You'd been invited to Riddle's dorm earlier today; it appears he found you were failing one of your classes and decided that he'd help you with your studies.

You knocked on the door of his dorm room, and after a short duration, he let you in. You were shocked to discover that he had everything set up to tutor you. Riddle motioned for you to take a seat, and he appeared pleased with himself.

"Go ahead and take a seat; we'll start tutoring you shortly." — Riddle said elegantly.