Blue x Red - Toying Around (Four Swords Modern Horror AU)

'"Wha- Shit!" he exclaimed suddenly, his feet bumping into something large and almost making him fall flat on his face. He was surprised that he hadn't accidentally run into something earlier with the minimal amount of light that he had. However, the object he'd stumbled across immediately caught his attention. His impact with it caused the white sheet laying on top of it to slide off, revealing a large and incredibly old chest. It had strips of iron lining the edges and was locked tightly, and what looked like small specs of white had poured out from the inner rim and onto the floor. "The hell...?" Blue asked himself, reaching a hand down to inspect it. It felt grainy and it stuck to his fingers like sand. "Salt?"'

When Blue's roommate, Green, has to leave for a month, he is burdened with the task of looking after Green's grandma's old mansion while she is sick in hospital. The problem?
Dolls.