Having told your idea, the Genie claps her hands, and you're surrounded by a dense pink fog that dissipates slowly, once it fades away, you're right in front of the two suns you described earlier.
Then you feel a deep rumble from within yourself, and an incredibly powerful surge of energy. After the blink of an eye, you slowly start expanding, your gut extending forwards, your arms and legs fattening, your head slowly sinking into your torso.
You start growing til you reach 10 feet, and slowly and forcefully grow in all directions, 50 feet, 300 feet, miles, hundreds of miles, you're not only expanding, but your body is also generating tons and tons of mass until you truly become a celestial body.
As your body grows and expands to it's impossible size, your skin slowly starts to harden, becoming denser, deep within your body you feel heat, a large amount of the energy concentrating in what you think is your heart. Muscle tissue slowly being replaced, on a cellular and atomic level, into sediment, your blood and veins start boiling until they become hot, bright magma.
Your internal organs shuffle around as you expand, becoming a thick ooze of metal and rock, swiveling around your interior and forming the basic components of a rocky planet. Your heart, instead, becomes spherical, it's materials and composition becoming fully metallic, the magma blood boils the metallic sphere to extremely hot temperatures; it's turned into your own core, and while your body expands, so does it, becoming several times the size of the Earth, your own home. Your consciousness slowly drifts towards this new organ.
After what feels like an eternity, you start to slowly lose the uncomfortable bloated feeling of your body, which slowly settles around the size you desired; you're a floating rocky ball with a diameter of 120,000km. You're enormous. You've surpassed the Earth by a long margin and it sickens you that you come from such a weak, insignificant pebble.
Despite this, you still retain your external features, you can feel what's left of your hands, feet and head literally at the other side of the world from each other. This soon changes, as you start violently shaking; volcanoes erupt, earthquakes strike from within your body, forming canyons, craters, trenches, etc. your face and limbs soon become enormous canyons, mountain ranges and geographical features that resemble human body parts, easily observable from space.
After a while, puffs of pink smoke appear all around your orbit; from within, meteors, balls of gas and asteroids are materialized and shot quickly towards your body, hitting places all over. Rather than hurt, this tickles, these are full with water, and soon, you have rains all over you that fill your canyons and gorges, forming enormous oceans, separating enormous landmasses that could fit whole planets in them.
You're now an enormous, rocky planet with oceans and a faint atmosphere, but you're lacking something quite important; life.
After thinking about this, you feel something really strange from somewhere in your body: arousal.
Somewhere in the equator, you can feel something building up, using your enhanced senses, you check all over your surface to see the source of this sensation. This takes some time, but you soon discover your error; you've "zoomed in" your vision too much.
Looking at yourself from the orbit with your psychic abilities you catch a glimpse of it.
In the equator line, right at the middle, you see an enormous, shaking, glowing rocky phallus, and you soon realize that it's attached to giant planet sized testicles right underneath. Within, something is brewing, the genie is working her magic, stroking your gargantuan feature with her magic. The cock is easily one of the biggest geographical features in the known universe, easily visible from space, protruding like an enormous dick shaped volcano, your penis puts the Olympus Mons to shame.
Both the phallus and the testicle looking features start glowing intensely with a huge flow of your magma-blood, and after what could've easily been eons, you're suddenly hit by an orgasm of, literally, astronomical dimensions, all your body shakes as cataclysms occur, and an ocean worth of your cum is expelled out of the giant gland-like features and your giant urethra caldera. With your newfound knowledge, you soon realize that your cum is the only physical aspect of you that hasn't changed, it's still human, but has been produced in enormous quantities by your new planetary sized organs.
The semen soon cascades back into orbit, falling like meteorites into your many oceans. The enhanced sperm cells then break down, their protein and your old human DNA reassembling into simple life and bacteria, soon algae starts to grow all over your oceans, and then complex multicellular organisms; oddly earthly looking jellyfish, sponges and starfish develop, soon followed by fish, arthropods, etc. These changes occur through millions of years, but time is exaggeratedly speed up by the transformation magic.
Recovering from your orgasm, you regain consciousness and examine yourself. There's grass and trees in every single one of your continents, from which terrestrial life is developing immediately. Everywhere there's alien, and also earthly looking biomes, colorful, lively corals full of aquatic life, forests with enormous trees the size of skyscrapers, canyons so deep they make the Mariana trench look like a bump, glaciars that rise ten times higher than the Everest, floating islands full of trees and mountains that defy gravity, scorching deserts dotted with hundreds of beautiful oases, rivers full of life that cross your continents like the Amazon, even your "genitals" have grown enormous rainforests and waterfalls, although their trees and flora are quite different: not only they're huge, bigger than anything back in Earth, but there's also certain flowers that glow intensely like neon lights that possess tendrils and roots that might be direct connections to your own consciousness.
About fauna, there's no spot in you that's devoid of life, not even the chilling poles. You've got your regular earthly animals, but your own version, they're several times their normal size, and possess mutations to survive your ecosystems that make them look slightly alien; you manage to see ants the size of cows, butterflies that are around 100ft wide, frogs the size of buses, etc.
You also discover that your own dinosaurs have never gone extinct, of course, no meteor has ever fallen on you, and no one could ever manage such a thing, your atmosphere and ozone layer are hundreds of times more powerful than Earth's. These dinosaurs are absolute monsters, enormous, bulky and something out of an action movie, your sauropods are the size of mountains, and your theropods as long as an aircraft carrier.
In your canyons and ravines, enormous wyvern-like creatures live, each one around the size of a warship. Dragons! Your sperm somehow managed to evolve into actual dragons! And not only dragons, you actually notice creatures that resemble hydras nesting in the jungle caves.
In the ocean, giant leviathans reign as the apex predators, each one measuring around 700ft long, which is kind of proportional to the size of a sperm whale considering how deep and enormous your oceans are.
All creatures are immensely powerful, adapting with no problems to the conditions of your body, each one a direct descendant of you.
You feel proud. You've created life. These are, in fact, your children.
Outside of your now lively and oxygen-filled atmosphere however, some of your sperm is still drifting away, but the globs are so massive that they develop their own gravity field. Soon, space dust, rocks and other elements are dragged by your waste, and soon develop into your own moons. Once an impressive amount of 600 moons, some drifted away and gathered together to become other planets in your solar system, and some were absorbed to become even bigger moons. Now you have around 80 satellites around you, each one around the size of Mars, with 10 of them containing sperm cells that managed to survive and develop life in their planetoids.
You now feel the energy subdue. You feel at complete peace, every side of you brimming with life, your moons tickle your magnetic field, and your cock soon calms down, becoming an inactive hyper volcano. You're a planet. You're life.