My sister at the time 3 I 12 I was feeling horny when I started rubbing my clit on the couch and saw my little sister sitting in her panties thought maybe I’ll try it on her, I started rubbing her clit through her panties and she liked it a lot, I rubbed her clit while I rubbed mine, after I came I stopped. It happened a month or so later when she asked for me to do it again so I did. I came hard once again, it happened a few more times until she was 5 then I stopped when I realised it was horrible.