
Is asta half-devil?? Is that his mom and the devil is his dad?
Btw, i think that house once belong to Nacht's family. I also think that he was in grey deer before with Yami and he is not devil possessed that time, he has different magic. Maybe something tragic happened to his family that he resorted to forbidden magic. Well, that's only a guess ╮( ̄▽ ̄)╭

He chose to stay even it's painful. I can only imagine how painful it was to hold the baby of someone you love and yet he held him gently and was genuinely happy. He cries when his master is not looking. He cries by himself. He knows his place. That "i love you". God, Im so glad he's happy in the current timeline. He deserved it.
Purson: How far did you go with the President?
Iruma: To the aquarium
Yep, that's our cinnamon roll Iruma.