The Sum of Us
by TonyGW
Copyright© 2026 by TonyGW
David stood at the sink, not paying any attention to the grapes he was rinsing, but the sight to his right had his attention. Mia, well, Mia’s perfect heart-shaped arse in blue skintight workout shorts was his focus. Her arse swayed slowly from side to side with almost feline grace, moving to a beat only she could hear. She was pouring wine at the breakfast counter in their kitchen, dancing to whatever was playing through the Air Pods hidden by the mane of blonde hair that was also moving in counterpoint to her arse. Such a normal Friday night thing was so erotic David felt himself hardening; then again, everything Mia did was erotic ... and unplanned. That was just Mia: tall, toned and perfect. She radiated grace and sexuality; completely unselfconscious, she seemed oblivious to the effect she had on those around her. As he watched her, an unbidden thought, a nagging feeling rose to the surface; again, something was off. Nothing he could point to or say that was wrong; it was just a feeling. A door opened and voices snapped him back to the now.
It was exactly 6:30 PM and the laughter entered before anyone even opened the door. David, still in his hospital scrubs, wiped his hands on a towel and smiled toward the sound, towards their friends. Michael, in his usual Polo and jeans, strolled in holding a bottle of red, and Kathy, casual in shorts and a blouse, perfect attire for the warm Queensland evening, was in the kitchen before anyone even said hello and greeted Mia with a hug that showed their depth of friendship, a hug that didn’t need words.
This was their routine, their tradition.
The four of them ... David and Mia, Michael and Kathy ... were more than friends. They were a unit. A little tribe with its own language of glances, inside jokes, and second-hand stories that had morphed over time into shared history.
David and Michael had known each other since year three, where they’d bonded over a shared hatred of their year 3 teacher, the evil Mrs Parsons, and a love of dinosaurs. From backyard battles with Star Wars figures to high school study sessions, they’d grown up, side by side. They had fought like brothers and loved like them, too. Mia and Kathy had met in their first year of high school, thrown together by alphabetical seating. It took two weeks and one disastrous group project before they were inseparable.
The four met and merged at UQ, the University of Queensland in Brisbane. Strangely, it was David and Kathy that clicked first. David was headed for medicine and Kathy for law. The undergrad degrees they had chosen shared many of the same classes and lectures in their first year. The irony was that the same alphabetical seating and shared projects that had bonded Kathy and Mia worked to bond Kathy and David. They had tried out the standard 18-year-old girl meets boy thing but found they were much better friends than lovers. Over the next year, their friendship deepened to the point where they would finish each other’s sentences, much to the annoyance of everyone around them.
Michael had taken a gap year, and his parents had paid for him to travel and spend the year backpacking around Europe. He also spent a great deal of time enjoying the delights of the American and British girls that were doing the same and swooned to his good looks and Aussie accent. On his return home, he joined his best friend at UQ to study business and was quickly included into the David-Kathy clique. The two were now three and the dynamic changed. Kathy was smitten the moment she met the larger-than-life Michael; his stories of Europe captivated her, and his self-confident smouldering sexuality aroused her. Michael was completely besotted by the pretty brunette from the Gold Coast. She was opinionated and fearless. He was charming and calculating with a mind for numbers and an eye for detail. They were magnetic from day one.
Mia was studying political science at ANU in Canberra and, by the end of her first year, decided that everyone studying political science was a dick. She hated the subject and the stuffy atmosphere of entitlement that seemed to be the ANU personality. She came back to the Gold Coast deciding to just chill on the beach and see what came along but her father quickly put an end to that idea. Deciding to join her best friend in Brisbane, she transferred her ANU credits to UQ and enrolled as a marketing major. To say the statuesque blonde’s arrival on campus was noticed would be a gross understatement. Mia was an enigma; she looked like a supermodel but acted like the girl next door. She drew guys like moths to a flame but sadly for them she was fixated on David. The three had become four. Kathy’s friend had captured Mia’s heart from their first meeting. She could not tear herself away from the tall, toned, sandy haired guy. He was the quiet, focused med student with the dry wit and she was the outgoing, driven marketing major who was always the centre of attention, not that she noticed. They balanced each other. He grounded her. She sparked him into life.
It didn’t take long for the four to blend. Double dates and studying together turned into weekend trips to the coast, then holidays together. A year later, the four of them shared a house they rented near the campus. Within four years, both couples were married. David and Mia first, with a wedding by the bay near his father’s home at Victoria Point. Michael and Kathy followed that the next year with a beach ceremony in Bali that ended in drunken dancing and making love in the surf.
