"You're a Gryffindor," Harry states, tapping against Sirius' name on the map.
"That's right," Sirius says, and gives Tom a quick grin.
"And Father is the bear of Slytherin," Harry says wisely.
Tom clears his throat. "I beg your pardon?"
"The heir, Harry," Sirius says, trying not to chuckle.
"Yeah, the Heir of Slytherin," Harry repeats, and gives Tom a smile that would melt anyone's heart, even that of a Dark wizard.