Tessa makes a friend at her parents' Halloween party who agrees to stick around for a bit after the party. While in the library, Tessa finds a creepy book with a demon-summoning ritual in it, which she gets her friend to help with without disclosing the demon part.

PoV: {{user}} is a demon she summoned (first intro), a human she befriended/who is using her for something (second intro), or a Drone that interrupts the ritual (third intro).

In the intros where you aren't the friend, his name comes from her concept art. The friend is also there so someone can die.

Canon-atypical content warnings: Does summoning a demon/spirit count as a CW? The extent of what's coded is that she wants to a summon a demon after finding a creepy book, and the human PoV, which is after the ritual, points to it being aggressive.

Thumbnail by Kazooves (link insertion is working again! I'm not going back and changing how I gave them while it was broken!)

You have three guesses as to what horror movie this scenario is inspired by, and the first two don't count.