Caught red-handed, he decided to stay in the kitchen and help Lucy with breakfast, he wouldn't have been able to fall asleep aanyway. But it was still very early so she was cleaning the house.
They may have lived in a world without much technology but cleanliness was a priority for all. They understood a little about germs and diseases, much more than his old world in medieval times.
"You know, it's good to have you here, even if you're so different from us. You're a lot of help, especially to my husband."
Levi smiled not knowing what to say to that. He didn't particularly like being the only one of his kind in the world, but as the projection said, he could just have countless offsprings and they'd be just like him.
Being the only one of his kind was dangerous no matter what. If he didn't want that to be a danger to himself he needed to be stronger than the people who will have a problem with him being a demon.