I'm still reading this but I feel like I needed to write a review as I go.

First, the cover reminds me of an old lady. It's so boring.

This books seems all over the place honestly and I really hate being confused. Its one thing to make it a bit of a mystery and another to just leave the reader hanging and not know what is going on.
Why is envy in this game?
Why is he loosing his power?
Why in Camilla so special?
WHY IS IT TAKING SO, GOD FORSAKEN LONG, TO GET TO THE POINT?!
Honestly, I'm trudging through this book.
Camilla is so freaking annoying. I really can't stand her.
Envy is suppose to be a demon lord! Prince of hell! Prince of sin! Why is he letting her get away with everything? How utterly boring.
"You cannot talk to me like that!" Uh... yeah... he can? He's a demon lord. He can do as he pleases? He's just being so nice.
Honestly, I like the banter between brothers more than I like Camilla and him together.
There is no other emotion in this beside lust. I have no feeling of love or endearment.
Gluttony is right, just feels as though once he's bored, he'll cast her aside. And honestly, I think id prefer him to throw her back to the humans and let her play with them after this game is done because I really can't stand her.
Obviously she's gonna have to be something "special" but at this point I don't care. I'm half way through and nothing has happened!

I will say, if gluttony has a book, I'd like to read that cause I like him but this book is not my favorite.