My sister read the books so she's more familiar with this so credit to her, but Gendry was one of the first runaways to learn who Arya really was and he soured on her a bit because of her highborn status, but during their bonding at some point Arya proposes to him (can't remember if it's for the Starks to adopt him like Jon or Theon or an actual idea for marriage) and Gendry shrugs it off joking that he'd always have to call her "m'lady" regardless since he was still a scrubby nothing from the Bottoms.


They did a callback to that in this episode but Gendry definitely seemed a little more openly flirtatious, knowing what he knows now about his heritage.


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