Did I Go Too Far? (слэш)

Inspired by prompts From house of Snarry discord!
Prompt: AITA for punching my boyfriend's uncle and breaking his nose.
Second prompt: After the war, Severus goes to therapy and finds, to his immense discomfort, that emotional constipation can be cleared up, if you think of therapy as a very thorough emotional laxative. As a direct result, he's in touch with his emotions, and actually slightly sensitive to insults. It's like being a child all over again, except he knows the jabs always hurt and he'd just gotten used to ignoring it. Now he can't, and he's paying in dividends for the years he spent being a git, as people see no harm in slinging insults at him, hurting his feelings. Enter Harry, who doesn't like it when people upset his friend/lover/colleague. And 'proportional response' may or may not have been a class he failed. Severus may have learned to feel his emotions again, and even appreciate having them... but that doesn't mean he can't also enjoy the view when the Savior of the Wizarding World comes storming in, all beauty and fury, to tell off a random shopkeeper for being mean to him.