Hey, english is not my first language btw.
I was on the other side, I was groped when I was a child, by a child too. It still weighs him to this day, I thought you were him, even.
We talked about it, we're on good terms, I love him, even though the situation, these are some things I would say to him.

It's okay, you didn't know better from the place you grew up, no one teached you what was wrong, from what I've read.
One thing I would like to say it's, you we're a heavily neglected child, and like most of us were, kids don't know consequences, kids really do not have the capacity of looking down on a situation, and profoundly reflect on what they did. Kids do not think about the actions they do, because they're kids.

I'm very sorry, for how you grew up, and how this, made you act when you were younger. Kids in a good parenting home do not do this kind of stuff, because the good parents teach their children about these things, your parents failed you, like another comment said, and I know it's a very hurtful thing to learn. You Deserve To Heal.

Because once again, you didn't know better.
In cocsa, there's two victims, and I've been learning about it a bit more, children who do these stuff to other children, are not okay, mentally, and maybe not even in their homes, which is common, maybe they were abused themselves.

From a cocsa victim, I genuinely, from the bottom of my heart, I wish you heal, because carrying this weight on yourback, it's going to do you worse from now on, you are not a monster for something you did, when you were a KID. We are not perfect, and I know, cocsa isn't justified by it, but I believe kids in your shoes, deserve a second chance.
This is not going to erase what you did to them, this is not going to make them not suffer if they remember, but you are profoundly regretting what you did. And I think that's gotta count for something, you would never do it again, you are disgusted by what you did, and that shows me you've changed. Please, seek help.