Now, five years into marriage, they lived only a five-minute drive apart, in a quiet suburb that allowed for spontaneous drop-ins, barbecue Sundays, and Friday wine nights that bled into brunch on Saturday.
David was deep into his work as a Resident Medical Officer in A&E at the Royal Brisbane Hospital, often working long past the scheduled 12 hours dealing with accident and emergency patients that seemed to come in a never-ending stream. He was also pursuing certification as a trauma specialist ... a gruelling commitment that had him buried in case files and online courses most nights. He carried it well, but Mia saw the tired lines around his eyes, the way he sometimes paused for too long before answering questions.
Mia’s role as the Marketing Coordinator for a major department store chain took her away often: monthly travel to flagship stores across the country, endless presentations and reports. But she loved it ... the hustle, the energy. She thrived under pressure. Her phone rang constantly, but she knew when to put it away. When she was home, she was home, in her safe harbour, with David.
Michael, ever the numbers guy, worked for a boutique retail investment house, juggling client portfolios and riding the adrenaline of the market. His confidence in risk made him excellent at his job. He was stable, though sometimes overly obsessive, he was also well on his way to making them all rich.
Kathy, when not speaking her mind, was the heart of the group. Having changed from law, the mercenary nature of her chosen field of study having offended her to her core, she now taught primary school after graduating with a degree in education. Her classroom was her kingdom, and she loved the chaos of it. She brought the softness and warmth. She always had tissues in her purse. Still outspoken, she had a way of swaying your opinion with a string of facts or disarming you with a single sentence.
Tonight, they were all here. Chili con carne was in the slow cooker, a Claire Valley Red in their glasses, and the Brisbane skyline starting to glitter in the early evening over the sea of purple Jacarandas beyond the veranda.
“Okay,” Michael said, raising his glass. “To end-of-week decompression and bloody good South Australian shiraz.
“Cheers,” Mia said, clinking glasses.
“To friendships that outlast our liver function and our mortgages,” David added, his smile tired but genuine.
“To a family,” Kathy said softly. Her words lingering longer than the others.
It wasn’t a planned conversation. Rather, it was the kind that surfaces out of a comfortable evening, born from friendship and wine. They were all sprawled in the lounge room, half in comfort, half in quiet restlessness. Kathy sat on the carpet with her legs folded beneath her on a cushion, fingers absently tracing the rim of her wine glass. Michael and Mia shared the couch, Mia tucked under his arm, feet curled beneath her. David sat perched on the armrest as he often did, nursing a glass of shiraz, his other hand resting lightly on Mia’s thigh.
“I was talking to one of the younger teachers at work today,” Kathy said, her voice soft but bright. “She’s pregnant with her second. Due in November. She looked so tired ... but so excited. And it just ... it made me think.”
Michael shifted beside Mia, curious. “Thinking about what?”
Kathy hesitated, then smiled. “About babies ... about us ... about timing.”
Mia turned slightly toward her, brow arching. David stopped mid-sip and lowered his glass slowly.
“About us? ... You mean ... us starting a family?” Michael asked.
Kathy nodded. “Yeah. I mean, look at us. We’re stable. Married. Good jobs. We’ve built this beautiful life. Isn’t now the moment before we blink and realize another five years have gone?”
There was a moment of silence, then Michael grinned. “So, you want to start trying?”
“Not tomorrow,” Kathy said, laughing. “But ... maybe soon. I wanted to bring it up with you guys, too. Because we’re not just couples, we’re this weird, amazing four-piece band. And a baby ... any baby ... changes the music ... for all of us.”
David exhaled slowly. “She’s right. It wouldn’t be just a personal change; it’d be a change to our whole dynamic. But that’s not a bad thing; it’s just a natural expansion of us, it’s structural.”
“It’s seismic,” Mia said, her voice softer than she intended. “Right now, we’re fluid. Spontaneous. Late dinners, weekends away. Random beach trips. That changes when there are four hourly feedings, nap schedules and car seats.”
Kathy looked at her, wide-eyed. “But don’t you ever imagine it, Mia? A little version of you and David? Watching him hold a baby? It’s ... I don’t know. It’s a kind of magic I can’t stop thinking about.”
“I do,” Mia said after a pause. “I’ve imagined it a lot. But ... I’ve also imagined losing myself. Waking up one day and not knowing who I am anymore. Just being ‘Mom’ and nothing else.”
David reached over, taking Mia’s hand. “We wouldn’t lose anything. We’ll just expand ... evolve. It would be different, but we would make it work.”
