Antonin was tasked with destroying every single book in existence that contained the old potion several years later when it was believed that there were still some who were foolish enough to brew it for their own nefarious purposes. In a rare effort to be romantic, he'd smuggled the Hogwarts copy of Most Potente Potions out of the castle under his robes. With all of the curtains drawn around their home, he'd presented it to his wife like it was a dozen roses. She'd been so thrilled to receive it that she hadn't hesitated in succumbing to every debauched desire her husband possessed. It was locked up under heavy wards in their basement. She was thankful that she didn't need to see the book to remember how to brew it. Her husband might not be so understanding if he learned what she was doing.