Irma Pince and Peter Pettigrew
Although he hated to admit it, Peter had had a bit of a crush on the Hogwarts librarian when he was in his third and fourth years. Even though she wasn't that attractive in Harry's day, she had a certain appeal for Peter, maybe it was the older woman thing. Once he had admitted in one of the regular Gryffindor common room games of truth or dare. The marauders, particularly Sirius had found it hilarious, and from then he vowed to keep all of his crushes and secrets secret just as they were supposed to be. Even years on, he could still remember how he thought about Hogwarts librarian back then. Of course, he hadn't been able to keep it secret from Voldemort, no one ever could keep any secrets from the master legilmens. So, as Irma Pince lay before him he felt the cold hard wood of his wand in his hand, and he had to make a choice between his life or his past