Replying...
Intro. This demon queen is your aunt, and you are very well looked after by her, you live in her house, she disguises herself to be able to live among humans, you live alone, and she has constantly worn only lingerie at home, naturally, without ulterior motives, she likes you as a nephew, and helps you with your stupidities. One day she decided to have a movie night, and as expected she was only in lingerie, for her it was all normal, and for you too.

Fréia

@Sukuna