I’m a 30 year old male, married to my 25 year old wife, who has an older 35 year old sister. My wife and her sister are very similar with their looks and physique. My wife is around 5’6″ of slim athletic build, her sister is slightly shorter, say 5’4″ and quite petite.

We have holidayed with my wife’s sister on several occasions over the years so I’ve gotten to know her body quite well, seeing her regularly in a bikini and summerwear. Given that she looks so similar to my wife, I had always found her attractive, before I started having more sexual thoughts about her. I found out one day a few years back that she used to be a dancer in a nightclub in her teenage years. At first I pictured her to be one of these girls who dances on stage in skimpy tops and skirts, until recently when an old friend of mine said that he had seen her dancing topless a seedy underground club back in the day. We’ve always been friendly, and remain friendly, but since that day I have had more naughty thoughts about her. She became the image in my mind many times while jacking off over the coming weeks and months. I enjoyed the thoughts because I knew they were wrong, but I knew that I liked them.

Last summer, me, my wife, her sister and her husband went on holiday together. My wife’s sister had really got herself into a great shape. I knew she would diet before going away to try and look her best, but this year she had been going to the gym and it showed. When we went out on the last night, she wore a short dress with some high heels which really showed off her athletic legs. I’d always had a thing about legs, and the sight of her pins that night only reaffirmed this and brought my mind back to her working in that seedy underground club. We’d had a few drinks, the others had gone to bed and I was feeling a bit risky, so I questioned her about the her work as a dancer. At first she was quite defensive, then became very embarrassed and up tight about the whole thing. I could tell that I wasn’t supposed to know, that her family didn’t know and most certainly that her now husband didn’t know anything about it, but at the same time, when she started opening up to me, I could see that sparkle in her eye, that naughty sparkle which told me that she quite enjoyed the extrovert side of the work she did. I promised to keep this little secret to myself, and complimented her on her honesty. I even went as far as to tell her that she shouldn’t be embarrassed to talk about it because she had such a good body and that she would still turn heads now at the age of 35. With that, she thanked me for being so kind, stood up, gave me a kiss on the cheek and went off to bed.

The next morning we all decided to get ready in our hotel apartment to head down to the beac before heading to the airport in the evening to fly home. My wife had gone to the local shop, her sister and her husband were in their bedroom and I was in mine. My wife had left our bedroom door open so when her sister came out in the morning, I could see straight through to the foot of her bed in her room. “Morning you” she whispered towards me as she went into the bathroom. We had always had a very friendly nature about our relationship, but I could sense a shift since the conversation about her being a topless dancer. A shift that was towards the thoughts that I had been having when pleasuring myself the night before. She left the bathroom and went back into her bedroom to get ready. This time though, she didn’t close the door. I could hear her talking to her husband, asking which bikini she should wear that day. She picked up a gorgeous skimpy white number and a bright pink combo and asked him to pick. I could tell from the tone of his reply that he didn’t care and that he wasn’t giving her the attention that she craved. She put the white one on the bed and the pink back in the case, glanced towards my room where she could see but he couldn’t from the other end of the bed and began to remove the tshirt that she had wore for bed the night before. My heart raced as she revealed her beautiful pert breasts. Not big breasts but boy were they good.They were everything that I’d imagined and more! Now I could tell why she was a topless dancer, her naked body was fantastic. Her long blonde hair flowed down over her pert nipples which lead to her toned stomach and black lacey shorts. Her breasts were small but perfectly formed with gorgeous nipples and areoles to die for. She turned her back to me and slid the shorts down over her tight ass, revealing her firm cheeks and a glimpse of her smooth gleaming pink pussy lips between her legs. My heart was racing even more! I could feel my dick throbbing under the sheets as I watched on in awe. At this moment, my wife arrived back into the apartment and her (now fully clothed) sister came out the bedroom to greet her.

“Morning honey” she said to me as she came in. “Hurry up and get ready please so we can go to the beach”. I had to wait for her to leave the room before getting out of bed, as the big hard pole in my shorts might have posed a few questions from her.

