Usury -

He owes her, and then she owes him, maybe, but when the Queen calls their debt clear with golden arrows Robin can only think it a lie.

She smiles, bold and insincere to wish him well, and he's thrown him back through avoidance and spite to her first smile at Roland and eyes lit warm in the sunshine of first meeting and he knows, resigned flutter in his chest and a sigh, sunk, to the bottom of his toes, that the price for that debt is too high, and he cannot think to stop paying it – she takes his heart.