In the dimly lit garage, a lone figure, Allmetalbassist, has created his own jerking machine for ultimate solo pleasure. The homemade device hums to life, stroking his throbbing cock with expert precision. He moans, his body tensing as the machine's rhythm intensifies. Beads of sweat form on his brow, his breath quickening. The machine's relentless pace pushes him closer to the edge, his cock pulsing with need. With a final, guttural groan, he explodes, his hot cum splattering onto the machine and his abdomen.