Katie decided she was going to try the delicious looking cake covered in frosting. She pulled it out, and carried it to the counter. She set it down carefully.
She looked at the cake. It was made for a girl. The frosting was pink and white. It also said Happy Birthday Chelsea!
"I don't think you should eat that," Tiffany said.
"Why not?" Katie asked.
"Because it isn't yours," Tiffany said.
"I know, but it looks so good," Katie said. Katie grabbed a knife. Tiffany watched with wide eyes as Katie cut into the piece. Then Katie put the knife down.
Katie took the piece of cake and raised it to her mouth. She took one bite of the cake and then everything started changing.
Katie put her face into the big piece of cake and started to eat it. She didn't bother using her hands.
She didn't notice the rest of the changes very much. Katie's clothes disappeared. Then a large white diaper appeared on her. She felt a warmth spread from between her legs. The pee pooled in her diaper. Then the pee was pulled away from her skin by the diaper.
Then a pink shirt formed on her. It changed so two pieces of cloth went between her legs. It formed snaps, and snapped between her legs. She was standing in a onesie and a diaper that was wet.
Then Tiffany had a change. She became naked. Her boobs were suddenly a cup size bigger. Then milk started to come out of them.
Her belly started to expand. It expanded until she was six months pregnant.
Then, she started getting older. She kept getting older until she was 32 years old. She was still lactating, and her belly was still six months pregnant.
Then panties formed on her. A matching bra formed on her. However, this was a nursing bra. Then a pink t-shirt formed on her. Black sweats formed next.
She blinked and looked at the infantile dressed Katie. She had her head in the cake, and was eating away. "Katie! What on earth are you doing eating your sister's cake?!?" Tiffany asked in a demanding shout.
Katie jumped at this. She turned around to face Tiffany. She had cake all over her. It was on her face, hand and onesie.
Tiffany walked over and grabbed Katie by the ear. She was pulled to a chair where she was bent over Tiffany's knees. Her onesie was opened up, and her diaper was lowered.
Tiffany spanked Katie 25 hard times. Katie was crying after just five spankings. By the time she was done, Katie was sobbing.
Tiffany pulled Katie's diaper up just in time. Katie's body started messing diaper. Tiffany didn't mind. That was why Katie was diapered after all. She simply put the onesie back in place.
Then...