Fluttershy has kept her little secret for too long. When her friend Twilight finds out about her habit, she feels more than obliged to trust her friend. As time goes on, the two friends discover more about each other than they might like to have known.
(Note: This story contains a decent amount of age play and other aspects of it)
Cover Art: http://derpibooru.org/tags/artist-colon-rocket+manatee