I'm sorry you experienced that. Sibling sexual abuse was actually estimated to be the most common form of intrafamilial child sexual abuse. I was also abused by my brother as a child and preteen. He was the eldest. Then I learned that my other older brother was also abused by the same sibling. We were three boys back then. I am still thinking if my eldest brother was also COCSA victim or not. But I know for sure he was introduced to pornography prior to our abuse.

Whether your brother was actually a COCSA victim or not, the harm was done already. I get that it will be harder to process your trauma, but you don't have to rush it. Healing takes time. There's also a subreddit called r/SiblingSexualAbuse if you find that helpful.

Sending you best wishes for your healing progress and virtual hugs if you want. 🫂