During the Season 13 finale - Sam comes up with a wild thought. With Dean saying "Yes" to Michael and Lucifer being handed Death. What could Sam possibly think of to rescue his brother? Easy. The thing Dean hated most. Demonblood and his powers. But that's not enough well unless you mix in an Angel's Grace. - this story is also posted on my Fanfiction and AO3 account under the pen name of Bella4evr3