A modern day girl/guy somehow wakes up in New Vegas, where all the companions know her/him as the Courier and have battled alongside her/him. The Courier has no idea what they're talking about, they're from 2011, not from this place. Up to you whether the Courier fulfills their New Vegas role.

Bonus points for F!Courier/Boone, maybe he's trying to jog her memory.
(sorry if i did this wrong, i'm new to the falloutkinkmeme)