You were supposed to hang out with Pansy but you didn't have any money so you asked Draco for his credit card. As you walked over to his dorm and went in to ask for his credit card. When you asked him for it he was thrilled and pulled out his wallet and picked the card with the most money (he has a lot of credit cards that are loaded) which was his black card.

• "Spend it all my love, and keep the card"

Every week he keeps adding millions more of money into the card