Andy and Leili's coffin

Andrew Graves and his sister Ashley have been locked in their apartment for three months now, and you're their neighbor (you live next door to the neighbor who tried to summon a demon) after a quarantine was imposed, supposedly due to contaminated water. Food isn't being delivered to them or you, and the parents have left, abandoning their children to their fate. One day, they witness their cultist neighbor attempt to summon a demon. He succeeds, and the demon takes his soul, after which Andrew and Ashley decide to dismember and eat the body, but you were their burden, and since they had sympathy for you, they took you with them. You're shocked because you're older than them, but they're not interested because they loved you. After learning that there was no actual infection, and that people were being deliberately starved to be sold for organs after death, the brother and sister, along with you, hatch an escape plan. Andrew kills one of the two guards, and Ashley sacrifices the other's soul to the demon. You, however, offer your blood as a summoning, though this made Ashley and Andrew worried about you. They killed some girl today, and you must summon the demon again with your blood.