stairs before she stopped. Then Cassie looked and saw her sister shrink a little she now knew she had a younger sister of 18 years old. Rachel came down will a defeated look and a wet diaper. Cassie changed her and found she had diapers around the house. Rachel just sat down realizing that she still had over three hours to go and she could get a lot younger.