Sure thing! Although there's no big source fic for it - it started with a snippet, but a lot of what came after was brainstorming conversations. It's ended up as a sandbox with lots of room to play around. We don't even know if it's taking place on a space station or a gothic manor.
The idea is that canon-universe Rose somehow replaces a Rose in another universe - but this other incarnation of her is evil, and made a pact with the (also very evil) horrorterrors to inflict psychosexual/physical pain on a harem and then sacrifice them.
It's a lot to read through though! And there were a bunch more conversations after that. It might be handy to know that there are various branches:
- Eldritchfuck Roseworld, standard: As above. Evil Rose and Evil John are both replaced by the canonverse versions, and each has a harem made up out of the other human kids and beta trolls, split along gender. The harems mistrust that Rose and John have changed, and the horrorterrors and their contract still have to be dealt with. - Dead John Branch: Evil John is not replaced, and one of the first things Rose does is to kill him and rescue the male harem. The traumatised and suspicious harems become even more so. Except for Sollux, who is in full Doom "wh0 cares" mode and ends up kind of close to Rose as a result, since he's the only one not terrified. - Ancestors Branch: Oops, there are troll ancestors in a pocket dimension in the basement who have been messed up by the horrorterrors directly for untold time. Now the young former harem members are determined to help them, even though they also fear and distrust adult trolls. - But Nice Branch: Happy harem! Waaaaaay less trauma in this version, much more consensual porn and woobies finding solace and trust and a new home. The big drama is that Doc Scratch blackmails and harasses the alpha kids before they join the harem, and after Rose and John save them, he's still in a position to cause trouble.
Re: Roseworld Thing
The idea is that canon-universe Rose somehow replaces a Rose in another universe - but this other incarnation of her is evil, and made a pact with the (also very evil) horrorterrors to inflict psychosexual/physical pain on a harem and then sacrifice them.
Here's the start of it all:
https://fail-fandomanon.dreamwidth.org/365775.html?thread=2133590735#cmt2133590735
It's a lot to read through though! And there were a bunch more conversations after that. It might be handy to know that there are various branches:
- Eldritchfuck Roseworld, standard: As above. Evil Rose and Evil John are both replaced by the canonverse versions, and each has a harem made up out of the other human kids and beta trolls, split along gender. The harems mistrust that Rose and John have changed, and the horrorterrors and their contract still have to be dealt with.
- Dead John Branch: Evil John is not replaced, and one of the first things Rose does is to kill him and rescue the male harem. The traumatised and suspicious harems become even more so. Except for Sollux, who is in full Doom "wh0 cares" mode and ends up kind of close to Rose as a result, since he's the only one not terrified.
- Ancestors Branch: Oops, there are troll ancestors in a pocket dimension in the basement who have been messed up by the horrorterrors directly for untold time. Now the young former harem members are determined to help them, even though they also fear and distrust adult trolls.
- But Nice Branch: Happy harem! Waaaaaay less trauma in this version, much more consensual porn and woobies finding solace and trust and a new home. The big drama is that Doc Scratch blackmails and harasses the alpha kids before they join the harem, and after Rose and John save them, he's still in a position to cause trouble.
There have been more ficlets written and collected here, whether as fics posted on AO3 or in the collection bookmarks:
https://archiveofourown.org/collections/EldritchfuckRoseworld/profile
https://archiveofourown.org/collections/EFRW_But_Nice/profile
Wow I hope all that is not overwhelming.