Okeya http://www.pixiv.net/member.php?id=144048

Also known as OK Yeah, The Shakya, Arien, Oke, and theeshakya

Monthly RitsuMio For Adults - First Edition by Fukutarou and Okeya K-ON! Doujin released Sep 19 '12 Bath Blushing Lots of sex Mio x Ritsu NSFW Yuri
Monthly RitsuMio for Adults - Special Edition by Fukutarou and Okeya K-ON! Doujin released May 2 '13 Lots of sex Mio x Ritsu NSFW Yuri
The Mio Mio Mio Mio Mio x Ritsu Book K-ON! Doujin released Oct 2 '13 Clones Comedy Harem Mio x Ritsu Wishful thinking Yuri
August 21st K-ON! Doujin released Dec 10 '13 Mio x Ritsu Yuri
HEY!!!!! I LOVE YOU!!!!! FOREVERMORE!!!!! K-ON! Doujin released Aug 26 '14 Comedy Mio x Ritsu Yuri
Unforgettable Flowers and Rainbows K-ON! Doujin released Sep 25 '14 Mio x Ritsu Romance Yuri
Honey! ~ Yumikuri Anthology~ by Fukutarou, Kou, Okeya, Shakeda Mamoshirou, and Sora Attack on Titan Doujin released Jan 28 '15 Christa x Ymir Comedy Yuri
MioRitsu for Adults - Rebellion Story by Fukutarou and Okeya K-ON! Doujin released Feb 25 '15 Lots of sex Mio x Ritsu NSFW Reversal Romance Yuri
January 15th K-ON! Doujin released Jul 20 '19 Birthday Blushing Mio x Ritsu Yuri
Valentine's RitsuMio K-ON! Doujin released Jul 30 '19 Blushing Comedy Mio x Ritsu Reversal Valentine's Yuri
Hito no Nozomi no Yorokobiyo Love Live! Doujin released Sep 23 '20 Eli x Nozomi Yuri