Not many humans no that haru is only fast at swim cuz he has ereaction ever time he see water and it accelerates him. haru's lover, makoto knew this because he has a haru boner sensor but the others don't.

'haru, i has ida for how you can beet REEEEEEEN at the next muscle competition SWIM competition' say machete

'how' say haru, fingering a mackerel.

'make you self explode your snake seed near the end for a quick final speed'

'ok'

It was the swim competition and REEEEEEN was giving haru sexy looks. 'i'm gonna whoop yo ass today, haru' say REEEEEEEN.

'yeah, ima beat you with my dick' say haru, honestly.

The gun went bang and the sexy underage boys drived into the pool. as soon as his penis touched the water it got hard and haru began using nagisa's trick and using it like a rudder. after the turn haru began wanking himself with one hand while swimming with the other. he exploded nearly instantly and his spunk made him shoot forward through the water and he one. REEEEEN came 2nd with a facefull of Haru offspring. he found it sexy. he wanked too. haru wanked again. makoto found it hot. he wanked. and nagisa. rei wanted to conform to social norms and began wanking too. the end.