I Broke My Sister's New Phone on Purpose

So I admit it, I got mad at my sister for borrowing my makeup without asking, and when she got a new phone the next day, I couldn't resist. I left her favorite charger in another room while she was on a call, hoping to teach her a lesson. She dropped the phone trying to reach the charger, and now it’s broken beyond repair. She doesn’t know it yet though. But every time I look at her new case lying around, I feel guilty. Is this normal for an oldest sibling? What should I do?