1) Your OC and Loona become friends when they meet each other at Queen Bee's party.
2) Loona calls your OC drunk one night needing a ride home while Blitzo is staying the night with Stolas.
3) Your OC is a human that meets Loona in human form and is immediately enamored with her but has no idea that she is a hellhound.
4) Your Own Idea (must be explained and approved)