Who: Sirius and Alecto What: Sneaking out at midnight When: A couple of days after their first encounter in the library Where: Sirius sneaks down to Slytherin and then to the library from there Rating: No higher than PG-13.
When the rest of his roommates went to sleep, Sirius went into James' cupboard to borrow his invisibility cloak (he figured if James knew it was about a girl, he wouldn't mind. At the very least, he'd never find out, so he supposed it didn't matter). Sirius crept out of bed, out of Gryffindor, and slipped on the cloak, making his way toward Slytherin. There would be nothing like a night of corrupting what seemed like an innocent girl, taking her around the school after-hours.