WWTP=> Male POV -"Colder thy kiss" reveals love is complicated as he noticed that she was growing colder towards him and there was no way to thaw the ice between them
Porphyria's lover => Male POV - "She put my arm around her waist" demonstrates that love can be complicated because the persona knows he can't be with her because she is an upper class woman
The perspectives in WWTP and Porphyria's lover are similar