This is an aged up Percy jackson AU
I've seen not many but a couple fics ware Percy jackson as an adult in the DC unaver ends up getting into a relationship with Bruce Wayne/Batman. This kinda makes sense because all the charicters that Percy tends to describe as attractive regardless of gender are badges, that ether like to create things and or are driven. They also atlest at some point show that they care for the people around them or seem like they do.
I've also seen a few ware Percy gets custody of damien somehow, and it's one of the people who raises him. Wich makes sense because Percy is the type to be good with kids, aspeshely kids like Damian Al Ghul-Wayne. Kids that hade to lern how to serve and fight why before enyone should have too.
So what if we put these two together?
Percy somehow got into a relationship with Bruce Wayne not know about each other's hero life.(because that's funny to me and I like the subplot) When one day as the 2 are hanging out Damian joins the family.
Damian probably dusen't like Percy all that much at first. This person stole his mother's rightful spot next to her beloved. They also act weird around him, much like how Richard duse but different.
You see bow the rest of the bat clan are carful with him(he always says sharp things on him) and as much as some of them try to do so... they don't truly treat him like the child he actually is. Now here is Perseus Jackson, a person who not only knows what it is like to have a childhood forcibly taken from you and have it replaced with a sword in your hand, but also known how to try to keep that childhood for as long as possible in those situations. They did tech at camp after all.
You could probably throw Jason in thare as well. Percy would probably know how to deal with a kind stuck in thare own rage and morning. He knows what it is like for people to be scared of what you can do.
I also kinda what to see people go all out on a villain that wanted to hurt one of his kids or loved ones. Maby the Bat kids or Bruce pulls him out of it and it's awkward for a little bit. But they don't abandon him. They all know what it's like to there's just that little bit of control. So that you can protect those you love.