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Payne gets up, laughing at the glare Lillian was giving him.
"Sorry for tackling you, wife," he calls over his shoulder as he wanders over to the water's edge, taking off his tunic as he does so, seemingly forgetting that Lillian was, in fact, a woman, and probably didn't enjoy random men stripping in front of her.
Though, in this scenario I suppose it's safe to say that they're less strangers and more playful rivals with a flair for being overly flirty at times. And in context with what Lyanna did for money, well. . . she was sure to have done plenty to get close to some of her harder to reach marks.
Back on topic, however, it was clear that he did remember, as he kept his pants on as he waded into the pool of water.