I love the summer, the short skirts, girls going braless, that whole sexy feeling that everyone seems to have. I love seeing my wife, Dianne showing off her body in a thin summer dress or a short mini skirt. We’ve been together over a decade and I’ve always encouraged her to show off her body. She proud of her herself and her figure. It’s a curvy size 12 with large hips and a lovely wobbly bum and 38dd boobs with thick nipples and large areoles. At first she was shy but over the years we’ve pushed thing further until now she’ll even deliberately flash a stranger her cleavage or thighs while we’re out. But to her friends and family she’s still shy and demure. Her sister Mel is another story. You’d never believe they were sisters. Mel has a slim size 8, almost boyish figure; slim hipped with much smaller boobs. In her youth she had a reputation as being a proper tart. However she’s settled down now in her early 30’s and has married John a friend of mine from way back. He delights in telling me that she’s still a whore but now it’s just for him. We go out as a group quite a lot and recently when the weather was sunny we decided to have a day by the sea in Blackpool. We hopped on the train and an hour later we were there. The day was hot and both girls looked great. Dianne was dressed in a short summer dress that clung to her figure and showed off her pretty legs. Mel wore tiny pink hot pants and a white crop top and the bright bikini top she was wearing as a bra was clearly visible through it. We spent most of the day boozing and laughing and generally having a good time. The girls both loved all the attention that they got from the many blokes on stag nights as well as the family men sneaking elicit glances at them. By the time we rolled onto the train home around 10 we were all very tipsy but all of us wanted to carry the party on. On the train there was a group of 4 lads eyeing up the girls. John and I teased the girls that they should give the lads a show. Dianne’s dress buttoned up the front and she obliged by casually unbuttoning her top couple of buttons until her large boobs were almost spilling out. I couldn’t help noting that John was also helping himself to a look at my wife’s ample cleavage. Mel joined in by popping to the loo and removing her bikini top. When she sat back in her seat her nipples clearly showed through the thin material of her top. She soon caught me looking and just winked back at me. The girls were in fits of giggles at the effect they’d had on the men on the train and we hailed a cab and all went back to our house. Once we got there we settled down and I opened a couple of bottles of wine and put a music channel on the TV. It hadn’t been on long when a video came on with some pop singer dressed like a soft porn star came on. The way she was dressed got us talking about porn and Mel asked if we had any. I admitted we did and she said I should put it on. When Dianne agreed I acquiesced and put one into the DVD player. It was one of Dianne’s favourites, mainly MMF threesomes and all the men had huge cocks and spunked huge loads over the sluts they were fucking. All the way through the girls were drinking and making lewd comments about the action on the screen. When the movie finished Mel indicated me with her wine glass and casually asked, “So go on Di, how does your hubby measure up?” Dianne smiled sweetly at me and said, “Well he enough for me aren’t you babe?” then she continued, “John must be a big boy, after all he’s keeping you happy and we all know how hard that is” “He’ll show you if you want he’s not shy are you hun?” John smiled and stood up His hands dropped to his jeans. “Well wanna see it girls?” He teased, I don’t know what I expected but both girls goaded him on and he unzipped and in one swift movement he pushed down his jeans and underwear and exposed his cock. Johns a strapping 6’1 and he was all in proportion. Even semi hard his cock looked impressive and quite a bit bigger than mine. John stepped out of his jeans and sat back in his chair clearly in no hurry to cover up his penis. Then came the thing I was dreading. “Come on let’s see yours.” said Mel. I looked at Dianne and she smiled and said, “Go on babe, it’s only fair.” So I stood up and turned away from them I dropped my jeans and underwear, they could see my arse and I heard Mel comment on it. I gave my cock a quick tug and spun round and showed them my dick. To my surprised Mel liked it a lot. I’m shaven while John is very hairy and she like that and told me with a smile that I had a cute cock. As she unashamedly looked and commented on my manhood I felt it swelling which she quickly drew attention to. “Your turn girls” said John “I’ll get my tits out for anyone” said Mel. He smiled at her and nodded at Dianne, “It’s not yours I wanna see” he said with a leer at my wife. “What do you think?” said Mel “Shall we give them a treat?” Dianne smiled and nodded then started unbuttoning her dress. It gaped open showing her beautiful body then she dropped it to the floor. She stood there in her bra and panties for just a few heartbeats then she pulled off her bra and exposed her breast to her Brother in Law. John was watching her and slowly stroking his now stiff cock. At the side of me Mel pulled her top over her head and also stood there topless, breasts exposed. Without even thinking I reached up and stroked her small, pert breast. She trembled slightly as I touched her and her nipple sprang to attention, then she smiled at me and I felt her breast in earnest. It was firmer than Dianne’s larger breasts but she shared the same nipples. There was no point trying to hide the fact that I was now fully erect and Mel gave my balls a little squeeze. “Come on girl’s” said John “You’ve seen our cock’s it’s only fair we see your pussy’s” I looked at Mel and I think this was a big step for her as she was having to think about it. But my wife never hesitated. She just pushed down her panties and showed off her hairy pussy. I couldn’t believe it. My wife was happy to get naked in front of John and he was making it very clear that he was looking. Mel obviously couldn’t let her older sister upstage her and she quickly followed suit and I had a close up view if her shaven mound. “Looks like we married the wrong sisters” John joked. It was as he and Dianne both had hairy genitals, while Mel and I were shaved. Without thinking I just joked back by saying, “Maybe we should swap.” It was said in a light hearted jokey manner but John looked my naked wife up and down with his big cock in his hand and said in a very serious voice, “Well I would, what about you guys?” I thought that was