After dinner, Harry and Hermione had announced that they were headed to the library. And Sirius was sure that indeed, the library was where the betrothed couple would be found at this moment. But Sirius had not missed, during dinner, the half-lidded looks that the bookworm had been sending the Boy Who Lived. Sirius suspected that at this very moment, the couple was doing personal research on "The History of Snogging."