(A collab with Latecomer, open to all authors. Stories should be SFW with some potential PG content, rated Teen to be safe.) A collection of stories involving various characters undergoing potty training, to varying results.
Daring Do was pushed her into a Fountain of Youth and was regressed into a foal. She then finds Ahuizotl (who was also regressed into a kitten). The two have to trek through the jungles of the Tenochtitlan Basin and find a way to turn back to adults
Dr.Whooves's time machine malfunctions causing him to regress into a foal and now has to go on a journey through time and space to turn back to normal.
(An indirect sequel to "Finding Shining" and "Finding Sunburst" by Foal Star.) Princess Cadence willingly turns herself into a foal to spend time with her daughter. But Cadence soon desires to have her own foalish adventure and slips away.
In order to destress, Princess Celestia takes a potion that allows her to briefly be a child again. Could Discord, Sombra, and Chrysalis possibly benefit from the same procedure?
(Story idea requested by superfun. Contains age regression, diapers, and diaper useage! Reader discretion is advised.) When Diamond Tiara and Silver Spoon lose a bet to the CMC, they are turned into foals for a week. The CMC must care for them.
Luna wants to go trick or Treating but Celestia is emberassed and decides its about time they stopped. Frustrated Luna turns Celestia into a foal and now has to care for her during the festivites.
Having embraced her inner foal for a number of months, Starlight's ageplayer side has been accepted by her mentor, childhood friend, and best friend. So what about what might be the source of these desires; her father?