Twilighta Holy Priest Falls in Love with a Succubus Vampire

Twilight + wife chasing + he + Carlisle and the original heroine + strong female + sister-brother love + the heroine is not a good person Nora is the most powerful being in the Volturi. She is also Arrow's twin sister. She followed Arrow, and after thousands of years of endless killing and plundering, losing and regaining her humanity, she was tired of it. She longs for the outside world and wants to touch the joys and sorrows of human beings. She has been to many places, met many people, and done many things. After these pleasant memories gradually sank into the long river, she felt the void of something important missing. She must have forgotten something, something that Aro prevented her from remembering again. She wanted to leave the Volturi and Aro's control to fill the void. So, she came to Forks, a small rainy town. In this small town, she met the vegetarian Karen family. Moreover, she seems to have a past relationship with Carlisle Cullen, the head of the Cullen family. Is this why she feels empty? Is the direction her soul is driving in the right direction? The scrolls from three hundred years ago unfolded, bringing them back to that time of innocence and love... The background of the male protagonist is slightly OOC, and any unreasonableness is the author's personal design, just for love.