I had only recently discovered 8M when it went down so I had a lot of browser tabs open with a lot of history that I could go back and forth with.
From that I made an author list with their different types of genre. From that list here is a list of authors that had Cross-Dressing/Feminization/Sissy associated with them to help you find and regenerate this material. Several of these authors have been populated so far, hope this helps.
Abbe Benz [Femdom / Sissy / Chastity]
Alessandra de Lyte [Femdom / Sissy / Chastity]
Aurora Sparks [Sissy / Crossdressing]
B.A. Queen [Feminization / Crossdressing / Sissification]
Betty Cross [Sissy / Feminization]
Bobbi Mare [Sissy / Feminization]
[Sandy Thomas Publications + Carole Jean Presents eBooks] Petticoat Punishment/Sissy/Crossdressing Stories
Carry Cockburn [Feminization, Sissy, Femdom, ect]
Charlie Quinn [femdom, feminization, chastity, cbt, cuckolding, gay]
Christina Shelly [Crossdressing / Forced Feminization / Shemale Submission]
Constance Pennington Smythe
Diane Woods [Transgender]
Esther Harshom [Femdom / Sissy / Chastity]
Eva Fox [Femdom / Sissy / Feminization]
Gia Maria Marquez [Sissy, Cross dressing, Futa, ect]
Hellen Heels [Femdom / Feminization]
Janice C Parker [Sissy Maid]
Jessica Whip [Femdom / Feminization / Sissy]
Kirsten Mathews (sissy/sissy maid)
Lisa Farrow [Feminization]
Maid Dee (femdom/feminization/sissy)
Melissa Miranti [Femdom / Feminization / Chastity]
Mistress Deb [Femdom / Feminization]
Mistress Dede [ Sissification / Feminization ]
The Feminization Station: Caption Stories by Nikki S. Jenkins - which I think this thread owner will probably start a thread for
Pearl N. Lace [TG / Futa / Bimbo]
Phoebe Pearl [Sissy • CD/TV/TG]
Rae Robinson [Femdom • Sissification]
Rex Haltier [Trans Erotic Romance]
Robbie Gold [Sissy - Bdsm - Lezdom - Femdom]
Scarlet Virino [Sissy • TV/CD]
Verity Black [Sissy • Feminization • FemDom]
These additional authors already have threads here
[Sick Puppy Press eBooks] Joe Six-Pack Publisher of Transgender/Sissy/Crossdressing Stories
Ann Michelle [Feminization / Cuckold]
Aimee Allison [Sissification / Domination]
Ashley Natter [forced feminisation, sissy, gay, animal lover]
Cashmere Chloe [TG, Feminization, Crossdressing, Gender Change]
D.L. Savage [Feminization]
Eric Filler [Gender Swap]
Henrietta Soto [Femdom / Feminization]
Honey Wells [feminization/femdom/chastity]
J. A. Dolan [Crossdressing / Futa]
Jo Santana [Feminization / Chastity / Crossdressing]
Keary Hayes [CD/TV/TG • Feminization • Sissy • FemDom]
Kelly Maitland [Femdom / Sissy / Feminization]
Kitty Williams [Femdom / Feminization]
L.M. Gregory [Sissy / Body Swap / Feminization]
Lady Alexa [Femdom / Feminization]
Lana Ellis [Feminization / Sissy / Femdom / Chastity]
Lara Longstaff [Shemale / Futa]
Lily Fey [Gender Swap] [Feminization]
Lisa Change [Gender Swap]
Lyka Bloom [TF, MC, TG]
M.missy books (femdom/spanking/sissy maid/shemale/feminization
Martha Z. Kleine, Forced Feminization, Female domination, Enforced Male Chastity, Cross Dressing
Natalie Deshay [Sissy • TV/CD • FemDom]
Nikki Crescent [Gender Swap • Feminization • Sissy]
Paul Zante (feminization/sissy)
Rebecca Sterne [TV/CD Sissy Feminization MtF]
Sabrina Jen Mountford [Sissification / Domination]
Tiffany Chastain [Feminization]