"No, he does not make me call him anything. I choose to call him Severus." She glares at the boy, suddenly looking much younger than she, "And yes I am dating him! I think he's a wonderful person and I'm sorry I don't know your history with him, but around me, please refrain from making jokes at his expense!"

She huffs for a moment, looking at the ground and regaining her composure. "I think I should like private lessons, if you don't mind dealing with Professor Snape's girlfriend." She sneers.