Severus snorted at Harry's list of things that he'd done. He was amused that Faustus had zeroed in on Harry's inability at potions. His son had shown a definite interest in the subject, which understandably pleased him.
"He did all that and more," he said archly. "He was, for a great deal of time, the bane of my existence. The-Boy-Who-Lived-To-Irritate-Me."
He arched an eyebrow. "I remember a particularly memorable incident when I taught Defence Against the Dark Arts that very nearly had you in detention for life."