After his conversation with Alecto in the common room, Amycus had made a snap decision. He'd gone upstairs and smoked a cigarette out the dormitory window, then brushed his teeth and stripped down to plain black boxers. All he had to do was find another pretty girl to look at, and prove to himself that his inexplicable and sudden attraction to his step-sister was, in fact, just a product of his recent sexual drought.
And so Amycus found himself in the Room of Requirement with a bunch of his peers in even less clothing than he was wearing. It wasn't so bad, being nearly naked, when you weren't the only one, and Amycus wasn't a bad-looking bloke by a long shot.
Getting drunk sounded like a good idea indeed, so he made his way to the drinks table, where he found himself next to one of his Quidditch teammates. He smiled at her.
"Hey, Rosie. You look nice," he said. He wasn't sure about the etiquette of lingerie parties, but one was normally supposed to compliment a girl on what she was wearing, right? At least at normal parties you were. And it was true; Amycus normally saw Rosetta in Quidditch armor, which was a far cry from her skimpy little dress thing.