"Mom, can I be your little sister?" May asks, liking the idea of being a little sister, even if it was for a little bit.
"I love that idea. I never had any siblings. That would be so much fun." Morgan says.
"I don't wanna become too young, though." May says.
"Go down to 9 or something like that." Morgan says.
"9 it is." May says, concentrating on becoming 9-years-old again. She felt herself no longer taller or even eye level with her mother. May was dropping from her 5'11" height, as she soon entered her mid-teens. May could really feel the height difference now. She was soon out of double digits, and at her target of age 9. Her clothes morphed into a pink long-sleeved shirt, orange shorts, pink over the calf socks and pink shoes. May looked underneath her shorts and saw that her plain white panties were the same, but smaller to fit. She looked under her shirt and saw a training bra. She felt her chest and it felt tender. May then remembered a trip she went on with her friends when she was 9. During the trip, she noticed that her chest felt different and sought out the mom she was with, who explained a lot. May certainly made her friends jealous for the rest of said trip, knowing her breasts were already developing, and then remembering she started having periods the following year(her first during school after spring break, that was embarrassing). Morgan was very surprised when she learned how early her daughter was developing.
"Oh, May. I recognize that cute face." Morgan says.
"Oh, Mom." May says.
"Call me Morgan. After all, we are sisters right now." Morgan says.
"Mom, can I have a piggy back ride?" May asks.
"Hop aboard." Morgan says. As she bends back to let May on, her skirt slips down a bit, revealing her black panties. May hops on and Morgan holds her legs.
"Thanks, sis." May says.
"Don't mention it. Big sisters should always give their little sisters piggy back rides." Morgan replies. They look around the resort, wondering what to do next.