Demon is a type of race where you're blood is of the magical race and you have some demonic heritage. They're similar to the fairy folk except they usually have strong physical strengths... where most fairies are prone to be known more for their magical strengths. However, that is just a generalization and there are always exceptions to those outlines.

I-I agree... [So much blushing] but Miss Reisen was also very kind too and knowledgeable too. Her company was enjoyable.