"I should have known better than to keep anything from you, shouldn’t I?" Severus gave him a sad smile, then pushed the photograph containing him, Lily and Regulus that Lupin had taken. Harry picked it up, recognition dawning on his face. "Regulus was my best friend and first love when I was at Hogwarts. He was a year younger than me and your mother, and the brother of Sirius Black. Of course, it was not his fault that he was born in a family of old wizards. His mother, Walburga Black, deeply admired the Dark Lord’s ambitions and ideal. So, when his brother ran away from home, Regulus became the heir to the family, and as his other relatives, like the Lestranges and Malfoys did, he was expected to become a Death Eater."