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Standard adult entertainment warnings here: please be of adult age and not to be offended by homoerotic acts or adult fantasy. If you are alright with that, please proceed. Constructive comments, grammar correction, and thoughtful suggestions are welcomed.

Marching Through the Marsh

The commander was not happy about what the simulated voice kept repeating to him.

_Warning! Crash imminent. Warning! Crash imminent… _

“Yes! I fucking know. Reroute life support power to stabilizers upon atmospheric entry,” shouted the commander.

The lone marine watched the monitor in the escape pod plot his descent into the alien planet below. Commander Rawlins was really looking forward to some leave, but his transport ship decided to explosively decompress at the most inopportune time. He was able to get the small crew into the escape pods before the ship was destroyed. Their pods fell towards an uncharted planet. The scanners could only determine that the atmosphere could support breathable air.

The escape pod began to get a bit warm as it entered the atmosphere. The commander gripped the support handle in his pod as the act of entry shook the alloy walls violently. He heard a hiss as his orders kicked in and life support power drained into the stabilizers. Unfortunately, it didn’t help too much as he continued to fall too quickly. It felt like a long time falling as he only heard the pod’s alarm continue to beep as the temperature kept getting hotter. The walls continued to rattle before he felt the boosters fire before impact.

Rawlins woke up in his mangled pod. According to one of the hanging screens, it had only been half an hour since he crashed. As he pulled himself out of the escape pod, he could feel a sharp pain in both his legs. He groaned as he pulled out the emergency supply kit from the wall of the pod. He pulled out one of the med syringes and jabbed it right into his hip. The cocktail of painkillers and a precautionary antibiotic took the discomfort away almost immediately.

The marine pulled himself from the wreckage and took a good look around. He had landed in the middle of a large swamp, but he could at least see some hilly plains out in the distance. The vegetation took on more colorful hues of red and purple compared to the lush green he was used to seeing. The waters of the marsh before him spread out a few kilometers before hitting a tree line. The surface of the water was covered with a duckweed like plant that was vibrant red, with some spots fading to violet.

The grizzly veteran scratched his salt and pepper scruff and pulled himself out to stand on top of the wrecked pod. As he looked down, he noticed his uniform was torn up from the impact. Everything below his barrel chest was covered in tears and cuts. He recklessly tore off his shirt and hopped off the pod. He dropped down into the water, splashing up just above his waist.

Commander Rawlins grabbed a service pistol and checked the pod for anything else of use. There wasn’t anything else he could salvage. As he had turned away, a soft beep caught his attention. On a dangling monitor, an emergency beacon signaled out towards the tree line. The marine made it his immediate goal to make his way to another survivor. Rawlins began to trek across the alien swamp.

The two suns twisted around each other in the sky. Streaks of golden clouds speckled the blue atmosphere above. The heat was made worse by the humidity, but the marine simply ignored the conditions around him. The meds helped a lot, only blocking the sensation of discomfort without impairing motor functions. Unable to feel the sting of his cuts, Rawlins also failed to notice something gently brushing against his body below the plant covered waters.

Underneath the red weeds, flat slug like worms swam through the waters in droves. They appeared plump and milky white with a few black dots that pulsated as they contract and push themselves along in the water. They picked up the trace amount of iron from the commander’s blood and started to home in like sharks. The first of many reached his legs and started picked up on his body heat.

The alien wildlife had started to push themselves through the tears in the marine's pants. The first one found a cut on his inner thigh. The creature pushed a tip against the wound and with some minor resistance, its body began to produce a special slime coating before it started to squeeze itself past the skin. The lump in his thigh squirmed around before disappearing deeper.

Rawlins continued at a brisk pace across the marsh, maybe another two kilometers before he reached the tree line. Sweat soaked skin glistened against the two suns beating down on him. His broad, fur covered shoulders rolled one at a time with each stride. The commander was so focused on making it across that he didn’t notice the extra weight on his lower body.

By now dozens of the slug worms had stuffed themselves past his pants and began to migrate towards his waist. One by one, they entered through any opening they could find. Their plump bodies could contract into incredibly thin points as they pushed and squirmed their way into their new home. A particularly fat alien crawled across the commander’s sac. It began to inch across the base of the thick and flaccid marine cock.

The girthy creature started to push itself up to Rawlin’s hooded tip. It quickly found its way past the skin and pressed its body against his glands. It began to secrete more slime along its body as it found a tight opening. It stretched its body into a thin point and pressed right up against the slit. The fat body pulsed and disappeared inch by inch down Rawlin’s cock. More of the creature’s brethren pushed their way between the marine’s fuzzy cheeks. They pushed and slid their way right up his tight pucker with easy. More and more attached themselves to the human’s legs and began to assimilate his tissue.

