>>150944356
Undeniable at this point, knowing the writers, as early as S3E10, but it broke people's brains too much to accept at the time.
Possibly an idea being tossed around as early as S2E20. Possible cheeky hints at a loaded history between them while using Finn for sexy weird ex mindgames and harassment. Ako was a boarder who would go on to board a lot of bubbline eps.