@ElfLord nick is right. the quora answers are right. you can go beyond being strangers in no time! here is how:

1. disable the hindsight
2. make subtle hints over a period of time, each one increasing in creepiness
3. be alone with the royal undressed
4. sprinkle some authority over your logic to cripple it for the moment. douse your victim in authority like the milgram experiment wasn't enough
5. traumatise both of yourselves
6. you will be strangers again shortly after
7. profit