You carefully remove the screws on the vent opening, then you get in and walk through. You have to do a bit of climbing, but you eventually reach the vent on the ceiling above your parent's bed. Dad isn't there right now, likely sleeping on the cough, but both Mom and Hannah are there, sleeping... naked?
As you peek down at them, you notice that the vent hatch you are standing on is loose, but it's too late. The lid swings open, and you fall with a thud onto the bed.
What happens next?
