Harry never expected that his soulmate would be Draco Malfoy's sibling.

Draco, however, has known for years and has deliberately kept them apart.

Post-War. Eighth year.

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When a person casts a corporeal Patronus for the first time, a mark in its shape appears on their soulmate.

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"He knows. Harry could see it in the tight line of Draco’s jaw, the flicker of his gaze toward the mark. He was there the first time I cast my Patronus. He’s known this whole time.

'Oh, come off it, Potter,' Draco snapped, rising from his seat with a sneer. 'Malfoys don’t entertain that soulmate mark rubbish. We marry for legacy, not for... fate.'"