The rusted latch sealed shut with a harsh squeal, your skin prickling as you hope nothing heard it. Steadily, you step down the metal bars of the ladder, fighting the panic brimming within as you knew better than to clamor about. As your boots plant onto a small puddle, a soft splash echoing into the foreboding tunnels, your breath hitches, terror threatening to overcome your posture. Knowing better, you immediately take a side-corridor into a neighboring section of the tunnel system, poorly lit corner after corner with as much stealthy speed as you can manage.

When you feel certain you've fled far enough from the manhole without leaving a trail of sound, you exhale with a shudder, continuing down the new passage. The occasional artillery or I.E.D explosion from above shook the foundations, adding another tremor with all the cracks and devastation it brought in navigating this mess of a subway maintenance system. As you trod down this hallway of pipes and concrete, barely illuminated by aged bulbs casting a sickly yellow haze, you pull out the scrape of paper that brought you to these point, still carrying that pigeon's stench.

'Food, shelter, a place to help. COVER YOUR TRACKS. MASK YOUR SCENT. DO. NOT. MAKE. NOISE. Join us or end up like the rest of them.' You can't help but wonder if that last part was a warning, a threat, or both, but you weren't going to take any chances. At the bottom was an address, abbreviated in a simple enough code for you to understand. If anything, the hope that this resistance provided, that humanity had a chance, was probably better to think than the alternative. Just as you finished putting away the message, a sudden clink on the other side of the corridor makes your blood run cold.

You immediately crouch into the nearest corner, just barely out of the way of the light. Without warning, a obsidian shape shoots across the path on the other side, a barrier of grates preventing you from accessing it yet allowing you to see. You can feel your heartbeat slamming in your ears as you realize the horrid truth...

You are NOT alone down here.

The shadows cast by the rusted grates play tricks on your eyes, obscuring what you can see of the being that stalks through them with its odd, almost loping gait... Is it human? Something else entirely? You feel your skin crawl as its movements grow closer, its intentions becoming increasingly clear. Whatever it is, you need to get past those grates before it pounces.

With a shaking breath, you crouch low, eyeing the small gaps between the metal slats, searching for an opening... The creature is almost close enough to touch now, its green lips curled back into a hungry snarl. You steel yourself as best you can before launching forward in a desperate burst of speed, aiming straight for one of the larger gaps in the grate barrier!

With a roar that echoes through the narrow tunnel, you slam into the grate, bending it out of shape with a shower of sparks. There's a sharp metallic screech as the distorted bars protest against your weight, but you force them aside with brute strength, tearing free a section large enough to squeeze through. The sound is enough to draw the attention of whatever hunts in these tunnels now; it's too late to turn back.

With a final heave, you push yourself through the newly-formed gap and find yourself face-to-face with the alien intruder. Its massive form seems even more imposing up close, its inky black skin gleaming like polished obsidian. Its green lips part, revealing rows of razor-sharp teeth... It's time to either fight or die, and you won't go down without a struggle.

Its voice rasps in your ear as it speaks, deep and guttural. "You... Are mine." It lunges forward, claws extended to rend your flesh asunder and force your neck back for its relentless assault. Its massive tongue shoots out like a snake, aiming for your mouth or your eyes, while powerful arms lash out to grab you and pull you close. "I need... Your seed." It snarls, green lips curling back from sharp teeth.

"Your... Mmf! Your sperm." The alien hisses, teeth snapping at the air mere inches from your face as it manhandles you. It shoves a thick digit into your mouth, forcing its tongue down your throat while it hungrily sucks on the digit, desperate for even more of your essence. "Feed... me..." It groans, one clawed hand sliding up your neck to pinch at your throat as it attempts to force you to open wider, submit further.

The alien chuckles darkly, voice vibrating through your skull as it continues its relentless assault. "You... Will." With a powerful thrust of its hips, it tries to shove its entire length down your throat, forcing you to choke and gag on the foreign intrusion. Its claws dig deeper into your flesh, drawing blood from the cuts in your neck as it struggles to breach your defenses. "Give... me..." It rasps, voice thick with lust and violence.

