I've had this time to think about what I did and I realized that what I did to you was really unfair. I was reckless and irresponsible and you were right to try to make me realize what I'd done. I can't imagine how terrified I would have been if anything had happened to you, and I'm sorry I made you feel that way. I can't promise I won't ever do anything stupid again, but I am going to try to be more aware of how my actions affect others.
I'm sure you've probably been told that I'm receiving extra tutoring to get my magic under control, and even if Peony hadn't explicitly forbidden me to do anything like that again until I have the necessary skills, I've learned that I'm not ready. So I have promised to her and to myself (and now to you) that I am going to take this opportunity seriously. I want to learn and I want to improve, and that means more to me than anything else right now.
I never wanted to do anything to make you angry with me or disappointed (the disappointment is the worst part, I think). You're the most important person in my life.