- Percy: Hey wise girl, you wanna hear a joke?
- Annabeth: Shoot me seaweed brain
- Percy: *clears throat* knock knock
- Annabeth: Who’s there?
- Percy: Mary
- Annabeth: Mary who?
- Percy: Marry me?
The prompt I mentioned: Maybe Steter - meeting online in a supernatural forum/chat. maybe AU meeting first time or somewhere in canon and them not realising who the other is.