While the purpose of this archive is to offer baby and kidfic, I know there's some interest in fics about William as an adult and other adult offspring of our beloved agents too, so here's a list of some of them. Most can be found at Gossamer.
William as an Adult
25 Years by XxaerogirliexX
2012 by angelofjoy
Ad Aeternum series by Julie Jekel
Another Fond Memory by Spock
At Sunset by Oracle
Badlands by J.S. Michel
Beautiful by Gauri
Betrayal and Absolution by Mary Kleinsmith
Boy X by Meredith
Cafe Confessions by Rae
The Clandestine series by harperrose87
Cotton Wool by Neoxphile WIP
The Crouching Thing by Sarah Ellen Parsons
The Cycle Begins Anew by Thornedbud
Dad by Faith
Early Morning Call by Myriss
18 years and 1 day by Starbuckmsr
Every Single Day by Angela C. Wettergreen
Fragments - In Memoriam by XSketch
A Fine Boy by Cara Taylor
Five for the Price of One by Sarah Segretti
A Fond Memory by Spock
Gentle Christmas by Susan
Ghost Lights by Neoxphile
Graveside Questions by Rae
In the Attic by Abra Elliott
Lost Highway by Jinx451
My name is William by PamalaSt
One Day by Myriss
Our Son, The Doctor by AdventureGirl6
(this fic at fanfiction.net)
Quiet Christmas by Susan
Resistance by clone1121
Shelter in a Time of Storm by David Stoddard-Hunt
Son by Squishy
Sins of the Fathers by TangledAria
Spring in Pride Creek by Elsie
Still Out There by revery
Their Fondest Memory by Spock
Thy Mother's Glass by Lazuli Kavanaugh
To Have And To Hold by Deia
To Never Know by Agent Spooky
Tuebor by Slippin' Mickeys
Them by Neoxphile
Us by Neoxphile
White Christmas by Susan
William 2022 (a graphic novel) by Alien Girl
http://web.archive.org/web/20050114095242/http://www.geocities.com/william2k22/
Wish William by XSketch
Wonder Years by Billie Reid and Kyouryoku Senshi
Fics in which William is grown up by the end:
For the Good of the Child by Aislinn Carter
You Should Be Proud by Faith N.
Anamchara by Catherine Earnshaw
And Whispered I Love You by Mystic
The Beatles Files by Christina Shuy
Butterfly Kisses by Julie BurnhamThe Faith series by Nynaeve
Good-byes by Paula
Generation: Next by Lisa McKensy
Generation: Next II. Ten Months by Lisa McKensy
Heart, We Will Forget Him by Trinity
Misunderstood by David Hearne
Namesake by Jessica Zyvarek Taylor
Reinventing the Future by Lilith
Reinventing the Future II: Asunder by Lilith
The Sarah series by Carol Gritton and Patty Hayes
A Sleepy Little Town series: Free Fall by Neoxphile
Reunion At the Tiburon Cafe by Shahara Z.
Their Father's Murderer by Kathinka
A Thimble For Peter III - Back Through the Window by S. Anderson and Cheryl DeLuca
Tower of Song by David Hearne
Treasures by Linda Phillips
Twilight by David Hearne
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