Soulmate AU where when you make first contact with your soulmate, you relive their best and worst day of their lives up to that point, making it feel like 48 hours have passed, when in reality, the flashback took seconds.
Elaboration: This gives you a good sense of how good or bad your soulmate's life has been so far. If their worst day was when they stepped in a puddle while wearing socks, they probably have a pretty good life.
EXAMPLE SHORT STORY:
TBC