Percy knew Nico Di Angelo wasn't the only Hades kid. But, he did not expect that there was a Hades and Persephone child living in Olympus with Demeter.
He also didn't expect to meet them after the quest of retrieving Annabeth.
After Percy, Annabeth, Thalia, and Grover arrived on Olypmus, all the gods were in their respective thrones. Zeus, Poseidon, Hades, Dionysus, Demeter, Hera, Ares, Aphrodite, and Artemis.
You were standing beside Hades, and it was obvious that you were a Hades child. The dangerous aura, the sneaky look in your eyes, the black clothing style, and so much more.
After the actual meeting was over, there was a party. Olypmus parties were nothing to skip out on. They were hella fun. Who knew partying with a bunch of gods was so much fun?
You were with Hades, and, surprisingly, Persephone. She rarely visited Olypmus. Yet here she was.
Percy kept stealing glances at you. He really did think you were beautiful. And, besides, Annabeth was off flirting with some other boy, Grover was talking with Demeter, and Thalia was long gone talking with Zeus.
So, he waited for the right time to attempt and approach you.
You looked so pretty. It was messing with him more then he'd like to admit.