Ikenai Hinata-kun

Hinata Koga, a university student working part-time at a karaoke place, is put in charge of high schooler and clubber Kai Kimura's training. As they're cleaning up one the karaoke rooms, Kai suddenly asks him, "You're gay, right?" Despite realizing that Kai couldn't possibly know of his orientation, Hinata ends up agreeing to a date so that Kai won't spread the word. Right afterwards, Kai makes a move on him, but then he suddenly adds the strange condition "not to fake pleasure"...!!??

(Source: Renta!)

Note: Includes an extra chapter.