Goyle/Malfoy
You do of course realize that it's when you're cock deep into a witch that remembering a charm is the most important, right? Unless you're looking to create your own army of little Goyle bastards running about.
Fuck's sake Goyle, you don't act like it but I'd think you'd be smarter than this! How do you know Turpin or Capper or any of the idiots you shag are on potions or charms?