Neville was surprised at the snippy tone he got; he had expected some reaction but not that one, especially about his new charges from his House.
"Well, those kinds of rivalries make for good sportsmanship, and where would Hogwarts be without great games of Quidditch?" he said, as he caught the hint and rose suddenly and quickly, "I appreciate your suggestions, of course," he added as he took a step away from Snape's desk. Neville turned back to Severus, and extended his hand, "Thank you, Sir, for giving me this opportunity. But how should I address you? Professor Snape? Headmaster? Sir? I can tell Severus is not an option."