Riku and Satoru, rough and ready construction workers, seek refuge from the sun in the filthy, concrete-block toilet stall. Riku, the more aggressive of the two, pins Satoru against the wall, their hard hats clattering to the floor. He unzips Satoru's pants, revealing a stiff, eager cock that he hungrily swallows. Satoru groans, fucking Riku's face as he grips his own hard hat for leverage. The sound of jackhammers outside only intensifies their raw, forceful blowjob.