Having sex with your sister

I was twelve and my sister was thirteen. we played around a lot with our clothes on. as fate would have it she grabbed my dick. she wanted to play with it out of my clothes so I let her. She did not know anything about a boy other than what the other girl would tell her. A few days later the parents left us home for the night by our selves. about an hour after they left sis said she wanted to sleep with me to be safer, i agreed it would be ok. So we got our bathes and went to bed naked. I got a hard on like never before. we kissed a lot then she moved to my dick about the third really good suck I lot it. she took it all the way as I was coming so it had no place to go but down her throat. reaching under her pillow she pulled out a condom. Still hard as a rock she rolled it on me. she laughed about it was just the right size did not waste any. she got on top putting it in herself slowly letting herself down on it. She said this shit hurts like hell and they call it fun. after many tired she finally made it all the way down. She would raise herself off me slowly then back down. after an hour or so she said just how long it before I have that good feeling. We got off the bed and went to the bathroom when I turned on the light I saw the blood all over me. She said OMG I am bleeding like my period. WE cleaned up. when I went back to my bed it had blood all over it too. We changed the sheet and put the bloody ones in the washing machine and washed and dried them. We still have sex when we are alone. we both love oral sex the best. I found out how to make the G spot work and it drive her up the wall. Now tell me what we done was not normal for brother and sister to do. She has three kids now and I have two but we still love to give each other oral when we can. What I want to know should I stop this or keep my mouth shut. should I tell anyone or not. Has this ever happened to someone else