Once upon a time

I have decided to start writing stories about my ideas/thoughts. So:

Once upon a time there was a little boy named Steve. Now Steve was very curious about everything he saw. So curious that he asked about everything, so curious that he even tried to operate whatever he saw and do everything he saw.
One day Steve and his dad were at a tire shop and Steve was wandering around where he should not have been. He saw a man take an old tire off a wheel and put a new tire on with a curious machine. It was so fascinating that Steve snuck over to that machine after everyone was out of sight. He looked at the machine and he found the on/off switch that was so tempting! He looked around and determined that no one was paying any attention to him so he turned the machine on and as it had no-one controlling it the machine moved to the least resisting spot and closed as it was supposed to, only this time as it closed Steve found that it had closed on his finger and did it ever hurt. Well Steve quickly turned the silly machine off with his left hand as it had hold of hi right finger. The finger was so sore that Steve could not bare to try to move it.
On their way home Steve's father asked Steve if he had enjoyed himself. Well Steve had not enjoyed himself very much but afraid to tell his father what had happened as he did not want his father to leave him home next time. The next morning the finger was twice its normal size and when asked about it Steve would only say "I don't know".