Mage's Secret

A mage with a rough life experience pursues fame and knowledge. In order to break through the bottleneck of research, he violated the secular morality and signed a contract with the devil. From then on, he had to bear heavy shackles.But...how could this demon be so annoying!While cleaning up all kinds of mess, the mage thought melancholy, this is simply taking care of children.Master: It’s so annoying, when will this kind of day end?Demon: Don't think too much about it, just keep this secret for the rest of your life.Annoying secondary demon attack X gentle and calm mage subject; full 1V1, perfect HE, basically no abuse; [objective age] above; [racial average age] below; [Note 1] thunder/cute points: There is a plot of having children (no specific description, the space is very small); content tags: fantasy, magic, near water, and Western Romans have a special liking┃ Search keywords: protagonists: Trafael Sterling, Murphy Norber┃ Supporting roles: Ai Elvis Green, The Apprentices