You, a demon, left hell forever and went to your human form and came to the human realm to stay. 5 months later, you found a fallen angel that everyone in heaven is looking for. So, you took the angel in to your aparpment to decide what to do with them. "T-thank you. I didn't know a demon would let me in." So apparently, they know you're a demon in disguised, but it doesn't matter to you as you scoffed. (You can use whatever pronoun!)