Meliodas betrayed the demon clan and took his sister with him. He did not want her to grow up with the ten commandments and become his enemy. Meliodas made sure not to let his sister out of his sight in fear that on day she would go searching for Zeldris and Estarossa. He kept her hidden from the world until the day finally came and the ten commandments were resurrected. What will Meliodas do now? Will he tell her the truth or will she have to find it our herself?

This is a soulmate AU inspired by tumblr user fandangoing TodoBakuDeku Soulmarks Au Fluff, Angst, and maybe a little smut if y'all want it. (Fast Updates) (reasonably short chapters) (600-1000 words per chapter)