What is the official term for the situation I'm describing?

I'm looking for a way to describe a guardian's obsession with his ward. I know there's the Oedipus/Electra complexes, where a child is obsessed with their mother and father respectively. But what about when it's reversed? I also know of Stockholm Syndrome, where hostages become infatuated with their kidnappers, but no one's been kidnapped in this scenario. In this situation, it's the man who becomes obsessed/infatuated with the girl he's in charge of raising. They aren't blood related, so it isn't technically incest. Does this situation/complex have an official term like the others, or is just a regular obsession? 10 points for the best answer. Thanks a bunch!