Hooked on a Phoenix

AITA for hooking up with my best friend''s little sister when we were locked in a bank vault together?

I''m a firefighter by trade—though my side hustle is being a phoenix. As you can imagine, not every woman is on board with hooking up with a shapeshifter. Luckily, I have my brothers and my best friend for company. Unfortunately, the aforementioned best friend has tasked me with keeping an eye on...