In this context it doesnt matter.
Disclaimer: Im against censorship and I think everything should be legal when its fictional.
When we fap to hentai, real or fictiinal doesnt matter. So dont act outraged here. Whether fictional or not, shes shown in stark pedophilic imagery. If the anime just wanted to show their relationahip, it could do so without showing us her naked body. At least use subtle camera angles. The way it us, kt is full-on peso material and lets call it what it is.
Now, thats oK. I think pedophiles should have fictional stuff, because if you deny them even fiction, its no surprise many eventually go rape real children. But: I dont have to like such material, do i. And since ita gotten worse recently, i calles that out.