All the way to the beach, all I could think of was what I had just seen. This while me, my wife and her sister walking down there while her husband lay back in bed. When we arrived at the beach my wife lay on her front and asked me to rub sun cream into her back and the backs of her legs. Then after I’d finished, she amazingly asked if I could do the same for her sister seeing as though nobody was there to do hers. I was firm rubbing the lotion into her back, firm but quick, trying not to let the semi in my shorts get any harder. When rubbing the lotion into the backs of her thighs, I brushed the edge of my hand and my thumb into her pussy where I felt her body tense up each time I made contact. One stroke after another, up her gorgeous bronzed smooth legs with the occasional contact with her crotch. Her legs were simply stunning. Her calf muscles were so soft and smoothly shaved while her thighs were solid muscle and toned. I didn’t want to finish but also didn’t want to overdo things with my wife lying only a few feet away. I made out as though I was tired and lay on my front on my own towel for a few minutes, whereas in reality I was giving myself time for my raging boner to calm down! The rest of that afternoon went pretty quietly as I lay there, soaking up the rays in between these two gorgeous blondes. My mind raced over what had gone on over the previous 24 hours and I always had her lying next to me, to remind me what I was fantasising about. I always wore my sunglasses at the beach – the official line was that it was too bright – the reality was that it allowed me to stare at my sister in law each and every time she walked down to the water and then back again, with the sea water dripping from her amazing body skantly clad in that little white two piece bikini and boy did I take advantage of that on this day. Why did this have to be the last day of our holiday just as things were heating up. I swear she was going into the water more often just to get my attention more often.

The flight home was a late one, leaving at midnight. I was sat in the aisle seat, with my wife at the window and her sister next to me. An hour or so into the flight my wife dropped off to sleep with her head resting against the window. Her sister couldn’t get comfortable, so asked if she could put her head on my leg, with her feet up on my wife’s legs. As she manoeuvred into position, she rolled a sweater up to use as a pillow on my leg and closed her eyes. So here I am, sitting wide awake on a plane surrounded by dozens of sleeping people, with my sister in law’s head within inches of my crotch. Thoughts of the past day raced through my mind, rubbing the sun tan lotion into her soft tender skin, her amazing body in that little white bikini, and of course, the glimpse I saw of my wife’s sister in the nude! I became a bit dazed in my thoughts, only coming round to reality when I felt a movement down below. I’d only gone and gotten myself a boner, right next to her head. This was awkward. She must have been able to feel it. Then, after a quick twitch of her head, eyes still shut, she manoeuvred the sweater over my legs and placed her hand underneath it, firmly on my dick. My eyes were wide open! Was this just her in her sleep getting comfortable or was it something more sinister? I don’t even know which I hoped it would be, but after my dick got even harder, I knew it was the latter. She pressed the palm of her hand hard into my dick and moved it up and down. I could barely contain myself. Everything I had dreamed of – getting my sister in law into this position, sexual tension rising, and we were stuck on a f**king plane! She continued to rub my throbbing dick so put my hand on her head and started striking her hair to let her know I was in approval. At one point, she even moved her head and quickly licked and sucked on my finger. I could feel the pre-cum in my pants! At this point my wife woke up and so her sister pretended to wake up too. The two of them sat up and her sister squeezed past me to go to the bathroom. As she did so, she cheekily pretended to fall and sat right into my crotch, still throbbing from the what she had been doing to it, she was sat right on my dick. She quickly jumped up, apologised and went to the bathroom, knowing that her little “stumble” was a deliberate act to excite me even more. For me, this was the riskiest but most exciting night of my life! It was the first time I had done anything like this, but fortunately it was not the last.

A few days passed with the thoughts of our holiday still going through my mind, when my sister in law rang me at work to ask if I could swing by her house and lift some boxes for her because she had hurt her back and her husband was out of town working for a few nights. I had a quiet afternoon at work planned so I left the office early and went to her house. When I arrived, she answered the door, still dressed in her work clothes herself.

“Hey Mike” she said provocatively “sorry to call you round like this”

She worked as a secretary in an office and dressed like one as well. That day, she wore a tight fitted white shirt which was unbuttoned to be quite low cut, with a black figure hugging pencil skirt and some pointed toe high heels with her hair tied up.

“It’s no problem” I replied, “I’m still not quite back in the work mode after our holiday”

“Me neither, I did have a lot of fun when were away, I don’t think I was ready to come home” she said.

She pointed me towards the kitchen where the boxes were and asked me to move them to the garage, which didn’t take me too long to do.

