Sylvia und Sybille (modified reality of almost 14 year-old girl (16 instead) and a friend's Mum) turned into a play by Christa Winsloe (the girl Sylvia) & modern-setting theatre play by Daniela Löffner.)
This wonderful fast-paced love story deserves a lot of fans and a full-fledged fandom.

If you have an idea and want to write something, it would be very much appreciated. I would read a looot of fanfictions about the two, but alas, except mine, nothing yet (as of June, 2024.)

CREDITS: the header ("background image") is the fixed photo from the play found via Google (the first photo of the play I saw somewhere online), the avatar \ userpic ("profile picture") is a wonderful poster of the play posted by Daniela Löffner @ Instagram.
Both photos © Sebastian Hoppe

I haven't seen the play (I'm not even in Germany), but read bits and pieces as well as detailed summary of Christa Winsloe's original play. Some bits and pieces of the play in form of clips have been seen too, but later than I had got into SYSY (the perfect abbreviation  is by the theatre (TWO the same letters!)) My thought: it's also the pairing's name.
If you have ever read any of the fanfictions posted here, they're mine, and this is the place to have them all together.