Well you cant, because NTR is usually simply cheating, not cuckolding. Starts with "Ohh how terrible, i'm being raped (but secretly i want this very much, i might even keep it a secret to the viewer)" Proceeding with no resistance or weak resistance, some "dame!, dame!" and sex happens, sex happens again and girl finally loses all sense of self and become a braindead cumdumpster. That seems to be the regular NTR scenario, by imbeciles more than likely. At least make something properly or not at all
These stories are so retarded its almost fascinating xD