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Moonwater always pretending and denying that Barty isn't their third, like they don't dominate the hell out of him in bed every other night, like Barty doesn't sit between them in the great hall, like Barty isn't asleep between them while Regulus and Remus read late into the night, like half the time Barty isn't sat in Regulus' lap during their classes.
It's a soft, toxic relationship because they never deny Barty affection (have kissed him in front of multiple people) they just deny that they are in a relationship with him.
I always LOVE to imagine bartylus as that one toxic couple that would break up and get together an break up and get together again and you're their neighbour just listening to them fight all the time but also fuck every night