Beginning with the family

We had always been a relatively open family where sex was concerned. Any questions the kids had as they grew up, we answered honestly and my husband, John, and I, had never hidden our sexuality from our two kids, Emma and Ryan.
John and I had always had a mild kinky side, but we had never really explored our deepest secret fantasies or desires and to be honest, neither of us had really given it too much thought.
As the kids got older, naturally their curiosity about sex increased and we would from time to time find a web page open with porn images or movies and we would have a little chuckle about it.
One day I was cleaning up Emmas room and her phone vibrated to say she had a message. Being a nosey mum, I went to have a look and found she had her browser open on a hentai page depicting a brother and sister fucking. I began reading the story and started to get quite aroused and then suddenly had an attack of the guilts and put her phone down and left her room. I didn't say anything to her about it, but my mind would sometimes wander back to those images and I would get turned on.
About 3 months later, John and I were heading out for a date night and leaving the kids alone at home for the evening. We told them we would be home around 11 and Ryan saw us off at the gate, which we laughed at, as he obviously was keen to have no parental supervision for a while.
Unfortunately, as we were getting into the city, we got hit by a guy not paying attention and our car was undriveable. This put a real dampener on the evening and John and I decided to just grab a taxi and head home. we weren't overly worried, the other guy admitted fault and had insurance, so we knew it would be ok, just an inconvenience.
As we got closer to home in the cab, John told the driver which house was ours but he still stopped outside our neighbours house, which was fine and we got out, John paid him and we headed up our driveway.
As we walked up the drive, we thought it odd that the curtains were closed in the lounge, as we never closed them because we enjoyed the view down the drive across to the park. We got close to the door and we could hear the sounds of a couple fucking, and we looked at each other and said Emma must have gone out and Ryan must be watching porn, so we decided to sneak in the back door and scare him. I knew we might catch him wanking, but it didn't faze either of us as we knew he did it and it is a natural act anyway.
As we snuck up the hallway from the backdoor, the sounds of moaning and bodies coming together in the act of fucking grew louder and I suddenly had this feeling that something was odd, it didn't sound like it was coming from the tv. As John and I rounded the corner from the hall to the lounge, suddenly we were confronted with a sight neither of us was prepared for. Emma and Ryan were on the floor of the living room, coupled together and fucking crazily. In the split second between seeing them and reacting, we could see Ryans hard cock slamming into his sisters wet cunt. They noticed us at the same time as we spoke up to announce ourselves and they sprung apart and bolted for their rooms as both John and I were yelling, what the fuck, at them.
John and I were stunned and really didn't know what to do or say. We were so shocked.
I looked at him and we each knew we had to go and talk to them about this, but also didn't want to make a massive scene out of it, so I went and talked with Emma and John with Ryan.
Emma was crying in fear and just kept saying over and over that she was so sorry and please don't be mad. I assured her everything would be ok and said we would talk more about it tomorrow, but that she should go to bed and try and get some sleep and that her father and I would think about the best way to tackle this in the morning. John had a similar discussion with Ryan and we went to bed, confused, sad and a little angry, but I was also a little turned on at what I had witnessed, but I wasn't going to let anyone know that as I didn't want John thinking I was a sexual pervert and maybe divorcing me!
We talked quietly about it for a short while and decided we would try and take a calm and rational approach to it in the morning, rather than flying of the handle at the kids. We thought, it was just curious experimentation and they clearly didn't fully understand the gravity of what they were doing.
John and I always end every date night with a fuck and we decided after listening to some music for a while, that we shouldn't change that habit this evening, just because of everything that had happened since we first left the house and returned.
I always loved fucking John, he has a nice size cock and he looks deep into my eyes as he fucks me and I know he is really with me at that moment and I love looking into his eyes as he cums inside me, seeing that tortured ecstasy on his face.
As he went down on me to eat my eager cunt, he commented that someone was in the mood and nice and wet and for a second I thought he was going too connect the dots and figure out that I had been turned on by the sight of our children fucking, but he plowed in and started to eat me out, licking my hard clit until I began to cum. He kept lapping at my cunt as I lifted my hips into his face and I thought he was doing an outstanding job, he was really going for it. Then he climbed on top of me and put the head of his cock against my cunt lips, and normally at this point he would slowly press deep into me, but tonight he rammed his cock hard into my sopping cunt and began fucking me so hard I thought his cock might burst out through my back at any moment and impale me on the bed. Another thing that was different, was that he had his face buried in the pillow next to my head instead of looking into my eyes and I instantly knew something was different and when he exploded inside me it was with such a force that he nearly passed out. I knew he hadn't had an orgasm like that in years and instantly I knew he had been thinking the same thoughts as me and a flood of relief and also confusion overcame me. As he lay next to me spent, I quietly said to him that I knew he was thinking about the kids as we were fucking and that I had been having the same thoughts. He quickly said, so you were thinking that it was Ryan fucking you when I was inside you too? I said no and asked him if he had been imagining I was Emma as he fucked me and at first he stammered no, but I knew he was lying and told him it was ok and that the thought of Ryan fucking me turned me on.
