A Japanese office lady in a lab coat with glasses and a ponytail is browsing Internet satellite images of the local mountains. She is working in a large, luxurious beauty salon. In her dark office her glasses reflect the computer screen. There is a file on her desk labeled 'Mud Bath Prospect Specimens'. She finds what appears to be a promising lake of mud, goes to the parking garage, gets in a company van and drives towards Mt. Fuji.
As she gets closer to the GPS coordinates she hears less bird chirping and there are less plants. "Odd," but she continues on her route.
She arrives at the mud lake. It's huge and dark grey with no grass or trees growing near it. A heavy fog blocks the opposite shore from view. She backs up the van and opens the doors, revealing the entire cargo area covered in neat rows of buckets. She uses them to scoop up enough mud for a whole hot tub. The consistency is much different than other samples she's collected. It's very runny. She hopes this means it will be a special batch.
Back at the salon she empties the buckets into an expensive-looking bath tub sunken into the floor. Once it's full she locks the room and strips down to a white bikini while the tub heats up. She undoes her ponytail and puts her glasses aside. Approaching the mud, she slowly dips her right foot in. It's very smooth and thin. She steps in with ease and drops down into a lounging position. It's a lot more comfortable than normal mud. It's lighter making it easier to breathe.
The silence is broken however when the mud starts to move on its own! It sloshes violently, churning and bubbling. She panics. It thickens and clings to her body. She yelps and gasps. "Ah! Ah!" It starts to tickle and it's temperature rises. She can feel it press against her like it's feeling her. The alien goo interfaces it's DNA with her own, created a tingling sensation throughout her skin. It links with her female X-chromosomes and other genetic information it needs to repair its own genetic structure. The sensation builds up.
It forces itself against her groin more and more. Mud passed between the fibers of her bikini bottom and into her vagina. "Aaah!" She arches her spine backwards and winces in ecstasy. No matter how much she tried to close her legs, the mud was still flowing along her inner thighs and into her holes at a steady rate. It was even tickling her insides. It wouldn't stop filling her up. It pulled her legs apart and the flow became overwhelming. "Ahh!!" Tears of insane pleasure and fear ran down her face.
Something was forming on the surface in front of her. A giant bumpy slit solidified. It opened, revealing a giant red eye with a yellow iris. It stared at her menacingly. She screamed and turned around, trying to to crawl out of the tub. Webs of mud stuck to her arms and legs. Thick mud strands were still reaching inside of her from the tub. The weight of the mud in her body made it hard to move. She couldn't stand up.
She could feel it snaking up her throat. I was going to emerge from her mouth. She tried to keep it down with her throat muscles, but it was stronger than her. "Mmph!" A tentacle made of mud popped out between her lips. It stopped there, twirling and flailing. She couldn't stop looking at it in horror.
The animate liquid filled her breasts from the inside. Her nipples leaked dark liquid which soaked into her polyester bikini top. It spread unnaturally fast and seemed to be targeting it. It transformed her bikini into a different material.