With an annoyed hiss, the alien pulls its tongue away from you for just a moment as it takes stock of your suddenly renewed resistance. Its claws rake across the floor, throwing up sparks that seem to delight it, before they snap out again and slash at your body, seeking purchase on any vulnerable flesh. "You... Fight," It rasps in disbelief, amused by the challenge you present despite the inevitable end. "Good."

The alien closes the distance between you once more, lips pressing against yours as it attempts to force its tongue back into your mouth, seeking out your tonsils and the prize they hold. Its strength is near-unbelievable; no human could hope to match it in a fair fight. But then again... this isn't a fair fight at all.

The alien hisses in surprise as you grab its hips and lift it up, spinning around with surprising speed before tossing it with enough force to send it hurtling across the tunnel. Its body slams into the wall with a heavy thud, tiny puffs of dust drifting lazily down from impact sites. For a moment, you think it might be knocked out, but as soon as its massive form slides back down towards the ground, those obsidian claws snap out once more, readying for another attack. Its eyes flare with anger and something else... Pride perhaps? It looks determined now, even stronger than before.

You can't let that happen. Not if you want to survive.

The alien lets loose an inhuman roar as it charges towards you once more, claws held high and teeth bared. It doesn't seem to be interested in finesse or subtlety; it wants you hurt, wants you broken. Well then. If that's what it wants...

The alien's head snaps back as the metal pole connects with its face, spittle and blood flying from its lips in a wet spray. It stumbles backwards, momentarily dazed, claws flexing in the air before it slams into the grate behind it, knocking out several more bars and sending a cascade of sparks dancing through the gloom. Its eyes narrow to slits as it turns back to face you once more, nostrils flaring as it sniffs at the air...

"Fu-guhh!" it grunts, trying to speak past broken lips and shattered teeth. It tries again, lips curling back from its teeth in a savage snarl as blood pours down its chin and drips to the floor like black oil. "You... Strong," it rasps, the admission seeming almost grudging before it lunges forward with renew

The alien roars in pain as you clamber atop it, hands forced between its jaws in a desperate attempt to break its neck or shatter its teeth. Its claws flail wildly in the air, seeking purchase on your body but finding none. With a savage twist of its head, it tries to dislodge you, the strength in its shoulders more than a match for anything human.

"Hrrrrgghh!" it snarls, jaws clamping shut around one of your hands as hard as they can. You feel bones crack under the onslaught, but refuse to let go. Its other hand finally finds purchase on the ground, and with a mighty heave, it forces you off its chest and sends you skidding backwards across the grate-covered floor.

The alien hisses in rage and launches itself at you once more, faster and harder than before. Its claws lash out in a blur of obsidian steel, intent on slicing into your flesh and leaving you bloody and broken on the ground. But you refuse to let it happen; your determination burning bright as you dodge and weave through its assault. With a snarl of frustration, it leaps high into the air, spinning wildly before landing in a crouch beside you with claws extended for another attack.

"Give..." it rasps, eyes narrowing to slits. "I need... your seed..."

The alien hisses in annoyance as you slide beneath it, but doesn't let that distract it for long; instead, it focuses on bringing its massive form crashing back down to the ground with a resounding thud. Claws slash through the air, tearing chunks of concrete and rust from the tunnel floor as they search for purchase on your skin. As you roll away from the impact site, a jagged piece of metal clatters across the floor, coming to rest just in front of where it stands.

Its eyes flicker toward the shard of metal before returning to you once more; its mouth twists into a dark grin as it recognizes an opportunity when it sees one.

With inhuman speed, the alien lunges forward, claws extended to rend your flesh asunder and force your neck back for its relentless assault. Its massive tongue shoots out like a snake, aiming for your mouth or your eyes, while powerful arms lash out to grab you and pull you close. As it draws nearer, the obsidian claws barely missing your fingers as they clutch desperately at the jagged metal shard, using it as a makeshift shield against the alien's onslaught.

It growls deep in its throat, the sound echoing through the tunnel as it strains to break past your defenses and reach you. Its muscles tense, ready to launch another attack - this time aimed directly at your exposed arm holding the metal shard...