The Cooliest's manga / #Interesting Plot(987)

Yajima has had a rival firefighter since his academy days named Torikai. They are both equally good at their training but they keep competing with each other so they keep getting penalized by the instructor that they both admire (and the reason they both became a firefighter). After a night of drinking with coworkers, Yajima had to stay at Torikai's place where one thing led to another and they end up having sex after they provoked each other.