Scifi starship, garbage hauler for super toxic waste
Small crew of like 3, huge ship
Carrying inert nanite dust, contraband bdsm gear, and 34 tons of memory storage discard from Furaffinity.Galactic's latest upgrade
Cargo system failure leads to containment failure
Crew manages to clean it up but misses a memory storage, some spilled nanite dust, and a box of BDSM gear
Nanite dust stops being inert, reads memory storage, absorbs bdsm gear

Crewguy goes off shift and heads to quarters
Trips a "practical joke" bucket of goop onto him, maybe 2 cups worth, blames other crewmember for hazing
Goes to showers to wash off, it's not coming off
It seems to be absorbing the water and spreading
Skin tingles weirdly as it spreads
Hands are covered and fingers start to stick together and become immobile
Tries to scrape it off out of the water but then it stiffens on his arms, immobilizing them 
Arm forced to move out to water again, the goop continues its spread
Quickly covers entire body except face
Tries to probe into mouth, holds it in tightly
Probes and fills into ass forming a buttplug, gasps, enters mouth, covers eyes which form some sort of goggles that allows him to see
Cock is stimulated to full length, then the goop hardens around it and forms a thick ball over it
The goop relaxes, allowing the guy a brief moment to panic and claw at himself, but it's a thick latex coating
Looks at self in mirror, goop has formed his head something animalistic, looks back and sees a thin limp tail
The goop stiffens again, then despite resistance walks him over to the shower, standing him under it
The latex absorbs the water, then tightens around his middle like a tight girdle, compressing him
The goop now fully controls his movments
Runs dainty-looking latex paws over hips and butt as they swell
Caresses the tail as it expands, filling up and stretching 
Guy mentally shouts to himself as it rubs its chest, he's able to feel the growing weight of breasts, swelling as they absorb  the water from the shower
The mount over his cock stiffens and swells, then balloons out
Is not solid latex, but is filled with liquid
Four teat-like nozzles form on it, confirming its an udder, swells to basketball sized
The goop reaches out and turns off the shower, then relaxes and lets the guy move around
He tries a few steps, offbalance from all the sloshing
Makes it to bed, falls back onto it, tries to stay still as water slowly stops moving around
Explores and looks at his encased form through the goggles, pokes his mouth and finds the goo has coated his mouth and probably most of his mouth
Reaches back to rub his ass, finds a latex hole for his butthole
Looks under the udder for his cock, finds a similar latex slit
The latex layer gently stimulates the guy at a low level to ease discomfort, which only works a bit.
"What the fuck just happened."