this story begins here:
Ernie and Tim were two men who had recently bought an apartment room, and were preparing to watch a movie.
Ernie was 32, Blonde haired, and wearing a green shirt, light brown pants, and brown shoes.
Tim was 30, he had glasses, black short hair, and he wore a white shirt, and wore grey jeans and red sneakers.
At that very moment in the apartment directly above, a rogue scientist doing tests on radioactive gas knocked over a jar of it, which, without any hesitation, started to fill the apartment directly below with invisible radioactive gas.
Of course, Ernie and Tim were so busy watching their film, they didn't notice the gas entering their apartment. The invisible gas was slowly starting to affect them, and soon, it would cause them to undergo transformations that they never actually thought possible.
an age change could make them change in age; They could regress to babyhood, or live the senior citizen life.
Animal tf could allow them to live as animals.
body modification could modify their bodies, like giving them, muscle, weight, or extra limbs or something like that.
size change meant they'd change size; they would either be stomping around as 50-foot giants. Or, they could shrink to increasingly smaller and smaller sizes. Ernie and Tim always were fascinated with shrinking in films, and always wondered what it'd be like to be extremely tiny; being nearly microscopic size.
they could change into female versions of themselves, via a transgender.
or they could become robots, mechanical robots.
or they could turn into superheroes.
the choice was up to you.