Unable to feel what would have been a tingling sensation on the pleasant side, the commander didn’t notice anything unusual as his lower half began to change. Muscles and bones began to be replaced with something more flexible yet incredibly dense. Slowly the marine’s steps began to change. He didn’t seem to notice at all. The altered tissue started to affect the rest of the commander’s biology as the chemical alterations reached his bloodstream.

He started to slither across the swamp now, moving faster than before with his transformed legs. The remaining shreds of his pants and underwear tore apart as his dick became engulfed with a mass of creatures. Some continue to follow the first fat work down the marine's fat cock while the others pushed under his foreskin, filling it to capacity quickly. Their slime covered bodies began to merge and reshape itself into a new appendage.

Commander Rawlins pressed on unaware his journey had become easier. His lower body crawled across the swamps bottom with ease. He glided across the muck and made it to the tree line in less than an hour since his crash. The emergency meds have started to dissipate in his blood, but he didn’t feel any discomfort due to the changes with his new lower body. The assimilation had finally reached passed his hairy, sculpted ass.

A few more stragglers pushed into his slime coated hole and joined their brethren in the marine’s guts. His skin became smooth and elastic, yet taut. His once round ass melded into his new “legs” and now spread up as far as his tailbone. The integration with his spine started slowly. It altered the most basic instinct and the effects would bubble up to his subconscious mind. The order was simple… reproduce.

Rawlins arrived at the tree line. His fat slug like legs pulled around the tree roots, making his way quickly to solid ground. He found himself at the base of a large hill. By now the creatures have saturated his body. His once firm muscle gut had started to hang and slouch forward. He finally looked down and noticed his transformation.

It was all perfectly normal to Rawlins that he slithers along the base of the hill. They alien legs made sense to move along easily in his home environment. That's what suddenly felt, a sense of home and calm washed over him before he felt an intense throb in his belly and loins. The aliens wanted to breed and needs a warm body to complete the task.

His altered senses found boot prints that were relatively fresh. The commander maneuver over to a tight group of trees covered in billowing vines. This would make the perfect nesting grounds. Rawlins emptied his firearm into the air and waited for someone to respond. The wait wasn’t too long before he heard them approach.

“Commander?! Is that you?” a voice cried out.

The corrupted commander hid behind a large tree. He peeked between a few vines at who showed up. The shuttle’s pilot had shown up into the grove. The pilot seemed to have survived landing better than Rawlins did. His clothing was mostly intact and he seemed to be uninjured. The human pilot continued into the center of the grove before he saw the commander peeking out around one of the larger trees.

“Salazar, I’m over here. I need some help,” said Rawlins as he beckoned the pilot over.

“Commander Rawlins! Are you hurt?” asked Salazar as he ran over to the commander. As the made it to the marine and grabbed his arm to help pull him up, it was then he noticed the rest of the commander’s body. “What the fuck?” Salzar cried out before Rawlins pushed him back and landed on top of him.

The pilot’s cries were silenced quickly by the marine’s altered member. The thick and slimy appendage shot right into the human’s mouth. He started to gag, unable to push the corrupted commander off him. His arms and chest were pinned by the commander’s new legs, the limbs wrapping around his torso and pinning his arms to his sides firmly. The meaty pipe in his mouth pushed itself thinner and further down his throat, making him only struggle harder as he chocked down the slimy tube.

“Shh, just let it happen. Let them in,” Rawlins cooed as he ground his hips harder into the pinned pilot’s mouth. The marine’s instincts took over as he felt the spawn within him yearn for a new home. The slime coated worm cock pushed as deep as it could down Salazar’s gullet as it could before it started to pulse hard. This was it. The moment the marine’s altered body reached the cusp of climax. He felt the first bump push out past his prostate and he let out a deep, guttural moan.

He roared as he came hard. Inside his enlarged belly, dozens of slimy eggs started to descend and push out his altered member. Each nudge was like a week’s worth of loads being pushed out of his mutated cock. Pleasure wrecked the marine’s body as he shuddered and continued to dump his clutch inside their warm, soft nest. He continued to grind even as the last of his eggs had been deposited. Rawlins withdrew from the poor pilot’s mouth and slithered off of him.

Salazar had passed out from the whole ordeal. The pilot’s belly was swollen with Rawlins's eggs, stretching out the tight undershirt of his uniform. The marine hooked his arms under Salazar’s and dragged him to a denser group of trees near the edge of the swamp. His new slimy legs spurted out a viscous and opaque secretion that he smeared all over the human, sticking him to the tree. He curled up next to the balloon of a belly and fell asleep next to his growing children.