razor/cheated and para/nightmare are the same type of relationship just two very different tones
they both engage in spy vs spy, "my beautiful wife(gender neutral) who wants me dead", behavior - creating elaborate ways to try to kill each other but theyre both immortal pieces of gods so they cant die
but cheated and razor do it because it quickly becomes a game they BOTH enjoy (cheated takes longer to like it but he does find razor fun to be around once he realizes he just needs to cheat back)
para and nightmare do it because they hate each other so much but they cant get rid of each other. like the premise of their route is paras terrified refusal to let mare out and mares cruelly playful refusal to ever let para know a hint of peace
its why i love both