where the night would end but to my total amazement Dianne giggled and said, “Why not just for a night it could be fun” “Are you sure” I gasped, “Yeah, why not? Lighten up it can’t do any harm unless we let it. What do you think Mel?” she said. Mel was quiet for a long moment then whether it was the booze, the situation or just that she wouldn’t let her sister have one up on her she quietly said , “Ok, why not, but just this once.” Without even asking what I thought John then took Dianne’s hand and led her upstairs. I just sat there stunned for a while. My friend and brother in law had just taken my naked wife upstairs and he was without any doubt going to fuck her. Mel was naked in front of me, she looked as nervous as I felt. I poured her a glass of wine and we sat there silently for a few minutes. “What do you think their up to” I said breaking the silence. She smiled and said, “Well knowing John he’s fucking Dianne.” That finally made it sink in properly and I looked her naked body up and down and said, “Would you like to go to the other bedroom with me?” “Very much” she smiled and I took her hand and led her upstairs. As we past the main room there was the sound of the headboard banging against the wall and Dianne’s moans filled the air. Then abruptly the sounds stopped and I heard a man grunting. “Sounds like Dianne’s getting her pussy filled” said Mel. The thought at once sent a shiver down my spine and yet turned me on. It was all I could do not to open the door and go in. Mel was already naked and I took off my shirt and joined her on the small bed. It felt strange kissing her. I’ve never cheated and Mel was the first woman other than Dianne that I’d kissed in over a decade. Her hand wrapped around my erect penis while I groped her small firm tits. I then lay her back and licked her clit. She was already sopping wet and she was quickly groaning as her juiced dripped from her slit. I then started fingering her as I licked and within minutes she was swearing and moaning as she orgasmed and her juices literally gushed from her open cunt. “Fucking hell!” She gasped “that’s never happened before” “We aim to please” I smiled. Mel smiled back then pushed me onto my back and took my cock in her mouth. She was every bit as accomplished a cocksucker as her sister. I watched as my cock glistened and slipped in and out of her mouth, unable to believe this was my wife’s baby sister. She soon had me moaning and writhing. She teased me for a gloriously long time then she straddled me and pushed my penis into herself and then she fucked me. She bounced on my cock and ground her body into mine. Before she clung on tight to me and shuddered through her second orgasm. She collapsed off me but I wanted more and bent her over the bed before entering her from behind. I gripped her slim hips and fucked her hard. By the time I felt my spunk rising Mel was virtually sobbing for me to cum. I didn’t disappoint her and I gripped her tight, thrust deep into her sopping cunt and filled her with my sticky seed, before collapsing on top of her, moments later we fell asleep in one another’s arms. In the morning I woke her by softly stroking her pussy lips. Her eyes opened as I slipped a finger inside her. “Would it be very naughty to fuck you one last time” I asked with a smile. As a reply she kissed me and her hand masturbated my cock. I climbed aboard and pushed my cock inside her. We had a lovely slow fuck. I took my time with her and explored every inch of her tight slim body. To be honest Dianne was forgotten as finally I emptied my balls over Mel’s small, heaving breasts. After we’d cleaned her up we decided to see if the others were awake. Mel wrapped herself in a sheet and I slipped on some shorts. I never even thought to knock; after all it’s my house. I opened the door and the sight stopped me in my tracks and took my breath away. Dianne was naked on all fours bent over John her cunt exposed to both me and her sister. They were both naked and she was sucking on his large hairy cock. She stopped for a moment, looked back and saw it was me and Mel. “Morning” she said, and then she went back to sucking her brother in law’s cock totally unabashed that we were there. We sat on the bed and I watched her giving John a blow job like a cheap slut he’d picked up on a night out. Then as we watched her ejaculated in her pretty mouth and she swallowed every drop of his semen. “Did you have a good time babe?” John said to Mel. “Fantastic” she said with a smile at me. It was all a little awkward after that I mean it’s hard not to say “Did you enjoy fucking my wife last night?” and within an hour they were dressed and gone. Dianne and I spent the day in bed as I asked her to tell me what she’d done with John. “First you can tell me what you did to my little sister last night” she said. She made me tell her in detail what I’d done with and to Mel and all the time she had me finger her and the description of me fucking her sister had her cumming hard. Then she took my cock in her hand and as she wanked me she told me what John had done to her. “He’s not like you” she told me “You like to warm up and eat me he just wanted to fuck me, but that’s fine as I wanted to let him” She explained that once upstairs he’d lay her on the bed and he’d not asked, he’d just climbed on top of her and rubbed his thick cock against her pussy lips while he’d roughly kissed her and sucked on her nipples. After barely a minute he’d pushed his cock into her tight cunt and fucked her hard. He’d been rough with her and his cock had stretched her pussy. She delighted in teasing me about how his cock was so much bigger than mine. She told me how she’d enjoyed his aggressive, animalistic fucking and she told me how he’d made her cum over his dick when she’d allowed him to cum inside her pussy. She’d then let his hands and eyes explore her. He’d then taken his time stroking and fingering her hole. He’d sucked her nipples before ordering her to suck his cock. “I had to suck him for ages to get him stiff” she said “but I enjoyed it I loved having his big dick in my mouth” When she finally had him good and hard she had asked him to fuck her again. He’d happily obliged her and fucked her hard from behind, slapping her buttocks and even slipping his thumb into her arsehole, something I’d never done. “I came and came” she said “ as he called me a slut and thumbed my arse while he fucked me.” He’d filled her cunt again and as I rolled her over and started to fuck her I realised his spunk was probably still inside her cunt and maybe still on her lips. That pushed me over the edge and I filled her with my seed and kissed her lips hard.