John Constantine is far from the first person to try to worm his way out of consequences by selling his soul to multiple entities. Too bad he doesn't figure that out until he sells his soul to a random teenager.
The original author can be found here - https://archiveofourown.org/users/myheadinthecoudsnotcomingdown/pseuds/Clouds
You can read along here - https://archiveofourown.org/works/44192707/chapters/111129085