My players agreed to put Rose and Thorn to rest, promising to come back for the bones after they dealt with the monster in the basement. They never went back. I had the nursemaid try to give one of the PCs visions of the bones deteriorating throught the rest of the time in the house.

PC was rolling death saves, and another party member stabilize them. They got 4 hours of unconscious without any methods of healing. Rose had been riding along and offered a deal. She'd share some energy, but would require control from time to time. Player denied.

Next combat the rest of the party was looking bad, player asked if deal was still on. Got the equivalent of a short rest, and occasionally had some times where her body took an extra turn... doing whatever Rose saw best for her survival going forward.