First Encounter

This is my first ever post. This story is real and was consensual, so please don't hate.
My mom took me to a family reunion at a park. I had never met most of the people there and it was a bit overwhelming.
I was 11 and a boy, about 13, struck up a conversation. We chatted a bit and he suggested we walk the trail since there wasn't much to do until it was time to eat. I wasn't sure about it but my mom told me to be polite and go play.
I should note that I became sexually active at a young age. I had already participated with neighbors and cousins playing house and doctor, but not with an older kid. As soon as we started walking I remember him talking about a boy at school that wore his belt funny. At first I didn't think much of it because I was struggling to keep up. I was an active boy, but his stride was twice mine and he had a fast pace.
As we walked, the people we crossed got fewer, then the sounds of their voices became more faint. The path went from pavement, to gravel, then dirt. I was so tired I was relieved when he suggested a break before we headed back.
Once again, he mentioned the boy at school with the belt, but this time asked if I wanted to see how he wore it. I agreed and expected him to show me since he was wearing a belt. I was surprised when he dropped to his knees and started moving my belt around.
I noticed his palm brushing against my privates and it wasn't long before I started getting an erection. I was embarrassed but he quickly told me it was normal and our secret. It didn't take long for him to have my shorts down and his mouth on my small erection.
After what seemed like forever he asked if I wanted to do him. I was happy to oblige, and yes, me and a neighbor my age had played before. I was surprise how big he was. I'd never played with a boy that had gone the puberty. He felt so big in my hand. I kissed and sucked enjoying every moment.
With my shorts still at my ankles, he told me to lie down. I had grinded against a boy and thought I understood his intentions, but was surprised when I felt him trying to enter me.
He was easy and felt amazing. I think he only got his head in but still remember him pumping his juices in me. After Cumming, his pace quickened and I loved his his hips thrusting against mine. This was my first time getting fucked by someone that could fill me up.
We finished and layed a while before we went back. I never seen him again.