In a cramped, graffiti-covered booth, a rebel teen, armed with headphones and a smartphone, blasts his favorite extreme metal track. His eyes roll back as he unbuttons, the heavy drums and distorted guitar riffs fueling his masturbation. The volume is so high, the music vibrates through him, his cock throbbing in time. His moans are swallowed by the ear-raping symphony, his body convulsing as he cums, his breath ragged, the music finally fading to silence.