When Harry was the reincarnation of Salazar, when Voldemort was the reincarnation of Godric.
When they don't even remember each other.
Until the last moment, the memory goes back.
In terms of CP, it's probably GS and VH. [Are they the same two people anyway?
Well, I wrote this after reading [Ryo Chikage]'s article where she was tortured to the point of being tortured XD
Intention: