Mai-Multiverse and ShizNat Webs http://ltahime.forum-motion.net/forum

And their sister-site; http://shiznat.webs.com/

They work on ShizNat doujinshi! Obviously. Release threads can be found on their forum, under the General ShizNat section. They also offer other language options for some releases.

July 2017
Swimsuit by Ayanero Taicho Mai Hime Doujin released Jul 24 '17 Full color NSFW Shizuru x Natsuki Swimsuits Yuri
June 2016
Doropanda Tours Vol. 11 by Nanzaki Iku Mai Hime Doujin released Jun 6 '16 NSFW Shizuru x Natsuki Yuri
May 2014
Mercy ch06: Mercy by CrimsonSummer Mai Hime Doujin released May 30 '14 Aaaaaangst Drama Read left to right Romance Shizuru x Natsuki Yuri
February 2014
A Lily Kisses a Rose by hoimin Mai-Otome Doujin released Feb 17 '14 Dark skin Laura x Rosalie NSFW Yuri
January 2014
Going Forward by Logical Zero Mai-Otome Doujin released Jan 13 '14 Drama Mai x Natsuki Shizuru x Natsuki Yuri
Let's Do it by ??? Mai Hime Doujin released Jan 3 '14 Lots of kissing Shizuru x Natsuki Yuri
Doropanda Tours Vol.12 - Toriko Shikake to Yasashii Kemono by Nanzaki Iku Mai Hime Doujin released Jan 1 '14 Ecchi Shizuru x Natsuki Text Yuri
December 2013
Natsuki X Blade by ??? Hayate x Blade Doujin and Mai Hime Doujin released Dec 30 '13 Crossover Shizuru x Natsuki Yuri
Shizuru Dog by ??? Mai Hime Doujin released Dec 29 '13 Comedy Shizuru x Natsuki Yuri
Shizuru-Fujino1219@ by ??? Mai Hime Doujin released Dec 29 '13 Birthday Shizuru x Natsuki Yuri
I Want To Be Kissed by ??? Mai Hime Doujin released Dec 28 '13 Shizuru x Natsuki Yuri
August 2013
Mercy ch05: Death Is Your Wish II by CrimsonSummer Mai Hime Doujin released Aug 26 '13 Aaaaaangst Drama Read left to right Romance Shizuru x Natsuki Yuri
April 2013
Mercy ch04: Death Is Your Wish by CrimsonSummer Mai Hime Doujin released Apr 15 '13 Aaaaaangst Drama Read left to right Romance Shizuru x Natsuki Yuri
March 2013
Mercy ch03: Constant by CrimsonSummer Mai Hime Doujin released Mar 13 '13 Aaaaaangst Drama Read left to right Romance Shizuru x Natsuki Yuri
February 2013
Mercy ch02: The Darkness by CrimsonSummer Mai Hime Doujin released Feb 7 '13 Aaaaaangst Drama Read left to right Romance Shizuru x Natsuki Yuri
January 2013
Mercy ch01: Awakening by CrimsonSummer Mai Hime Doujin released Jan 17 '13 Aaaaaangst Drama Read left to right Romance Shizuru x Natsuki Yuri
March 2011
Toilet by ??? Mai Hime Doujin released Mar 17 '11 Shizuru x Natsuki Yuri
February 2011
Wink by ??? Mai Hime Doujin released Feb 2 '11 Blushing Shizuru x Natsuki Yuri