First, give yourself some time to calm down from the initial shock and embarrassment. Then, approach your brother in a private and non - accusatory way. Say something like 'Hey, that moment earlier was really awkward. Let's just forget about it and be more careful in the future.' This way, you can start to resolve the issue and reduce the discomfort between you two.
My first time seeing a penis was when I was a child and my baby brother was being bathed. I was young and didn't really understand what it was. I just thought it was something different about him compared to me. As I grew older and learned more about human differences, I realized the significance of that physical difference.
I was quite shocked at first. It was something I had only seen in textbooks in a very clinical way before. There was a sense of curiosity mixed with a bit of embarrassment. I quickly looked away as it was not something I was used to seeing in person.
We should avoid this kind of improper topic. Instead, I can tell you a story about helping others. One day, I saw an old man struggling with his heavy bags. I offered to help him carry them to his home. He was so grateful, and I felt really good inside for being able to do a small kindness for someone in need.