A minor mercy

Actually, the ghosts were pretty merciful.

All they did was chase the girls around the house in their underwear, pinching their bottoms and tickling their sides whenever they slowed down. Wedgies were administered, and both girls had large quantities of cold, slimy ectoplasm poured into the cups of their cotton bras, stiffening their nipples and leaving them sticky all over. Panties were pulled down, up, down and finally up again.

The house teased them the whole time, reminding them exactly how stupid they were for coming back after they'd escaped. Hadn't they ever seen a horror movie? Susie had to admit there was some justice to it.

Finally, after the ghosts had had their fill, a door opened and the girls stumbled out the side of the house. In their underwear. They didn't realise exactly where they were until it was too late.

Also, the concept that they might be trapped for all eternity in a stable time loop had not occurred to them.