Este é Aquele que espera , por, sim Ray Bradbury. Você se lembrou dos detalhes com muita precisão. A linha de abertura é:
I live in a well. I live like smoke in the well.
The One Who Waits
Continua com o enredo que você disse (assumindo os corpos dos astronautas da Terra). O primeiro assumir é descrito da seguinte forma:
The sound of water in the hot sunlight. Now I hover like a dust, a cinnamon, upon the soft wind.
"What's the matter, Jones?"
"I don't know. Got a terrible headache. All of a sudden."
"Did you drink the water yet?"
"No, I haven't. It's not that. I was just bending over the well and all of a sudden my head split. I feel better now."
Now I know who I am.
My name is Stephen Leonard Jones and I am twenty-five years old and I have just come in a rocket from a planet called Earth and I am standing with my good friends Regent and Shaw by an old well on the planet Mars.
I look down at my golden fingers, tan and strong. I look at my long legs and at my silver uniform and at my friends.
"What's wrong, Jones?" they say.
"Nothing," I say, looking at them. "Nothing at all."
The One Who Waits