Depends on the setting.Uh huh. Succubus is a demon, but that don't neccessarily make her an kill-driven cold-blooded machine. Co-existence is surely can be.
In Warlock Saga you can bound one to your service, but it's still the Succubus Covenant universe, so she'll kill you if you give in to her temptations.
Zion made this series as an answer to the harmless succubi in other media, so they're *dangerous*. Parasites of life that must feed on others to survive, and enjoy it so much they don't find a reason to hold back. They are lust and gluttony.
There *is* a clan of succubi in the game that tries to rise above that aspect of their nature, but we don't come across them (yet) because we are dealing with a demon invasion, so the succubi we meet (mostly) want to devour men.