Thursday night? Aileen thought about it for a few seconds before it clicked that he meant when she'd told him she was planning on coming up to his dorm for sex. Silly bloke, actually believing her after so many times of her completely leading him on without giving him anything at all. Offering a small, amused grin at William, she shrugged a shoulder.
"I didn't have the password." Which was actually true, although she could have easily managed her way into the Hufflepuff common room. The younger the Hufflepuff, the more trusting and easy to manipulate they were. Plenty of first and second year Hufflepuffs traveled in and out of the common room for her to make her way in at some point during the evening.