Mia swallowed. Kathy caught her eyes and gave her a quiet smile.
That night, in bed, the room was quiet. David lay behind Mia, tracing lazy circles on her arm.
“You’ve been quiet,” he said.
She turned, facing him in the half-dark. “Just thinking.”
“You don’t have to pretend for me. If you’re not ready ... if you’re scared...”
“I’m not pretending,” she whispered. “I just ... I want to want it ... some days I do. Some days, I ache for it. But other days, I look at my life ... our life ... and I don’t want to let go of it.”
David nodded slowly. “You’re not alone in that.”
“I love our friends,” she said. “I love us. I love waking up in this bed, knowing we can just ... be. We can chase work, chase each other, chase a daydream. I won’t know who I am if ... if it changes.”
“You’ll still be you,” David said gently. “Even if you’re a mum. You’ll still be that stubborn, curious, beautiful mess I married.”
“I don’t want to lose us,” she said, voice cracking. “Not just you and me. All of it. Our rhythms. The way we live.”
“We won’t,” he promised. “If we do this, we do it on our terms. We don’t become anyone else. We find a new version of this life that still has laughter and wine and sex and time with our friends.”
She smiled faintly. “Even with timed feedings and nappies?”
“Even with timed feedings and nappies” he said.
She leaned into his chest. “Okay. We don’t have to decide anything tonight. But ... let’s talk more. I want to do this ... the right way not just because everyone else is doing it.”
He kissed her hair. “That’s all I need.”
Five kilometres away, Michael and Kathy were tucked under a heavy blanket in their own bed, the soft sound of a playlist humming in the background.
“You caught me off guard tonight ... left me a little gobsmacked,” Michael admitted, resting his chin on her shoulder.
“Yeah?” Kathy said softly.
“I had no idea ... I mean ... I didn’t know you were already thinking about babies.”
She turned to look at him. “I’ve been thinking about it for a while. Quietly. I didn’t want to scare you off.”
He chuckled. “Scare me off? Kathy, I’ve had mental pictures of a tiny copy of you, with your grace and my attitude since ... well since Uni.”
She laughed, but it didn’t reach her eyes.
“What’s wrong?” he asked.
“I want it, some days it’s all I can think about ... I just ... I guess I’m conflicted. I want this so badly my whole-body screams at me that I’m ready.”
“But,” Michael interjected.
Kathy smiled warmly at him, “But” she said, “I don’t want to become someone I don’t recognize. I’ve watched friends disappear into parenthood. They stop traveling. Stop dreaming. They just exist.”
Michael pulled her closer. “That won’t be us.”
“How can you be so sure?”
“Because we know what we want,” he said. “And we’re good at keeping each other honest. If we start to drift, we call it out. We fix it.”
She searched his face. “And what if we can’t?”
“Then we fall forward,” he said. “Into whatever comes next.”
She exhaled slowly. “I want to try. I really do but I need to know we’re not giving up the version of us that we love so much.”
“We’re not giving it up,” he whispered. “Just like David said, we’re just expanding the definition.”
Kathy lay her head on his chest. “Okay. Then let’s dream about it a little longer.”
A week later, the girls met at their favourite wine bar ... a dimly lit nook tucked into a quiet corner of the Westend ... all dark wood, candlelight, and low murmurs. It was their spot. A place where secrets had been spilled and dreams stitched together over countless glasses of merlot.
Mia leaned back into the buttery leather of their usual booth, swirling the dark red liquid in her glass before taking a slow sip. Her eyes lingered on Kathy, who was quiet ... too quiet. She wasn’t the type to hold her tongue.
“So,” Mia said, breaking the silence, “how are you feeling about everything? The whole ... maybe-babies, maybe-life-change thing?”
Kathy’s fingers traced the rim of her wine glass. “Excited, I think. But nervous, too. It still doesn’t feel real. Like, we said it out loud, but it hasn’t sunk in yet.”
Mia nodded, her voice softer. “Same here. It’s like ... once we take that step, we can’t un-take it. And part of me wonders if we’re about to lose something. Something really rare.”
Kathy looked up, her expression thoughtful. “That’s what I keep thinking about, too. This thing we have ... the four of us ... it’s not normal. It’s deeper than most friendships. And if we go down the parenthood road ... I don’t know. I don’t want to just drift apart like everyone else.”
Mia tilted her head. “So, what are you saying? ... We freeze time somehow?”
