Seeing my friends cock

When me and my friend were both 6 (we are both guys) we decided to compare cocks. I didn't think it was a big deal so I went in to the bathroom with him. His little sister tried to come but we told her it was only for guys.We took each price of clothing off one by one until we were completely nude. He then suggested we took photos so we posed and took photos of each other's cocks.Since then we have still been best friends and have never talked about that day again.