I Became the Villain's Contract Family

I Became the Villain's Contract Family summary: Aria offered a contract marriage.To Grand Duke Valentine who was said to have sold his soul to the devil.So she could protect herself and him.[Marry me.]Aria passed him a note that asks for his hand in marriage with her little maple leaf like hands.[It's a contract marriage so we'll divorce 10 years later...]The young master grabbed the note Aria was writing and ripped it to shreds."So where do I stamp it?""You told me you'll divorce me once we're older."The young devil grew up and kissed her forehead."Since we have become adults, we have to instead make a contract for adults."