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The day Hyacinthus died, the world experienced only dusk as the sun dimmed with Apollo's heartbreak (not complete darkness as the Sun Gods from other pantheons managed to take some control from Apollo.)
Instruments could not find a tune, poets could not find the words and sicknesses instantly began to run rampant.
This lasted for three days.
It only lasted for three days as Artemis, who could not bare to see her twin in such pain, Aphrodite who was so weak for love and Athena who saw no wisdom in allowing the mortals to experience such turmoil decided to resurrect the fallen Spartan prince.
The resurrection was simple enough, as Hyacinthus' soul had not reached Hades given that he was turned into a flower. The not simple thing was having to petition Zeus to turn the prince into a God.
Surprisingly, when Artemis, Aphrodite, Athena and Hyacinthus came to Zeus' throne room, Zeus himself was in a good mood for once and turned Hyacinthus into a God with nary an argument.
The conversation being:
"My King," said Artemis, Aphrodite, Athena and Hyacinthus.
"Yes," said Zeus sitting high and mighty in his throne.
"We ask that you turn the demigod mortal Prince Hyacinthus into a God." Said Artemis.
"Why should I?" Asked Zeus.
"So my twin stops crying." Said Artemis.
"For true love." Said Aphrodite.
"So the mortals, necessary for our existence, stop dying." Said Athena.
"Sound arguments." Said Zeus. "Now to you, Prince Hyacinthus, do you wish to be a God and join us in Olympus?"
"I do, my Lord." Said Hyacinthus.
"So be it." Said Zeus and turned Hyacinthus into a God, the God of Decay and Renewal to be specific.
Apollo, finding out that his dead mortal lover had come back and ascended to Godhood experienced such joy that the sun shone bright with peaceful warmth, musicians performed beautifully, poets wrote the best poems of their careers and all those experiencing illnesses were miraculously cured.
Together Apollo and Hyacinthus lived happily ever after.
Over 3000 years later:
"So the cabins each represent a god, right?" Asked Percy as he sat with Annabeth on the pier.
"That's right, there's one for each Olympian God." Annabeth replied.
"So, for example, the Golden cabin represents Apollo and then all his kids are in it?"
Annabeth bit her lip, "Apollo is a bit of a different one," she said, "it's not just his children in his cabin, but it's not like Hermes where all the children of the Gods are welcome inside."
"What other kids would Apollo have then?" Percy asked with confusion.
"His husband's children, the God Hyacinthus." She replied and pursed her lips, "but.." she drew out.
"But what?"
She sighed, "I don't know how ready you are to hear this."
"I found out my best friend has goat legs and I saw my mother get squeezed to death by the Minotaur on the same night, I'll be fine."
"Listen, you understand that the Gods are very different from us mortals right, that they don't have DNA like us."
"I didn't, but now yes."
"Well, it's the same with how they make us children, sometimes we spring from the thoughts of our mother," Annabeth shifted uncomfortably, "sometimes they have children with mortals of the same gender. And don't ask me how," she said quickly when she saw Percy's mouth open that then quickly closed at her words.
"And other times," she said after a moment, "more than one god has a child with the same mortal."
"A human has two different children with two different gods? That's not that weird."
"No," she grunted with frustration, "that's not what I meant. Sometimes the children have three parents, two Gods and one mortal."
"So you mean that-?"
"Yes Percy, some of the kids in Apollo's cabin are the children of both Apollo and Hyacinthus and a mortal."
Percy's brain was actually struggling to compute this information along with everything else he's learnt, not that he'll admit it to Annabeth.
"Huh." He said, it was the only thing he could say.
Annabeth nodded, "that's right," she said, "huh."