Shuichi makes a weak argument and Kokichi's plan goes through.

Shuichi grit his teeth, then attempted to raise his voice to get attention. There were a million good reasons not to let this go ahead, but he was struggling to settle on one and fine-tune his argument. "Look, this stuff is... W-we don't know what it is! You can't just blast it off and let it into the drainage with everything else! Who's going to take responsibility when it clogs?"

Kokichi frowned and kicked his feet, as though he was ashamed of himself. "I'm sorry... I just wanted to help everybody out. I didn't even think about the environment, or my responsibility as a student and a citizen... Himiko, Tenko, can you ever forgive me?" The boy easily summoned tears to his eyes, holding the hose tightly and looking about five years younger than his ordinarily young look.

Himiko exchanged a look with Tenko. "I kinda think staying in this stuff is a bigger crime against nature, nyeh. I don't wanna think too hard about it... Let's just do it."

"Indeed! Let's wash away this filth now, and then we'll pray that God can forgive Shuichi and Kokichi for the horrifying ecological disaster they've created."

"You guys are so nice... and smart," Kokichi sniffled the first part loud, but slipped into a bit of smugness with his last words. "All right! Tenko, do you mind holding on to this part? Himiko would probably appreciate it if you washed her down."

Tenko bought into that instantly. "Not a bad idea, for a degenerate!" The martial artist swiped the hose, then gripped it tightly with excitement. "Just stand still, Himiko, and I'll thoroughly clean every inch of you."

"... J-just enough so I can use the shower in the locker would be fine, nyeh..."

Shuichi realized with some annoyance that Himiko probably realized something was up here, but was too lazy to muster the energy to stop it or even think about what it could be. He looked over at Kokichi to see the boy's eyes curling into knowing crescents.

As Kokichi placed his hand on the faucet's key, he spoke in a lower voice meant only for the detective. "This is one you owe me. I'd hate to see you waste an opportunity by lying to yourself and pretending to be a boy scout, okay...?" With speed preventing any interception, the smaller boy turned the pressure up.

The detective had failed to stop him, and now he was sure he was about to see what he couldn't believe no one else had thought about: they were about to reveal their naked bodies, and K1-B0 was still recording. Kokichi was acting like he was doing this for the detective's benefit. Could that possibly be true? And if so, should he be flattered, or disgusted? Shuichi couldn't help but suspect the habitual liar... Although there were two cute (if eccentric) girls present, Shuichi somehow got the feeling he was the main subject of that recording.

Anyway, if it had come to this, it was every man for himself. He'd dodge the hose, if he had to...

Something told Shuichi he hadn't seen through to the full depth of Kokichi's plan, and that now that it had come this far, it was too late to stop it.