A one shot story made by me! Sirius black taking care of baby Harry and when he puts him to sleep he whistles a tune him and regulus whistles and regulus does the same but with baby Draco and years later in hogwarts Harry and Ron is forced to study with Hermione and while he studies he remembers the tune Sirius whistled to him and whistles it himself and Draco who's with his friends Blaise and pansy hears Harry whistling the tune regulus did and whistles back to him