Opposites Attract- Pernico/Percico

"Actually, Nico. I'm an angel. You're a devil."
"I was wrong. This is better than Romeo and Juliet. Archangel-to-be and son of the Devil. Polar opposites, but everyone knows opposites attract. Your mommy doesn't approve of me. My daddy doesn't approve of you. So we run away together, and no one dies."
Percy is about to take over as Archangel- the leader of the angels. Nico is the son of the Devil.
Polar opposites, but everyone knows opposite attract.

TW: mentions SA, but not by name. Contains kissing, but not anything further than that. This is a fictional universe that I made up. This does not allude to any religion whatsoever.
Disclaimer: All the characters belong to Rick Riordan.