Set in the Sunsetverse

Sunset has been having problems due to being so much older then her friends, while Rainbow Dash is facing disrespect at work and a lack of alcohol due to being so much younger.

After the two discuss their problems, they come to the most obvious solution - Mess around with some old spells and magically alter their ages.

However with Princess Celestia performing a solar flare to celebrate the return of her sister, things might not work as expected...