Okay kiddo, so there was a grown-up man named Moe who had a younger sister. Now, Moe started to have feelings for his sister that were not okay. You see, we love and care for our siblings, but we should never have romantic or sexual feelings towards them.
One day, Moe did something very bad. He acted on his feelings and did some things that were not safe or healthy with his sister. This is called incest.
When people found out about what Moe did, they were very upset and angry. Incest is not only wrong, but it is also against the law.
So kiddo, the important lesson here is that we should never have romantic or sexual feelings towards our siblings, and we should report anyone who does something bad like Moe did.