Tell her about the age gap Evie. I want to see max awkwardness. "I don't recall it all, and but I'm nearly twice your age. No advantage fighting teenage hormones sadly."
Instead "we just fictional characters of book that I read before" would be much better if she told "history of your world represented as fairy tail book in my old world".
This wording is partly baggage of a trend in how Chinese novels handle isekai and any parallel worlds. A book world is often treated like a stable pocket dimension inside a magic scroll with unclear boundaries, but the rules mimicking reality. It's convenient since it dodges claims about what the real world should be, but I think it's from oldschool fantasy and not censorship worry.
I don't think that's the worldbuilding this time, just the common terms Yvonne used.
It's more obvious in the 'rapid transmigration' genre, and partly why that genre
sucks. Basically everyone is "paper people" who exists for power fantasy, like NPCs on rails, and paper people may not strictly be conscious which contributes to justifying brutality.
But some works use it in interesting ways and make it a simulation hypothesis mindgame where admins are from a higher layer of existence with their own problems only made worse by host lesbians possibly crashing the entire layer of existence by being uncompromisingly gay.