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Going off of the crossover discussion, would you Anons find more interesting a story of Nightmare girls being sent to a Toriko world but still ending up raped, or Toriko girls (or girls from any non-Nightmare Guilty IP) being sent to the Nightmare world and having to deal with cults and monsters? Consider both how the sex scenes would play out, as well as the non-sex scenes Guilty could explore, such as the Toriko girls figuring out things like monsters and magic exists, or the Nightmare girls being shocked at how much more peaceful a Toriko world is (but ending up raped anyway, showing there's a dark side to even a more peaceful, no-monster world)
It's a general thing I've noticed that ever since isekai and reverse isekai became a hit genre, a ton of stories just seem to slap it on as flavor text for zoomer market appeal when being a normal fantasy story would have done just fine, and rarely do they play with the shock or morality differences that would typically occur to someone from 21st century Japan being thrown into a medieval fantasy world, so that's why I included the second part for your consideration.
Personally given Guilty's a nukige company I'd say Toriko girls to the Nightmare world because monster and cult gangrape, but if Guilty is willing to put in the writing work it'd be super interesting to see a Nightmare girl reacting to a Toriko world.