I may be interested in joining this assuming it's still accepting. I have a vague idea to either use Lucifer in a possession contract, or [url=https://www.vice.com/en/article/9bnjya/magickal-stories---brian-butler-conjures-the-demon-bartzabel]Bartzabel[/url] (a planetary spirit/demon and also the spirit of Mars). The latter could be a summon if you don't already have enough of those. As for character concepts, I'll need to mull that over a bit more. I'm trying to think of things that would interest either of those entities, let alone draw them to a human being of all things.