| Universes | Series | Writing Events |
|---|
| Series | Author | Story Count | Updated | Change | |
|---|---|---|---|---|---|
| 1 | U Stories | Mat Twassel | 6 | Added 'Underwearless' | |
| 2 | Uncle Bob | Lubrican | 49 | Added 'Jilted Niece' | |
| 3 | Uncle Dan | RonBo | 2 | ||
| 4 | Uncle Dave | Ava G | 3 | Added 'To the Candlestick Fence, Tranquility, and Beyond' | |
| 5 | Uncle Dave's close family ties | Uncle Dave | 3 | Added 'The Family Gathers' | |
| 6 | Uncle George: Adventures in the Philippines | George Foxx | 13 | Added 'Playing House With Uncle George' | |
| 7 | Uncle Walter | Sly Dog | 3 | Added 'My Valentine' | |
| 8 | Undiscovered Countries | hammingbyrd7 | 3 | ||
| 9 | Unfinished On Purpose | autoeroticrobot | 4 | Added 'Grandpa's Edge' | |
| 10 | Unit Taffy 3/Detroit | Paige Turner | 4 | Added 'Taffy 3 Part One, Scene 1: "Jack's Having a Bad Morning' | |
| 11 | Unleashed Wives | INtrinSicliValud | 3 | ||
| 12 | Updated Nursery Rhymes | Mat Twassel | 15 | Added 'T a N G O' |