When I was 12 and my little sister was 5. I asked her about masturbating, then how to do it. We would both masturbate together and show each other how we would masturbate by touching each other genitals. After she asked if she could massage my butt. Then I agreed, surprisingly. No I didn't teach her about massaging butts, I didn't know you could massage it when I was 12. No force/hitting was involved. But due to her age, I think it is molesting. This didn't go on for a long time, (only did it around 3 times in all about a week) I finally realize it was wrong few days later and I told her "Let's stop doing this.". It stopped and we did not do it ever again. Definitely not planning to either. I had no attraction towards her. I feel really guilty. Is this consider as any type of molesting/sexual abuse/assault? Please be honest. Also, what should I do to help my sister if it have affected her? How do I get rid of the guilt I have?