It's a mystery

Velma woke up one morning much curvier than she was when she went to sleep. She decided to investigate on her own as she did not want the rest of the crew to see her new body. As she tracked down some clues to an abandon house in the woods, she was attacked by a white furry monster who bound and gagged her

Later she was taken to the basement where she saw Daphne whose hair was thicker, wavier, and down to her ass, which was really huge as were her lips, and she was being fucked up the ass by Fred and face-fucked by Shaggy. She could see Fred and Shaggy were not in control of their bodies by the looks on their faces and they had huge, supernatural cocks. Their wrists were bound behind their backs, and Daphne was bound to a coffee table.

Velma had her wrists tied to chains hanging from the ceiling and her legs were spread and her ankles were tied to metal rings in the floor. She had no idea what was in store for her as she watched Daphne get roughly spit-roasted.