Darling manga + drama cd. The author is Ougi Yuzuha. Volume 1, Chapter 1, Part 1. This video contains yaoi, which is boyxboy or gay romance.

Rio was living a perfectly normal high school life, when transfer student, Tomo-chan, entered his school. Rio watches as Tomo easily grabs the attention of the female student body. It's not until Tomo picks up Rio's dropped planner with a picture of his beloved idol, a male teacher, that they interact. Suspecting that Rio is gay, and after stating that he's going to "cure it" Tomo enlists in a "Homo Fixing Training Regimen."