"Quite right, take another ten points for Gryffindor." Hermione beamed, sharing her smile with Bellatrix, who seemed to give a curious look to her before returning her attention to the front of the class. "Yes, it’s a funny little potion," Professor Slughorn continued. "Desperately tricky to make and disastrous to get wrong. However, if brewed correctly, as this has been, you will find that all your endeavours tend to succeed.....at least until the effects wear off."