I'm looking for two stories and I have no idea where I read them.

The first is a Scooby-doo story, they go to some kind of lumber or wood processing place to solve some mystery. Once they get there the girls are knocked unconscious and wake up alone. They get raped and snuffed by faceless people and in the end of the story you find out that it was Shaggy, Fred, and Scooby that did it. I think that Velma is sawn in half.

The other one is about a one eyed one horned flying purple people eater that actually exists and likes to eat females. It is eating some girls and one of them convinces it to spare her and she starts to help it get other girls to eat or something like that.