Fics like There's Been a Mistake.

Objectively brilliant Healer/Doctor/Scientist Hermione Granger invents a new contraceptive spell that promises to change the face of sex forever. Her long-term friend-with-benefits Draco Malfoy is only too willing to let her test it on him. It goes horribly wrong. It goes so, so horribly wrong. ------------------------------ Draco didn’t understand the mechanics, nor the biology. He only had a baseline understanding of what it did. He knew that it involved pointing a wand at his balls and doing whatever it was she’d just done to his body that meant that he, all of sudden, couldn’t get her pregnant. Honestly, he was a little nervous about it. But it was Granger. What could possibly go wrong?

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