Blue Lotus, White Lotus by shions_heart
Nagisa, Makoto and Haru are stolen from their homes when they are children to serve under King Matsuoka. As they grow into adults, they face many difficulties, but also discover love, hope, friendship and the true meaning of loyalty.
This is an absolutely FANTASTIC read! I spent two days binge reading this fic and I loved every single moment. It has everything you could ever want from an epic fanfic, and I loved that the author stayed true to the canon characteristics of the Free! characters even though they were in an AU setting. shions_heart received inspiration from this gorgeous tumblr post:
If you're a ReiGisa, MakoHaru and/or SouRin fan, you will love this story! Highly recommended!
artwork credit: pixiv id 476111