When I get up, I find a very sheepish looking Katie sitting at the kitchen island. She has a rash of hickeys all around her neck and sits nursing a mug of coffee.

“Is he gone?” I ask. She nods and puts her hand to her neck, blushing in embarrassment.

“I’m sorry about last night.”

“I’m sorry too. Look, we really need to talk.”

What I’d hoped to talk about would have to wait as Heather chooses that moment to come out of the bedroom. She opens her arms and gives Katie a hug, all the time slagging her off about the Lothario she’d brought home and what Mum will say about the bruises on her neck. The two sisters talk away as I zone out, worrying about how the weekend will pan out.

Luckily my fears seem unfounded. The drive down is pleasant. It’s a lovely warm summer’s day and both girls have gone for sundresses and sandals. Heather is wearing her favourite sundress, a bright orange one with white daisies all over it. I always think she looks so good in orange with her dark hair. Katie has gone for a blue dress with white polka dots and I can’t help feeling like a kid in a candy shop as I look at the two of them.

Heather sits beside me but I decide to refrain from sliding my hand along her thigh as I’d normally do as I can feel Katie watching me from the back seat. Every so often I catch her eye in the rearview mirror and the knowledge that I’ll need to speak to Katie about what we are going to do causes a chill to run through me. Whatever happens at this party, I can’t let Katie tell Heather that we’ve been fucking for the whole week while she was away.

When we arrive, The girls’ mum, Ruth, comes out to greet us at the gate.

“Darlings,” she cries, hugging and kissing them both in turn. “Thank you so much for coming.”

She nods at me and gives me a smile and tells me she’s happy to see me too before she turns and leads the two girls into the garden where there is a small marquee set up.

I can hear the start of an argument with Katie pointing out that she didn’t want a marquee but I am more distracted by the sight of the three women as they walk off. Ruth looks like an older sister rather than a mother. She has the same build as both girls and all three of them are showing off great pairs of legs in their sundresses.

The party is a great success. Ruth is looking fabulous and despite claiming to all and sundry that she’s so old and looks terrible, I can see she’s having a ball. I’ve somehow got roped into being an unofficial barman and spend most of the next few hours pouring glasses of wine and opening bottles of beer.

The girls’ dad, David, wanders around chatting amiably to everyone and while it’s supposed to be just family and a few friends, I’m pretty sure there are at least sixty people in the garden.

David comes up and asks what I’d recommend. I laugh and he returns it with a sly grin. David knows so much about beer I joked with him several times that he’d be better off opening a brewery than staying on at the local tax office.

‘Maybe I should,” he shrugs when I make my perennial suggestion. “The girls are all grown up now. Maybe it is time to take a risk and try something different.”

He nods to himself a couple of times, almost as if he is having an internal monologue, then glances around the garden. I follow his gaze and notice Heather’s dog, Rex is desperately trying to hump a black labrador. I say Heather’s dog but when she moved to university, the dog stayed here and has become David and Ruth’s dog. He’s now over ten years old but still acts like a puppy.

“That dog’s a bloody pervert.” David laughs. “Acts like it’s the only gay dog in the village.”

“So who owns lover boy?”

I indicate the labrador who is now peeing on the corner of the marquee.

“Oh, that’s Ruth’s sister’s dog. Cecil. Bloody stupid name for a dog but there you go. Can’t remember if Cecil is Rex’s dad or his brother, but either way, they’re keeping it in the family.”

He chuckles a little and shakes his head.

“Anyway, have you seen Ruth anywhere?”

“No, not for a while.” I crane my neck and stand on tiptoe to scan the garden.

“I think she’s by the potting shed, talking to Katie.”

He nods his thanks and wanders off. I continue watching Katie. She is deep in conversation with her Mum and it looks to be serious. A few times, Ruth glances around, as if checking they are not being overheard. I see Heather making her way towards them and when Ruth spots her, she cuts Katie off and pats her hand then turns and heads straight for Heather.

I’m distracted by one of their aunts asking for a glass of white wine and when I look back, Heather, Katie and Ruth have all disappeared.

“Guess who?”

The hands cover my eyes and I freeze. I’m presuming it’s either Katie or Heather but if I guess wrong, there could be trouble. I concentrate. My nose can pick up a waft of perfume and I’m sure it’s not Heather’s. She has always worn Prada Candy ever since I bought it at a Duty-Free shop on a trip back from the States.