“So what’s up with your back” I asked as I walked back into the living room

“Uh I think I just tweaked it a little bit, maybe sleeping funny” she answered. “Maybe you could do me one more favour while you’re here if you have spare time please?”

“Sure, what is it?” I enquired

“Well it’s a bit awkward but I was going to ask if you could give me a little massage on my back to see if that will help it feel better” she muttered a little sheepishly. “I wasn’t going to ask, but with me being on my own for a few days and you seemed to have a magic touch on the beach the other day with that sun tan lotion. Also my sister didn’t mind you helping me then, so why would she now?”

The way she told me that I had the magic touch was very provocative indeed. I wondered if she was referring to that point where I managed to make contact with her inner thigh and pussy or whether I was getting a bit ahead of myself, but I thought ‘what the hell’ – let’s give it a go. After all, it was my wife who suggested I rub that sun tan lotion into my sister in the first place. I followed my wife’s sister upstairs and into her bedroom where she lay face down on the bed. I stood at the side of the bed and started massaging her back. I moved my hands towards the middle where she said the pain was.

“Yeah that’s the area” she said approvingly. “Why don’t you lift my shirt up a little bit to see if that makes it easier”

I slid her shirt up to reveal her still bronzed skin and continued to massage her back. I moved my hands a bit higher near the red bra strap that was covering her skin and continued.

“Aah that’s even better” she exclaimed.

Feeling a bit excitable, I decided to take a gamble and unhooked the clasp on her bra strap. I hoped she would approve, but still worried that I could get a slap in the face at any time.

“That’s easier, thanks” she said, which relieved me a great deal! I continued to massage her back for another five to ten minutes. Once again in the presence of my sister in law, I felt my dick starting to grow. My thoughts travelled back to that day on the beach. Here I was, standing by my sister in law’s bed massaging her half naked back with her red bra straps lying by her side onto the crisp white bed sheets.

“Mike, this is really easing my pain – but could you please be even more firm with me?” She asked. With this, she slid across the bed and motioned for me to get on top of her with my legs spread either side. I liked the vibe I was getting here and asked her to lift her arms above her head. As she did so, I pulled the shirt up and over her head and she tossed it onto the floor along with the red bra I had undone, which read 32B on the label. The situation seemed to be moving away from me giving her an innocent massage and towards something that I had only previously dreamt of.

I continued with my massage and grabbed a bottle of moisturiser off the bedside table.

“Do you mind if I use this” I asked

“Sure, that might help” she quickly responded. As I moved my hands up, down and around her back, I started wandering offline and including her sides in the equation. At one point, I started on her hips and ran my hands all the way up her sides. As I did so, my finger tips brushed the soft skin of the side of her breasts. She let out a little moan and lifted her body up a little bit off the bed to expose more of her breast to my hand. Another stroke back down to her hips and back up, this time making very deliberate contact.

“Mmmm Mike!” she let out softly. This was it now, no going back! She shuffled up onto her elbows, lifting her upper chest completely off the bed. I manouvered both hands slowly towards her breasts, slowly taking each one in the palm of my hand as I felt her hard, erect nipples make contact with my skin. She let out several loud pants and deep breaths, giving me approval to continue my adventure. I leant forward, softly nibbling the top of her ear before slowly kissing the side of her neck. She turned and put the palm of her hand on my cheek before our tongues met into a deep passionate, long kiss. Turning over exposed her bare breasts to my eyes for the first time since she was putting that white bikini on in the bedroom on holiday.

“Please don’t stop, you have such wonderful hands” she insisted. With that, she pulled the clip from holding her hair up, shook her gorgeous long blonde locks down, then rolled over so that I was now straddled on top of her again, but this time she was facing me. My hands wandered, my eyes wandered and my lips wandered. From another passionate kiss, I pulled my lips from hers and kissed down her neck and towards her breasts. I started moving my tongue over her nipples, slowly at first then speeding up. I continued my journey down her body, from her breasts to her stomach. Her abs were still tanned from our time in the sun and were very toned without an ounce of spare flesh on them. In fact, her breasts were the only pale flesh I could see – where her bikini had covered them in the sun.

