Felicity knowing about Oliver’s past. Like they spent five months learning about one another and now they don’t have any secrets. Like something comes up about Oliver being in the Bratva and everyone else is like “when were you planning on telling us?” And Felicity just already knows.
And when her dad pops up, Oliver recognizes him. Cause they spent time in Vegas and Felicity showed him a picture of her and her father - the only picture she has of him.
And like Olicity finishing each other’s sentences. Not in a cutesy lovesick way but just naturally. Like Felicity trails off in the middle of an explanation cause she’s doing something on the computer so Oliver finishes explaining. Or Oliver is trying to tell a story from his past and can’t finish so Felicity steps in and does it for him.
Like at some point early on in the Season I want them out of the lovedovey honeymoon stage and settle into full on power couple. Just full on settled and happy in a committed relationship so that when shit hits the fan - as it will - they’re standing strong together. Where they cover each whether their facing an enemy or a friend.