(Knights Theory) [Snow Peach (Mipoko)] Naru no Anal kara Inspiration ga Waite Kuru zo (Ensemble Stars!)
(C78) [Kinokonomi (kino, konomi)] Kinokothical Theory (Various)
(COMIC1☆6) [Crazy9 (Ichitaka)] Zessica no Koufukuron | Zessica's Theory of Happiness (Aquarion Evol) [English] [biribiri + Doujin-Moe.us]
[INU] [Full Color Seijin Han] Furueru Kuchibiru fuzzy lips0 Complete Ban [Digital]
Crow (Theory of Heaven) - Honey Kami the 2nd vol.0.7
[Fuzzy Guard (Shiido)] Suki desu Jougasaki-san (THE IDOLM@STER CINDERELLA GIRLS) [Digital]
[Kakashi Asahiro] Hakase no Renai Kaizouron | A Professors Theory on Love and Sex Reassignment Surgery (COMIC Situation Play Vol. 19) [English] [4dawgz + thetsuuyaku] [Digital]
Innocence1 - Theory
Furueru Kuchibiru fuzzy lips0 Complete Ban
Futaba841 (Mitsuya Yoguru) - The Love and Pleasure Theory for Boys [ENG]