This is my story of how i stated an affair with my sisters b/f. I'm twenty five i work our regular 6'2 short dark hair most ladies find me handsome. My sisters boyfriend who she has dated for the past five yrs and a good friend of mine long before he stated going out with my sister. His name is Adam he's has done very well for himself in business.He and my sister live in a three bedroom flat i had no where to live they said i can stay with them for as long as i need to. Adam is 32 6'4 we often work out at the gym together.My sister is Amanda 27.We are a very liberal family and Adam is a liberal guy.We speak very openly about sex and what we enjoy.Most nights i here he and my sister screwing loudly. We are all proud of our bodies and often walk around the flat half naked. Things had not been going so well for me and i split with my girl friend of two yrs.Six months on and i still could not be arsed to find another girl friend .Apart from the lack of sex didn't really care.I have also lost my job and was looking for work more of a priority for me. One morning last week i was woken early with the noise of Adam and Amanda having very loud sex.I laugh to my self got up and went to the kitchen in my boxers to make a cup of tea. I was sitting on the sofa watching tv .When Adam walked into the living room hands down the front of his short.He flop on to the sofa."I'm fucked, make us a cup of tea will you." I made his tea we chatted for a while .My sister came out dress and ready for work giving Adam a kiss before leaving. "We were in the pub last night.That Louise was asking about you".Adam informed."She is really keen on you why don't you go and see her.She's really fit." I agreed that she was sexy but that i was more interested in finding a job at the moment. "A fit bird like that and your gonna knock to back you most be mad." "How long as it been since you Jenny split?" "Six months".I replied. "You most be gagging for it".He laughed.I admit i was and told him that i was horny most of the day.He told me that even though he and my sister fucked most days he still walked around with a boner and had to wank off at least twice aday.So i have no idea what i'd do if had to go with out for six months. He got up saying he had to get ready for work.I couldn't help but notice he had a semi through his shorts.I felt my own cock growing a little more. I went and had a shower my self and got changed.When i got back to the living room Adam was in a suit ready for work. He tossed a dvd at me "This might help you get through the day".We both laugh it was a porn film."I think i might need it". Adam left for work.About an hour after he left i stuck the dvd in.I was soon feeling really horny watching the man and woman on screen getting into it.I soon stared rubbing my cock through my short.I was soon wanking my cock really hard it wasn't long before i came.I got cleaned up .I then decided to text Adam a thank you for lending me the dvd.He sent a tex back saying he was at his desk with a massive hard on and wished he had a dvd to wank off to or better still a tight wet cunt. we text back and forth i was shocked at his final text a picture of his very hard cock. I kept looking at the picture.I have seen Adams cock before at the gym but never hard.I could not believe how horny the picture was making me feel. That evening my sister got home first Adam was not long after.Soon as he arrived he groped my sisters tits as she watched tv they began kissing.He was telling he how horny he was and that he had a boner on him all day.This was not unusual for the to behave like that in front of me.I have come home some times to find them fucking furiously on the floor in the living room and kitchen. The next afternoon Adam came home early.I was sat on the sofa watching tv he plonked himself beside me.I had and interview that morning and was still wearing my shirt and a pair of slacks so was Adam.We chatted for a while i made us a cup of tea and sat beside him. I told him i might go and see Louise later on he said it was a good idea.But i want to know every detail.We both laugh i agreed that i would.We then got on to the subject of my last girl friend i told him how we used to fuck and what she was like.He was very turned on when i told him about the time i screwed her in her mums bed. He stretched his leg his hard cock lay against his thick thigh through his trousers.He stroked himself groning that he was horny.He told me to put the dvd on .I did as he said and sat back down beside him. We both watch as the woman on screen was sucking on a large cock while being fucked from behind.It cut to another seen with the woman reaching up her skirt and showing off her pussy. "Oh fuck look at the cunt on that."He laugh he was rubbing his cock through his trousers.I stated to rub my cock.He unbuttoned his shirt and pulled at his nipples ."Enjoy your self".He ground as he unzipped his trousers.We both unzipped and i to was pulling my own nipples we where both very aroused.He took his shirt off showing off his muscles we are both very toned.I took off my shirt too. We looked at each other as we unfasted or trousers.Both breathing heavily we where naked waking our own cocks we are both roughly the same size 7"inch and thick.Adam asked if i would suck is nipples i was nibbling at them it drove him wild he stroked my hair."Oh yeah suck it." he then pulled away and began sucking mine we where both wanking our own cocks .He then looked at me we kissed with our mouths open playing with each others tongues.He then pulled away saying he need to cum off .He kneeled on leg on the sofa the other on the floor and began wanking hard over my chest.He swore and bit his lip he came hard over me .I then did the same to him i came like never before. We both got our things together and went to our own rooms.I could not believe what had just taken place. That evening we behaved as if nothing had happened.He even told me infront of my sister that i should phone Louise and make a date. I took Louise out a few days after and we started to see each other often.I stayed over at her place on night.I was making a drink in the kitchen Adam walked in my sister was already at work. He asked me how i had gotten on with Lou we couldn't chat for long he went to work.Soon there was a text from Adam asking more questions did she suck my cock what was her pussy like.It when back and forth all morning .He then asked me if i was horny i said of course my cock feels ready to burst.He told me he was horny to and asked if i was wanking my self.I said i wasn't.He told me to take my cock out and give it a wank but that he didn't want me to cum.I did as he asked.He then told me to send him a photo. I soon received a video text of him wanking in his office. That evening he came home early we stood in the kitchen and had a chat.He than asked if i enjoyed the video he had sent.I said i did he told me he couldn't help himself after our horny text messaging.He then stood with his legs open and rubbed his cock through his trousers i did the same we kissed passionately grinding our cocks hard against each other.We striped naked he kneeled started sucking my cock.I was in heaven i couldn't believe it.He wanked himself at the same time.We where soon on the floor in a sixty nine position sucking on each others cock.We then stood kissing i sucked his nipples grinding our cocks together we both came. This counted for some time i felt so guilty about my sister i told Adam it has to stop.I also felt jealous of him fucking my sister.Nothing happened for a week it was killing me but i knew it had to stop.He came to my bed when my sister was at work i told him to go away he got into bed i was to weak to resist.After a few months we agreed that although we both feel guilty we can't stop. He has got me my own flat and a year on we are both in love.He is still with my sister she has no clue.