Sksks so straight popular guy had sex with the other popular guy when he got really wasted after losing to him in a pageant of the hottest guy in school. The other guy (Natsu/uke) blackmailed him with a picture of when they were doing it. Proposed to be pretend lovers for a whole month, no cheating, and if natsu found someone he liked they could break it off
Iiko no Furi wa mou Yameru