I take a breath, “Katie, you shouldn’t,” and reach up and grab her wrists. I turn to find her grinning at me.

“Why not? You’re virtually my brother-in-law. Am I not allowed to flirt with you anymore?”

She pauses and draws a circle on the ground with the toe of her sandal.

“Or would you prefer I did more than just flirt?”

She bites her bottom lip as she looks up at me. It’s a look of mischief.

“Not here.” I look left and right, checking the coast is clear.

“When then? I’ve missed you.”

She reaches and picks up an opened bottle of Sauvignon Blanc out of the wine cooler and pours herself a drink. She stares right into my eyes, swirling the pale straw coloured liquid around in the glass.

“Were you jealous last night? You needn’t be. He wasn’t very good. He wasn’t like you.”

“Katie, please. Can we talk about this later?”

“When later? Heather’s always there. When can I get you alone?”

“Hi, Mark. I’m so sorry you got landed as the barman.”

I turn. I don’t know if I blush or go white with fear. Heather is standing right there. I have absolutely no idea how much of the conversation she has heard. Katie gives her a big smile and says she’s going to go and look for Dad and heads off. We both watch her go, the hem of her sundress flaps as she skips across the lawn. I turn back to Heather, hoping she hadn’t heard.

“It’s ok. I don’t really know that many people so at least it gave me something to do.”

“You’re so sweet. I don’t deserve you.”

I cringe inwardly. If she only knew what I’d been up to for the past week with her little sister, I don't think she’d be quite so understanding. But then, all the stories Katie told me come flooding back into my head. All the lovers Heather’s had that she’s never told me about. Was that true or just one of Katie's stories? I suddenly feel like I don’t know either girl as well as I thought I did.

“I think I’ll make a start on the tidying up. People seem to be starting to head home now.”

Heather looks around and waves at an older couple who are heading towards the gate.

“The party’s not over yet, just some of the older ones leaving. I’m just going to say goodbye to my Auntie Julia. I’ll be back in a bit.”

She gives me a peck on the lips and heads off down the drive, calling back, “If you are going to tidy up though, you can stack the empty bottles in the utility room.”

I start clearing up, sorting the different coloured bottles into empty wine boxes. It’s been a boozy enough affair and I carry four boxes of empties into the utility room and stack them in the corner. As I walk back through the house, I notice a few more bottles strategically placed on the mantlepiece and on the bottom step of the stairs so I gather those up and make my way back to the utility room. I’ve just dumped them in an untidy pile on top of the washing machine when the door opens and Ruth comes in holding a glass of gin and tonic in one hand and an empty gin bottle in the other.

“Here’s another one for your collection.”

She places the empty bottle with the others on top of the washing machine.

“You’ve very sweet, Mark. Heather’s a very lucky girl to have you.”

She takes a swig of her drink and runs her eyes over me.

“You’re very like David, you know.”

I raise my eyebrows but don’t speak.

“Yes, he was into younger women too.”

I swallow. I’ve never really had a proper conversation with Ruth before. It’s just generally a quick hello before Heather monopolises any conversation. She has the same sparkle in her blue eyes as Katie but the same dark brown hair as Heather.

“Is David much older than you?”

“He was back then. Doesn’t really matter so much now. He was thirty and I was sixteen.”

She must see the look of surprise on my face as she giggles.

“Oh, don’t look so shocked. He didn’t know I was only sixteen. David was a Postdoc researcher at the local university. He thought I was a student. Me and my friend had got signed into the Students Union by a couple of boys we’d met in a pub. ”

She takes another swig of her gin.

“We’d used a condom but you know they are never 100% reliable. Anyway, he decided to stick by me, ever the gentleman. It took me a few years longer than I had expected to get my A levels and qualify as a teacher but I wouldn’t have changed anything for the world. I love both my girls.”

She takes a step closer and my eyes flicker between her face and her body. The cream sundress with the red flowers shows off her tan and her figure and I can see the merest hint of her nipples poking through the bodice.

“Sadly, being with an older man does have its disadvantages.” She holds up her finger and slowly curls it until it points down. “Viagra is a wonderful thing but it kills the spontaneity if you know what I mean.”

She steps closer. The distance between us has shrunk so we are standing almost face to face.

