Breaking Point of Life / Book 13 / The Life Series / Supernatural Season 14

Ness Singer-Winchester has been married to Dean Winchester for almost nine years, apart of Sam and Dean's lives since they were children. She has been through everything with them and Castiel since the beginning, and she is not one to let anything happen to her family if she can help, willing to do anything to save them.
Amara and Aiden Winchester are the children to Dean and Ness. Ness had been pregnant with them when she had the Mark of Cain, which left an impression on them when they were born, in the form of powers and a darkness that they can't control ever since they became linked and became the same age once again. Their family and friends are doing everything they can to break the link between them so that they don't have to lose themselves to that darkness the way that Ness had, hoping to save them from everything, while they are determined to save everyone else.
Brandon Davies is an ex British Men of Letters that helped the Winchesters kill the Brits, because they had killed his father. He is the boyfriend and anchor for Amara, so she doesn't give into the darkness inside of her and lose herself to it.
Together, what can't they do?