Arthur and the Tea Shop

I came up with an idea for this story in the comments of another HP fic.

In this story, Molly is bi with a preference for women, and has quite a case of internalized homophobia to work through.
Arthur is poly and bi, with no preference. One day, while he is out in the muggle world, admiring the people, their inventions, culture, everything, he finds a small, but very nice tea shop in Edinburgh. This shop belongs to a man named William, with his apartment above it.

I only have a phone to write on, so I hope you don't mind the formatting.