We began to get horny again and soon John was rock hard again and as he rammed his cock into my cunt he began quietly saying Emmas name over and over and saying how nice it was to be inside his daughters wet cunt, so I began to call him Ryan and telling him to fuck me harder and to cum deep inside his mums cunt. Soon we were totally lost to it and exploded together and fell into a deep sleep.
The next day, the kids were slow up out of bed and we got them in the kitchen and quietly told them everything was ok and that we weren't mad and that to experiment was natural, but to do it together was very serious and as long as they knew that and kept what they had done within the family, everything would be just fine. Emma asked if we really didn't mind, as if it was a trick, and we said we understood and left it at that.
A week or 2 passed and everything returned pretty much to normal except that John and I were fucking like rabbits and I was bringing Emmas dirty panties into our bedroom for him to sniff as he fucked me which turned me on immensely.
Then one Tuesday I came home from work a little early and found John and Emma on the sofa and John was fingering Emma under her school uniform. He quickly stopped and was about to apologize, when I knealt in front of them and took Emmas hand and placed it on the bulge in her fathers pants and held her hand there feeling his cock twitch in his pants and with my other hand began rubbing her clit as it stood erect from its pink hood.
i then told her to undo her dads pants and we got him to remove them and I told her to suck his hard cock as I licked his balls. John was in ecstasy and soon told us to stop or he would blow his load, so I asked if it would be on my face or his baby girls. Emma was shocked and said she didn't know we were so freaky and we told her we would show her in time how dirty and kinky we were.
I told her to straddle her fathers lap and I held his cock upright for her to lower herself onto and my cunt literally contracted in a mini orgasm as I guided my husbands cock into our daughters hungry little cunt. John pumped away at her cunt for about a minute and then said they needed to stop or he would cum inside her. I told Emma to stay very still and worked out when she had last had her period and when she was next due and decided it was safe and told her to fuck her dad as hard as she wanted and not to stop even if he said to and she began to grind down hard on his cock and within seconds John was screaming that he was cumming and I watched as his balls contracted and I could see the base of his cock pumping hot cum into his girls cunt. Emma was not done though and kept riding his cock while John had a series of rolling orgasms until finally Emma grunted hard as she forced herself right down on her fathers cock, grinding her clit on his pubes.
As we all sat there recovering, Emma suddenly blurted out that Ryan used my panties to wank and that that was how she first saw his cock and they came to end up fucking, so John said to her that Emma should try and fuck her brother that night and take a pair of my dirty panties for him to smell as he fucked her and then we would come in and join them. Emma agreed and later that night we heard her go down the hall to her brothers room. We listened for any activity and sure enough we began to hear his squeaking bed giving away what they were doing, so John and I walked naked down the hall and entered Ryans room to see Emma riding his cock as he was licking my cunt stains from the crotch of my panties. Ryan froze for a second and then realised we were naked too and then I walked up to his bed and proceeded to straddle my sons face and told him to taste the real thing. His tongue went darting into my hole and a shiver of pleasure ran through me and I began to coach him on how to please me orally. Next I told Emma to go fuck her dad in our bed for a while and when Ryan and I were done we would join them, so off they went and I climbed onto my sons cock and began riding him, feeling his thick veiny cock sliding deep into the hole that he had been created in. I asked Ryan how many times he could shoot a load in one night and he said 2 or 3 times, so I told him as long as the first one is deep inside my cunt the rest we will see where they end up. He began fucking me harder and harder and then asked me if he could fuck me doggy style. I love when John fucks me doggy, but it's not his favourite position, so we don't do it often, so I was very keen to let Ryan do me that way if he wanted. As He began pistoning into me I suddenly felt him grab my hair and he began pulling it hard forcing me back onto his cock and he began telling me to fuck his cock like a real slut and I started cumming like an animal and screaming for him to fuck my slutty cunt and fill me with his load of cum, to use me as his whore and piece of fuckmeat, I was lost to the total depravity of what we were doing and then he exploded inside me and I felt his hot torrent pouring into me and instantly I began having the biggest orgasm of my life, rolling one into another until we both collapsed on his bed, soaking with sweat and panting furiously.
We could hear the sounds of John and Emma having fun and went to join them.
The night went on into the morning and ended with John cumming once more and Ryan for a second time, but this time Emma and I lay down and let them cum over our faces.
Sore and exhausted, we collapsed into sleep all together in our bed and awoke well into the afternoon and a new life that would never be the same again.