We have a bunch of ways to deal with parasites in the tutorials on this forum, some being collected here: Forum Tutorials: Parasite Collection
The most common is to banish and cleanse, and set up wards to stop them from coming back.
Right now it’s able to feed on you, and influence you to produce more of the kinds of energy it likes, and that’s usually unhelpful for you.
With a succubus, the exchange is that they get you to produce sexual energy, which is enjoyable, and they feed on that. So it’s seen as a fair trade, or at least a mutually willing one.