I've had this fic idea for the longest time and your post about illusions reminded me of it, basically it's a total ripoff of djinns in spn showing ppl what they want most, very land of the lotus eaters
Jaskier's stuck in this idyllic illusion where he and Geralt are together and everything's perfect, they travel and fight monsters and Jaskier sings songs but Geralt never gets hurt and Jaskier doesn't sleep around, they're together and in love and it's wonderful
And then Jaskier gets ripped out of it, finds out it was all an illusion and he's devastated bc now he's had what he wants most and thinks he'll never have it again, not really, and it's driving him crazy
Geralt eventually takes him to Yen to see if she can help, thinking maybe there's lingering effects of being trapped in whatever illusion Jaskier was put in, and Yen's prodding trying to figure out what he saw in the illusion, what was so wonderful he nearly wants to be put back into it, and Jaskier finally snaps, "He loved me back!"
ohhhhh shit i dig this!!!