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The manhole cover creaks open, revealing a glimpse of the forbidden below. The bisexual male, alone and curious, lowers himself into the darkness, his heart pounding in his chest. His hand reaches out, touching the smooth, cool surface of the tunnel wall, his fingers tracing the grooves and ridges. His mind races with images of what could be hidden in the depths, his cock hardening at the thought. He moves deeper, the sound of water rushing around him, the scent of damp earth filling his nostrils. His hand wraps around his cock, stroking it slowly, the sensation heightened by the taboo of his location. He leans against the wall, his breath coming in short gasps, his body tensing as he nears the edge. With a final, desperate thrust, he comes, his seed splashing into the water below, his cries echoing through the empty tunnels.