Cuphead and Mugman; The quest to kill the brothers

The Cupbros are supposed to do the devil's bidding. Supposed to kill people .Anyways,it's their life or the others. Either way, one of them is going to die of the ink illness and the other out misery, So they both choose the latter.
(Warnings;OOC characters,I will add OCs and other people's OCs if they agree or want to play a small role in the story.Oh and based on BABTQFTIM)