My Harem Demonic System

This is a story about a teenage boy seeking for his revenge. After witnessed all of his familly got brutally murdered in front of him, Devon Arias sabotage a Demonic Summoning Ritual and got posessed by seven demons. They make a deal to exact his revenge to everyone who responsible for the death of his familly. The pact is done. Bright transparant screen appeared. [You are now posssessed by demons] [Skinned 10 soldiers alive] [Deflower 3 Royal Bitches] [You received 100DC] [Exchange 200DC with 20 Wrath Points?] [20 Wrath Points give you +2 strength] What will happen to Devon next? Will he be able to control the seven demons or will he controlled by them? What about Devon's revenge if those demons secretly have a secret plan to rule the world?