The Sewer TF

THE TUNNEL

The tunnel doesn't appear on any official city map. It's a sealed section, forgotten by modern blueprints, hidden beneath layers of concrete and pipes that no one checks anymore. It's accessed through a manhole in an industrial area of the Bronx, near the river, where the buildings are abandoned and the streets are only used by cargo trucks. The manhole cover is rusted and heavier than it should be. When you lift it, a warm vapor rises with a smell of metal, moisture, and something else—something sweet and rotten at the same time, like fruit fermenting in a closed basement.

The access ladder is covered in black mold and slippery under your fingers. It's about fifty feet to the bottom. The tunnel itself is a reinforced concrete cylinder, about ten feet in diameter, with walls that constantly seep water. The floor is covered by a layer of stagnant water about four inches deep, dark brown, opaque, with debris floating in it: leaves, plastic, dead rats, and an iridescent film that breaks and reforms with every step. The air is thick. It smells like rotten eggs, like sewer, like industrial chemicals no one should be breathing. Rusted pipes run along the walls like veins, dripping liquids of colors that shouldn't exist. Some are broken. Others vibrate with the passage of something that isn't water.

The lighting is minimal. Only the inspector's flashlight cuts through the darkness, and the beam reveals particles floating in the air—dust, spores, and that iridescent gas that shines like oil when the light passes through it. The gas isn't visible to the naked eye. It has no color of its own. But when the flashlight focuses on it, the air itself seems to move, to ripple, as if it were alive. It's denser near the floor and accumulates in the areas where the tunnel narrows or curves. There's no ventilation. No air currents. Just silence, the constant dripping, and the echo of your own footsteps.

The tunnel extends farther than it should. The blueprints say it's three hundred feet to the next exit, but the passage goes on and on, curving in on itself, descending slowly. There are marks on the walls—scratches, symbols painted with something that isn't paint, remains of melted candles in makeshift niches. Someone was here before. Someone left things behind. Someone didn't make it out.

At the deepest point, where the tunnel widens into a small, round chamber, the gas is thicker. The air glows. The skin begins to tingle. And there, in that place where the outside world feels like a distant memory, is where the transformation happens. There are no witnesses. No help. Just the sound of dripping water, the distant hum of pipes, and the accelerated heartbeat of a heart that won't be human for much longer.

EFFECTS OF TUNNEL GAS Tunnel gas is colourless in the air, but glows with an iridescent sheen when direct light passes through it. It has no odour of its own; what is perceived is the dampness, rusty metal and decaying matter surrounding it. Once inhaled, the gas enters through the nose and mouth, travels down the throat and dissolves into the bloodstream in a matter of seconds. There is no immediate burning sensation or pain. Just a feeling of warmth rising from the chest, as if someone had lit a burner inside the body. From there, the transformation takes a different course depending on the person’s sex. If the person is a man: The first symptom is a tingling sensation on the skin, as if thousands of tiny needles were running down your arms, legs and back. Your clothes start to feel tight. Your muscles tense, swell and reorganise themselves. In some cases, before the body has fully adapted, a random change of sex may occur: the shoulders narrow, the hips widen, the chest softens and fills out, and the voice becomes higher-pitched. If that happens, the process continues from that new starting point. If it does not happen and the man remains a man, the transformation proceeds all the same. Scales begin to emerge from the skin, first as small, shiny patches on the chest, arms and neck, then spreading like a slow-burning fire across the entire body. The human skin cracks, peels away in shreds, and beneath it new skin appears: thick, pebbled, dark green and charcoal grey. The spine arches forwards with a wet crack. The facial bones lengthen. The nose merges into a broad, rounded snout. The teeth become sharp, jagged, and push against the lips. The eyes turn a deep yellow, with vertical pupils that contract and dilate uncontrollably. The hands widen, the fingers shorten and thicken, and dark, curved claws emerge from their tips. The feet transform into broad, scaly paws, with three thick toes and claws that scrape the ground. The back becomes covered in hard scutes. A thick, heavy tail sprouts from the base of the spine, growing in a matter of seconds to reach almost a third of the body’s total length. And between the legs, the body develops a large, scaly, heavy and sensitive penis, which hangs down between the legs and forces the creature to walk with its legs further apart. His voice becomes a deep, hoarse growl. The man is no more. In his place is a three-metre-long anthropomorphic alligator, confused, frightened, and acutely aware that there is no turning back.

If you are a woman: The first symptom is a deep warmth in the lower abdomen, as if something were twisting inside. Your clothes start to feel tight. The breasts swell first, straining against the bra or shirt, and the nipples become sensitive, almost painful. The hips widen with a dull crack, and the bottom rounds out and grows larger, pressing against the fabric. Scales begin to appear on the skin, first on the arms and neck, then on the chest, belly and legs. The human skin cracks and peels away, and beneath it emerges a new skin: thick, pebbled, dark green and charcoal grey. The spine arches and lengthens. The face stretches into a broad, rounded snout. The teeth become sharp and jagged. The eyes turn a vivid yellow with vertical pupils. The hands widen and dark, curved claws sprout from the fingertips. The feet transform into broad, scaly paws. A thick, heavy tail sprouts from the base of the spine and grows until it drags along the ground. But the most profound change takes place within. The woman’s body becomes more sexual: her hips widen, her bottom becomes large and heavy, and her breasts grow large and scaly with green nipples. Her libido skyrockets to uncontrollable levels. Her skin becomes extremely sensitive to touch, to heat, to the slightest caress. Desire becomes a constant, urgent need that cannot be ignored. Her nipples remain taut and sensitive, and the area between her legs burns with a constant dampness that never subsides. Every movement, every brush of her own thighs, every vibration from the floor, sends a jolt of pleasure that leaves her trembling. Her voice becomes a deep, hoarse growl, yet softer than a male’s, with an almost purring tone when she is aroused. The woman is no longer there. In her place is a three-metre-tall anthropomorphic alligator, confused, frightened, and with a body that demands things of her that she neither understands nor can control.