Use the dwarven idol.

Quickly, you pull the small object Paulo gave you earlier today and present it to her. You have no idea how to use it, but you're ****, and he did say it wards off demons.

She miraculously hisses and reels back in the presence of the idol. The center gem glows bright and she stumbles back farther and farther until she bumps her rear against the door. Snarling and clenching her teeth, she flees back outside, and you hope that having this means she'll never come back. Thanks, Paulo.

You head to your room, change into your pajamas, and breath a sigh of relief. That was a close call. You can't believe you saw an actual succubus. But now you slip under your covers and drift off to sleep.