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I had a very nice fic idea/daydream. Lemme share. Moral of the story is that Sally is a badass and best mom.
Anyways so it's Sally's POV and she finds out that Percy died when Poseidon throws a grief induced tantrum making the weather/oceans explode.
Sally does waste any time, she gives Estelle to Paul and heads down to the underworld via central park entrance.
She pulls out a bone for Ceberus and pets him (because they're already friends, Sally loves playing with Mrs. O'Leary and Ceberus) and has him track down Percy. And when she finds him, she just. Hugs him and then walks him out of the underworld.
Hades eventually notices and shows up to tell her that she could be happy in Elysium with Percy and Paul - all three of them have earned it.
Sally tells him no and that she's determined to bring Percy back. Hades says I can't allow that, but then Persephone says no babe let her. I like her. We bonded during the titan invasion and we've been having weekly book meets.
And while Hades is busy being shocked and trying to figure out what books his wife likes, Persephone waves her hand and a path to the surface appears. Sally walks with Percy through.
Poseidon's pouting at the entrance all, "I was gonna offer him immortality and a place in my palace." And Sally is all Amused like "bitch you took too long. When were you gonna go, after you spent the entire month destroying the surface world?"
Meanwhile Percy is stunned. His mom went to hell for him. His dad still wants him in his life for eternity. Like no wonder he's such a protective badass. It's in his DNA.
Eventually they get home. Poseidon follows them, and he's still pouting so Sally takes pity on him and says you know what. If Percy's okay with it, I'll share custody of our child. You can have him on alternating weekends as long as you don't send him on quests or put him in danger. And that quite literally sends Poseidon over the moon (emotionally). He kisses Percy's forehead the moment Percy says, "yeah I'd like that! I get to see Tyson!" And leaves to redesign Percy's rooms.
Meanwhile, Paul has already changed Estelle and cooked dinner for Sally, Estelle, himself and Percy (he had no doubts that Sally would be successful) and the table is already set, like a good househusband.