Yes. If demon must create physical body to be in world, by impregnate virgin personally, and have no physical body to impregnate virgin to begin with how get body in first place? Either must get body from virgin imprgnate by someone else or can impregnate virgin when have no body.
Book under light house say: "The Church of Cambion attacked us last night. We were accused of harboring their escaped virgin sacrifice. The demonic spawn requires the body of a virgin, mane as dark as night, and a descendant of demons long forgotten. There is no everlasting life for them. Their minds are rotten. A devil they will bring into this world."
Important thing is: "The demonic spawn requires the body of a virgin, mane as dark as night, and a descendant of demons long forgotten. " To get body Daemalius need brunette virgin who is descendent of demons, not say must be one who impregnate girl himself. Maybe get right girl father of Daemalius can just be man. Maybe MC. As long as girl is virgin with black hair and have demon blood. Or maybe Daemalius can possess MC and use his body to father body for self. Don't know. Interested though and hope to see. Not think Madalyn want help brother go heaven.