Haikyu!! dj - Unlogic

Pairing: Kageyama x Hinata

To keep his game up, Kageyama eats a lot of rice, does image training and doesn't masturbate a couple of days before a match. After Karasuno lost a game against Aoba Josai, Kageyama and Hinata decided to run while going home to get excess energy out.
But soon after, when they laid down on the grass, Kageyama got excited and revealed Hinata his masturbation secret which is why his body is now acting this way. They decide Kageyama can't go home like this and find a solution...

Reprinted in volume 5 of Okawari!!