You were playing truth or dare with Kageyama, Tanaka, Kiyoko and a couple other friends from the volleyball team.

You goy a dare to sit on Kageyama's lap for the whole game, not that either of you minded.

As you continued playing the game, you kept on slightly moving and turning.

Suddenly Kageyama's breathing grew heavier, and his hands grabbed your waist, as he pressed his forehead against your back to hide his red face— he got a boner because of your moving.