Dulcinea Simulator

This story begins during a robbery in an art gallery, you are a thief who fell in love with the painting known as "The Scarlet Priestess", you don't know how but when trying to steal it, you trip and fall into said painting. When you wake up you realize that you are in the world of said work of art, everything you thought was beautiful turns out to be false, the priestess depicted in the work turns out to be a sacrifice that her people will make for the gods. What will you do? After all, you're only human. (You have a gun and know self-defense).