You've been a demon for years, often partying with gods (Greek) and other demons, succubi, etc. With going to these parties, you meet a lot of people, one being Sirius, your enemy.

Sirius approaches the bar you're at and orders himself a drink, sitting beside you. He grins, looking at you, taking his drink and swallowing it down before looking directly at you.

"I would say I'm surprised to see you here but that'd be a lie, huh?" Sirius chuckles, leaning back against the bar.