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In spite of himself, his thoughts about love cropped up again, and he couldn’t ignore the implications. Calypso couldn’t possibly have known the impact of what she’d said to him, unless she’d done a great deal more research into their family than he’d ever observed. After all, if he took into account the other parts of their ancestry it really was no wonder... and there was a reason, after all, that Malfoy family marriage contracts had an escape clause. They were like unicorns, with only one perfect partner. If his child had fallen in love with Potter so quickly after a simple potions accident had changed nothing more than the body, then he supposed he should actually be grateful on some level that Draco had managed to turn himself into a girl, rather than never finding love at all, and spending his life in pointless competition with the one who was his true match. It galled that it was Potter, but then, nobody had ever gotten as far under Draco’s skin as Potter, even before all this happened, so he supposed he should have seen it before now. It was the dark side of the legacy of one of their long distant ancestors. If ever a Siren found love, and that love was lost, she would mourn her lost love for the rest of her days. Once, a Wizard found love with such a creature, and they had a son, but the Wizard was faithless and left her, and she named her son Mal-Foi as a reminder to herself, but it was too late, and she eventually died of grief. Thus was born the Malfoy line.

http://www.tthfanfic.org/Story-16165-26/