Bella Swan has a twin brother Valentine Swan who just so happens to be mate of Jacob Black.
While unknown danger lurks in the dark, Valentine's unknown powers keeps growing, and apparently a war centuries ago between the beings of the dark may just so happens to answer at least some questions.
Book one is completely done, but if you want to read it in all one huge chapter. There's 17k words you can see that on my page titled book one of Twilight Jacob x male oc
(Things to note; this is a modern remake of Twilight /2022/ and also vampires burn, but don't worry most of them have daylight rings, necklaces or bracelets also imprinting is the equivalent of a mate.)