“You do know what I mean? Don’t you, Mark? When you get that urge and you can’t wait.”

I blush. Shocked at her frankness.

“Do you realise Mark, you’re closer in age to me than you are to Heather.” She smirks. “And you are certainly closer in age than to Katie.”

She laughs as my face gives me away.

“Oh yes, I know all about that. I know more than Heather does, that’s for sure. Though for how long the girls can keep secrets from each other, who knows?”

I try to take a half-step back but I’m pressed against the utility room worktop.

“You’ve been a very naughty boy, Mark.” She reaches for my belt and unbuckles it. “So let me see what all the fuss is about. What is it that you’ve got that makes both my daughters throw themselves at you?”

“Mrs Johnston… Ruth… please… what are you doing?”

My brain is in a whirl. What the fuck am I doing? Admittedly, there is a very attractive woman throwing herself at me and my penis decides to take charge. She has my cock out and is rubbing her fingers along the shaft. I’m already hard before she leans in and kisses me on the mouth. I taste gin on her lips.

“I’d have thought that was pretty obvious.”

She steps back and wriggles her dress up and pulls her knickers down. They fall to the tiled floor and she steps out of them with practised ease. She kisses me again as she takes my hand and guides it between her legs. I get a flashback of her daughter making the same move only a week before. My fingers cup her mound. My thumb traces her curls as my fingers slide along her lips and through her folds.

“I was such a good wife. He was only the second man I’d ever had sex with. He was the only man for such a long time. And all that time when the girls were growing up, he was fucking around, with his secretary no less. He’s such a fucking cliche. Well, now I’m making up for lost time.”

She puts her hand on the top of my head and pushes me down. She sits up onto the washing machine and opens her legs. As I kneel, I can see her sandals dangling from her toes. Her toenails are painted the same shade of red as the sandals, which match the red flowers on her dress and I can't help admiring her colour coordination before she grips my hair and tugs my face between her legs.

She has a full bush of luxurious dark curls which is quite a contrast to both daughters’ smooth-shaven mounds. I run my thumbs along her labia, opening her, releasing the piquant scent as I lean in closer and blow my breath over her clit.

I hear her moan appreciatively and feel her grip on my hair tighten. I stretch out the tip of my tongue and give her clit the merest flicker. Then, I greedily drag the flat of my tongue along her slit from perineum to clit, tasting her flavour as it explodes on my taste buds.

I slurp again and again, my tongue rasping over her, dipping into her folds and along her lips before pushing my tongue inside her as far as it can go. My nose presses onto her clit and I move my head up and down like a nodding dog as I swirl my tongue inside her.

I can taste the change in her flavour as she becomes more excited. Her juices become creamier and I can feel them smear on my chin as she squirms above me, little birdlike noises whimpering from her throat.

She tugs my face away from her and pulls my hair to signal me to stand up. We kiss again, tongues entwined, knowing she can taste herself on my lips. My fingers fumble, pushing jeans and boxer shorts down to my knees. She wraps her legs around my waist and pulls me in. My cock slides along her slit, the head rubbing on her clit before she reaches down and steers it inside her.

When I press my cock into her, I can feel her heat engulf me. Her wet velvet wraps around my cock and I hear her gasp as I bottom out inside her.

“That’s it, give it to me, you little bastard.”

She puts one hand behind her to steady herself while she paws at her tits through the dress with the other. She watches me as I begin to move my cock in and out. It’s a grubby, sleazy quickie. I look at Heather’s mum, Katie’s mum, their mum as I fuck her as well. She’s leaning back, legs spread, demanding I fuck her harder. The realisation that I’ve achieved the holy hat trick of fucking three women from the same family makes my cock swell with pride.

My hands grip her hips, pulling her into me with every thrust. There’s a slapping sound as my balls slap against her arse. Even after two kids, she’s still as tight as fuck and I start to move faster, giving it to her. I can feel my balls tighten and know I’m close.

As I fuck her, the relentless pounding has made the empty wine bottles bounce along the top of the washing machine. As I slam into her one last time and fire off spurt after spurt of hot white cum, the bottles fall and crash to the floor.

I can hear running outside and before I even have time to untangle myself from between Ruth’s legs, the door is flung open and both Heather and Katie are standing there. There’s a deathly silence as I pull my cock out of their mum and she tries to straighten her party dress.

“Um… I can explain.”