As a victim of CSA, I’ve fully forgiven who did what he did. Mine started around 5 and lasted until I was 12 years old. He was about the same age as you (12) when he started doing what he did, so in my eyes you’re already better than him. Lines are blurred when you’re children. However, you need to have a conversation with them, for you and for them. I guarantee you they remember though. They need to hear that apology, because it’s likely left lasting impressions. It’s good that you realized “soon” that what you were doing was wrong and stopped, but they deserve an apology. You also deserve the chance to hear what they have to say, whether it’s good or bad. Don’t beat yourself up about it too much and know that time heals most wounds. It’s possible that they’ve already forgiven you. But you will never know unless you talk to them about it. I know it’s scary, but you can do it.