My babysitting responsibility

One responsibly I was given where I had to babysit my two younger cousins. At first I didn't want to take this job but my aunt was offering to pay me so I ended up saying yes. For the first hour everything was so easy and better than expected because my two cousins were actually really bad. The next hour my nightmare came to life when I heard a lot of noise coming from there room. When I walked into there room I seen both of them jumping on the bed having a pillow fight. I told them both to stop and they did surprisingly and the oldest cousin out of the two was like: " hey look at this." I looked at him confused  and I watched run up to younger cousin who was smaller and jumped on the bed. I watched him flew up in the air and fell hitting the floor. At first I thought he had broke something but he ended up having a nose bleed. By the end of the night my aunt came home and I explain to her what happened but she ignored and paid me anyway.