I've been wanting to do an rp revolving around the two for awhile, and a friend and I have come up with a couple of plots.

one:
A small group of devils and angels meet, and they're the types that are normally tasked with killing each other, but through events they become friends or at least able to stand each other, but in the end they still need to kill each other and over the course of the story there's mounting pressure on both sides to do so.

two:
The demons and angels have a war on earth,the angels lose,the demon enslave the human race,than the angels come back and save them, or something like that.

The ideas aren't very fleshed out yet obviously. Anyone have any suggestions/ideas/etc?