i will touch you with my mind
It has been a pattern throughout Regulus' life, choosing to ignore his brother's advice and always ending up paying the fucking consequences.
It started with a tree, and a branch, and a broken arm. Then it was a friend, betrayal, and a heartbreak. And after that, his parents, a warning, and a lesson. It never stops, because Regulus never learns, and Sirius is always right.
That was until James Potter. He looks as much of a mistake as all the ones that came before him, but this might actually be the time Regulus breaks the fucking cycle.