“Oh Mike” she said, her voice beginning to tremble with pleasure. “I’ve been waiting for this since the last night on holiday when you were so nice to me. I’ve not stopped thinking about that day on the beach and the plane since.” I continued kissing down her stomach when I arrived at the top of her skirt. She reached down with her right hand, loosened the zip, arched her back and slid the skirt down over her hips, revealing her dripping, smooth pussy”

“Ooh, no panties huh?” I asked. “You’re quite the little minx”

“I rarely wear them Mike – I love the feel of fresh air on my pussy.”

Her pussy was perfectly cleanly shaved. Not one pubic hair in sight. I ran my tongue towards her inner thigh and onto her warm, wet, dripping cunt, circling around her clitoris, flicking it up and down with each movement.

“Oh my god Mike” she shrieked. “I’m in ecstasy here – please don’t stop!” I upped my pace and rhythm, for a few minutes after which I could feel her body begin to tense up.

“Please don’t stop, I’m, I’m, I’m CCUUUMMMING!!!” She yelled as I buried my face in between her legs. Her body squirmed, she grabbed my head pulled it hard towards her pussy as she arched her back and let out a squirt of warm cum… She lay there almost motionless for a few moments.

“WOW, I’ve never felt anything like that in my whole life. Now sit back because it’s your turn to enjoy yourself” she said provocatively. She pushed me back onto the bed and removed my shirt. Before my shirt had even hit the floor, her hands were on my belt buckle, pulling my trousers and underwear to the ground, unleashing my already rock hard dick.

“Mmmm Mike – your dick is even bigger than I imagined. Bigger than that day on the plane when I tried to get my hands on it then!”

As I sat back on the bed with my legs hanging over the side, she dropped to her knees and started running her tongue around the tip of my dick. She even lapped up a tiny bit of pre-cum that had appeared and swallowed it in a rush.

“Mmm, nice, I hope that’s a taste of things to come” she muttered in a sexual manner. With that, she moved her head downwards and took each of my balls into her mouth in turn. One ball at a time, she sucked them into her mouth before moving back to the other one. As she was doing this, she reached out with her left hand and wrapped her fingers around the shaft of my dick.

“Oh my god!” I let out “this feels soooo good.” I looked down to see my sister in law, with her wedding ring on her finger, stroking my dick, faster and faster, sucking my balls whilst looking up into my eyes. Then slowly, she moved her lips back towards the tip of my dick, this time taking the head into her mouth. The feeling of her warm tongue on my raging dick was nearly enough for me to blow my load right there and then. Her motion got faster and faster as she sucked my length with her hand cupping my rapidly filling balls.

“Let’s see if you like to play dirty” she said, looking me directly in the eyes. With that, she pulled her hair back into a pony tail, tied it back, and clamped her lips back around my manhood. This time though she took my whole length deep into her throat. She gagged slightly as she took my deeper and deeper.

“Fuck me Mike, fuck my face!!” she demanded. I sat up a bit and grabbed the back of her head, pushing my dick further and further into her face, in and out and a bit further in with each thrust. Her eyes began to water as she gagged and gagged a bit more. The look in her eye and the occasional moan let me know that she was enjoying this as much as I was. What a dirty little slut my sister in law is!!

I could feel myself reaching the point of no return, so I started fucking her face even harder. My balls were slapping off her chin, her gag reflex kicking in each time I went further. I took hold of her pony tail to get a better grip.

“Aahh oh oh shiiit – I’m cumming baby, I’m cumming” my body tensed as I was on the edge. She must have felt this and took my dick out of her mouth and wrapped her hand back around my shaft, pumping harder and harder. As she did so, I spurted out a long line of creamy cum right into her face, onto her chin and down her chest.

“Wow baby, you must have enjoyed that, I’m soaked” she said and swallowed the bit that had gone into her mouth as the rest of my cum dripped from her chin down onto her nipples. Her hands were covered too – even her wedding ring was covered in my semen!

“Jeeez, that was a blow job like no other I’ve ever had in my life” I exhaled as I lay back on the bed.

“You’re welcome honey – thank you for being such a help to me” she replied.

“Any time” I said

“Well I might just take you up on that offer” she said with a sly wink. “I’ll go get cleaned up and you’d better get back to your wife before she gets suspicious and stops you coming over here. We wouldn’t want that, would we??…”

Please leave your comments below and if you like the story, I can tell you about the next time my wife’s sister and I got carried away.