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?