Sex with younger sister

So this is going to be straight foward but when I was like 8 or 9 I found a porn DVD in parents room and took it and watched it and I ejaculated for the first time. A few weeks later I wanted to try what I saw. So I got my younger sister who was 7 or 8 and I had sex with her and you he to realize I was only a year older but that brings me to the question. I don't feel remorse or guilt about doing what I did because I was so young that I didn't know incest was wrong and other moral problems. But recently I've been think about the incident almost everyday and I wonder if my sister remembers even though she was 7. And I want to discuss it with her to get it off my back how should I bring this up with her ? Will she ven remember or will it scar her... Please help(this took place just about a decade ago.)

I would say leave it be, personally. Since you claim to have no remorse over this, it seems you're aware that this kind of experimentation sometimes happens between kids. Was there any force involved? Was she deeply upset at the time? If not, then I think it's best left alone. Is your relationship relatively healthy with her? Again, if so.... What happens as children, stays in childhood.

I think Snaga has a good suggestion there. The only thing i would add is you may want to speak to a qualified professional for your own peace of mind about it, or if you have ongoing issues around it.
Which I believe you don't need to have, given the circumstances. This doesn't have to affect your relationship with her. Youwere both very young. And as you say she may not even recall it, or if she has she may have made her own peace with it.
Does she appear to have normal opposite sex relationships? A good boyfriend, a group of friends, dating experience?
Sounds like you may just want affirmation that it's not something to stress about, and it sounds like it isn't. Just one of those childhood experiences that is not talked about openly because people are frequently uncomfortable around such topics.
Just my opinion.