The ultimate ntr (for me), is when the girl becomes evil/sexy after being rape trained so many times, and plays with mc's obliviousness. So yeah just being "raped by x", is in a way the total opposite, so doesn't really do it for me.
And for those who would say "it's not realistic": yeah no shit lol, the whole idea isn't to see a traumatized girl being sad after being raped, it's to see pleasure corrupting a girl who then is truly "stolen" from the mc.
I want to fap, not take antidepressants.
This is also why so many games tagged as ntr aren't ntr at all, just rape drama, where the scenario is "girl a is raped in bad end 15 and dies".