You pick the sarcophagus closer to you, figuring it'll be easier to get a quick touch to sate your curiosity. You put your hand to it, and freeze- you try to pull yourself away, but somehow it seems to be drawing you in further still. A woman's voice says something to you in an ancient language, but somehow you understand it perfectly: "Egypt must have a pharaoh, and it shalt be you."
Everything goes white, and once your eyes focus again you find yourself naked in a white void. "You shall be remade by the divine seed of my husband, the pharaoh, and birthed from my womb," the voice tells you. You see a couple in ancient Egypt lie together and have sex, the man pounding his hips into his lover's pussy until he cums inside her. And once he does, you see an egg surrounded by sperm, one of which soon fertilizes it. What's weird is you feel a tingling sensation spread through you, and slowly realize, this baby they just made will be you.
"Do you feel your body being reshaped by our seed?" the voice asks. "Instead of a normal child, you are to be a pharaoh!" You see the large belly of the woman you just saw get fucked, and recognize that your developing form is inside her. Before your eyes, your body adopts to be more like the pharaohs who are to birth you- your skin tone darkens, your hair turns black and your eyes turn a vivid brown.
Something else about you seems different as your foetal self grows inside the pharaoh's wife. "Not only that, but you shall be like me! A pharaoh princess and queen!" A warmth swells inside you and you slowly understand that that's what it is. Your figure slims down and your shoulders narrow while your hips widen, giving you a feminine figure. Your facial features turn more dainty and pretty. Your skin smooths and becomes almost hairless. Your chest swells and you develop breast flesh to feed your young. Your penis shrinks away and your testicles tuck up inside you, a vagina forming in its place to birth a child rather than make one.
You've barely gotten used to your newformed womanhood when you emerge from your new mother's legs as a newborn, and she and the pharaoh confirm your reassigned sex. Time flashes forward 18 years and you find yourself about to be ordained as your father's successor. You're wearing a beautiful white dress, and handmaidens surround you, keenly dressing you with beautiful accessories. One helps place golden shoes with cute heels on your feet and paints your toes a deep red; another attaches bracelets made of gold and studded with jewels to your arms and paints your nails an equally radiant shade of red; and a third attaches brightly glowing earrings of more precious stones to your ears and places a headdress upon you.