Any idea what this fictionpress story is?

So I read this about a year ago? It was actually a story and its sequel, on two different author pages (they were collaborating).

The first story is about an average college student who summons a demon from a book, and he also happens to be one of the princes of hell or something like that? He’s odd, detached, curious, but she falls in love with him. I can’t remember much more. I think the girl meets a fallen angel?

The second, which is like a sequel, and was on the other author’s page, is about a girl who dies as a teenager and becomes an angel. Her wings are green, I believe. And the boy she loves (who was dating her twin sister) becomes an angel a few years later, with one white wing and one black wing. They have a mission to go back to earth and run a diner, which doesn’t sound like it would make sense but it does (trust me). They save a dude from a demon and he becomes their cook. . . the girl finds her sister again, but years passed and she’s a grandmother now, and they meet the demon and the girl from the first series (she’s pregnant) as well as a lot of other comical demon characters.

I loved these stories (very funny!) and thought I’d bookmarked them, but I can’t find them for the life of me. Help?