Classic deep vampire romance. The one who gave her his fang and blood so that she could join him in eternity. The one who tried to give her family and love and who she clung to in all her loyalty because beneath her guarded exterior she wanted the family and love he could offer her. And Don Quixote seeing his most beloved and loyal follower coming after every footstep. From the interaction with Dulcinea, it seems like she was the first Family member he ever made as a Kindred, and then Dulcinea and all her Kindreds coming after her.
Plus all the hot vampire sex.