you are Sirius Black (this takes place before Sirius runs away)

not as a shock but Walburga and Sirius were fighting again. Unbeknownst to them 14 year old Regulus was watching

Walburga_”Regulus is my son!, the only pure child in this family” she yelled to Sirius

his stormy eyes thundered, he clenches his fists. His teeth gritted before he speaks