EDIT: 3,500 views. STOP. READING. THIS.
Everypony has secrets, but some are more embarrassing than others. When Twilight reveals her desire to act like a mother for a day to Fluttershy, she has no idea what the pegasus has in store for her... or what she is about to propose.
A note of caution: this story contains voluntary ageplay and non-graphic diaper usage. As such, it's rated 'teen' for fetishy material but it's nothing too intense or objectionable. Cover image by rogeykun and used with permission.