Every Friday I take the initiative to search through thew newly free titles on Amazon, and to identify those that might be of interest to trans* readers, fans, and lovers. Even if you don't have a Kindle, you can still download the titles through one of Amazon's free reading applications, and covert it (if need be) with Calibre. I can tell you I do most of my reading on my tablet, using Kindle for PC, and it works beautifully.
Please do be sure to check the price before downloading anything, though, as most freebies are limited time offers, and some are specific to certain regions.
Love or Lust?
The Timer (BDSM Erotica)
The Rough and Naughty Interrogation
Taboo Futa Science Experiment (Futanari Fantasies)
Massaged by the Futa (Futanari Coach 1)(Futa-on-Female, Massage, College, Teacher/Student, First Time Erotica)
Step Into Temptation: But He's So Pretty
Ed & Tracey: A crossdressing romance
Swapped By A Ghost: An Erotic Halloween Taboo Gender Swap Story
Gender Bender Bundle!: Futa Gender Swap Fetish Trans Taboo Erotica
The Snake In The Skirt (The Witch In The Corner Office Book 1)
Debbie and Her Ladyboy: Chocolate Candy (Robins Exotics Erotica series Book 12)
The Ladyboy and Her Women Trilogy (The Jackson Ladyboy series Book 2)