It's about a boy that lures another boy to a house and ties him down,an older man appears and together they kill him with a knife, after that they BOTH rape his body, later the man takes the body to butcher him and cook him for the boy, after that the boy goes outside to lure another victim.

I remember the boy being very enthusiastic about killing the other boy (with a knife if i recall correctly) it was drawn (no 3d) and the boys were like 11-12 years old. It was SO good and i don't remember where did i read it.