John Constantine was the biggest headache Danny had managed to get, ever. After becoming King he did not think that his first task would be to solve the man's soul problems.
And it seemed quite incredible to him that the hellbazer would consider selling his soul as if it were a used car that he wants to get rid of to buy a new one. He was aware that he needed a soul, wasn't he? That it was not possible to buy a new one? Because he didn't want to be the one to inform him if that was not the case.
To top it off, beings from different domains within his kingdom came explicitly to claim the British's soul, which didn't even make sense, there were thousands of souls! Why did everyone want the same one? And why did he have to be the one to take care of it?
Completely frustrated, he placed all the paperwork for John Constantine in an empty room and locked the door. He smiled as he came up with a plan to improve the situation, it might be worth it.
That's how a drunk John Constantine found himself signing a dubious contract in exchange for the power to turn any liquid into beer, he didn't bother to read the contract, most demons just wanted his soul and this guy looked so human, with a presence so light it must be a minor demon for sure.
This turned out to be a bad decision when the next morning he found himself trapped in a room full of documents, the door locked. Taped to the door was a green note that said "Enjoy doing your own paperwork sir, I hope you're pleased with yourself", and well, maybe he should have read that contract after all.