Harry Potter and the Dogfather II: Chamber of Secrets

Harry learns before second year that he can speak Parseltongue and he has a rather disturbing inkling of why; Regulus remembers how much family means to him; Sirius enters fatherhood, trying to leave his demons behind him. But when horror, pain, and crushing loss threaten it all, they learn that leaving the past where it belongs is not so easy. (year 2 AU, Draco and Lucius bashing)