looking for story Swap
https://storiesonline.net/s/61539/swap a story which was originally released as "Premier members only", not just because she has vanished.
I also like https://storiesonline.net/s/48789/past-lives - a similar story.
Yeah, that was pretty obvious.
I cheated, I went to https://storiesonline.net/library/authors.php?let=M and did a text search on "Friday".
Not to be confused with Girl Friday.