This happened many years ago when I was 16, I had a girlfriend Jayne who was 14 and we used to fuck like rabits whenever we got the house to ourselves. One day while we were banging away without a care in the world at her house (it was school holidays and her parents were at work and her brother had gone off to visit his grandad). Well to cut a long story short her younger brother must have come home early and he walked in us fucking in the middle of the lounge floor, he sttod for a few seconds then went and we heard him going off to his room.
Jayne and I were terrified, what the fuck were we going to do if he told his mom.
Jayne said quick you need to go talk to him you have to make sure he will not tell on us. I quickly pulled on my trousers and went to his room, Hi Paul I said look I am sorry about that what you saw before, he just said not as sorry as you will be when I tell mom. I said come on Paul you don't need to tell your mom, how about if Jayne and I take you out for a burger. He said were you trying to make a baby, I said no it was ok Jayne was on the pill and couldn't get pregnant. Then he really stunned me and said I wanna do it with her too. I said Paul that would not be right she is your sisterand you are only 13. He just said well she is only 14 so OK I will tell mom.
I said look Paul I will talk to Jayne but I don't think she is going to be happy to do that. I went down and told Jayne what had happened, she said he is a sick pervert there is no way I can do that. I told her I had told him that and that he said he would tell their mom, she said Oh my god what can we do, look she said tell him OK but I need you here with me please. We went up to Pauls room together and I told him, jayne lay on the bed naked and closed her eyes. Paul got his clothes off in no time and his cock was rock hard although quite small, he got between her legs and began trying to fuck her like he had seen me doing but his cock was not going in, I admit I was rock hard watching and I reached round and guided his cock into her. The sight of him banging away on his big sister gor me very excited and I began kissing Jayne on the lips, pretty soon she was responding to my kisses then I pushed Pauls mouth onto hers and she carried on responding to both his lips and his cock. After only a few more minutes I could tell he was cumming inside her, as soon as he was done he rolled off her and I buried my tongue inside her cum loaded pussy my cock was fit to burst as I ate her Jayne pushed Pauls mouth to my cock and he started sucking me, I would not have lasted long anyway but I came straight away when Jaybe pushed 2 fingers up my ass. Jayne Paul and I became a regular 3 some after that day and eventualy we worked Jaynes other sister into our fun too.