So, I do not remember this story very well because I read it a few years ago but if you can help me I will be very grateful.
The fic tells Olivia that she was married to Edison and Fitz with Mellie (Fitz and Mellie have a daughter) and they end up meeting in a hospital, become lovers for a while until Mellie dies and they her daughter moves in with Fitz and Olivia, and I'm pretty sure she has a sequel.
I searched for years but never found it.