Seeing as you've already done a drabble about nightmares, then logically one about dreams should follow. My suggestion would be something cozy, like a future where Nami and Y/N live in their small house with 2 or kids, Y'know, slice of life stuff.
What do you think was going through Nami‘s head when Y/N sacrificed himself by leaving himself behind at Bege’s castle? Was that moment when Nami finally realized she loves him?
@Beast_26_ I think she's known since the separation arc, but it made her more aware of how frightening it is to lose Y/N which made her want to tell him