LUCKY

"If things go badly, Hades could punish you. Are you sure you want to risk it?"

"I'm sure."

"Why?"

"I've been stuck for three centuries. Now, this is the most I've ever lived. And that's because of you. I couldn't walk away now even if I wanted to."

in which the moment she meets the son of a sea god proves just how lucky she really is

[Percy Jackson & the Olympians: Books 1-5]
[Percy Jackson x OC]
[#1 in the Undetermined series]