Kathy glanced around, then leaned in, lowering her voice just above a whisper. “No ... I’ve been thinking of something else. A way to mark the shift. Not freeze time ... more like ... honour it ... give us all something special to mark the change. Something that would be an extension of us, where we are now.”
Mia narrowed her eyes, curious. “Honour it ... how?”
Kathy’s lips parted, and for a moment she seemed to hesitate. Then she took a quick sip of wine for courage and said, “What if we planned something? One last weekend ... just us. The four of us. No distractions. No responsibilities. And ... we do something that will bond the four of us forever ... we swap.”
Mia blinked. Expressionless like her brain needed a moment to catch up. “Wait ... swap?”
Kathy nodded slowly. “Yes. Like, you and Michael. Me and David. Just once. No strings. No secrets. We’d all know. It would be about trust, about letting go of this chapter before starting the next. We’ve shared everything else four people could share; this would take us to a new level ... bond us. We’ve come close before, remember. On the deck at the beach house in Byron Bay. Shit we were practically doing it on top of each other.”
Mia set her glass down, fingers tightening around the stem. “You’re not joking are you ... you’re serious?” Mia’s words betrayed her thoughts. God, yes, she remembered Byron Bay ... David ploughing into her while she watched Michael take Kathy ... while she watched Michael ... Michael...
“I’ve thought about it a lot,” Kathy said gently. “We’re bonded so deeply already ... this wouldn’t be some tawdry fling. It would be ... symbolic ... a shared ritual. It would be like a sendoff for who we’ve been, the beginning of a new us.”
Mia stared at her, her mind reeling, images flashing before her eyes ... Michael laughing in the kitchen, Michael shirtless by the pool, Michael’s eyes always lingering just a fraction too long, her eyes doing the same, that day in Byron ... his lips...
And now, the suggestion dangling between them ... She could get him out of her thoughts, into her bed.
She swallowed. “I mean ... that’s a hell of an idea, Kath.”
Kathy smiled faintly. “You’re not offended?”
“No, just...” Mia ran her hand through her hair. “Surprised. Honestly, I never expected you to bring something like this up.”
“To be honest, I’ve had the whole swap thing haunting me for a while ... well since Byron, I’ve seen the way Michael looks at you sometimes when he thinks I’m not watching ... and David, fuck, you are such a lucky bitch, David is just ... gorgeous,” Kathy admitted. “Then that holiday in Byron Bay, those three weeks, the sexual tension was ... you felt it, too, I know you did. So, yeh, swap, I wanted to see what you thought.”
Mia exhaled, slowly. Willing her hands not to shake. Her mind spinning. This thing Kathy was suggesting ... just support it ... don’t sound too enthusiastic. Giving voice to her real thoughts, would bring it all down, destroy everything. Michael...
“If we’re being honest, then, I must admit that I’ve had the occasional wet panty thought about Michael, too. But ... well, you know David. He’s ... steady. He’s deep-feeling. He doesn’t do casual when it comes to intimacy. He’s built from old-school loyalty. You remember how bad he took it when his mom left. That train wreck almost destroyed his trust ... in people ... especially in love.”
“I know,” Kathy said gently. “And I’d never want to hurt him. I just ... I feel like maybe this could be healing if it’s done with good intention, with care.”
“And Michael?” Mia asked, voice carefully neutral.
Kathy nodded. “He’d be all over it. He said he’s always thought you were ... how did he put it? ... one serious piece of ass.”
Mia flushed, instantly, colour rushing to her cheeks. “He said that?”
“More than once. Seriously, he’d be on you in a heartbeat if he thought it’d be okay.”
Mia bit her lip, trying not to smile. But she was smiling. Just a little.
“He’s ... intense,” she said softly. “There’s something about him. That kind of charm that gets under your skin. But I wouldn’t ... Not really.”
Kathy gave her a knowing look. “You sure?”
Mia hesitated. That was the problem. She wasn’t sure. Not anymore.
“I don’t know what to say,” she murmured.
“Just think about it,” Kathy said. “We don’t have to do anything but if we’re all heading into a new phase of life ... maybe this is our way of making peace with the end of an era ... creating a new bond ... a different bond ... between us. We’ll be stronger as a result.”
The atmosphere around them shifted ... thicker, charged.
Mia lifted her glass again and took a long, slow drink.
“I’ll think about it,” she said at last.
But the truth was ... she was already thinking about it. Not in the abstract, not as a philosophical idea, but in vivid, intimate detail and it terrified her how intrigued she was.
The room was still, quiet save for the low hum of the air conditioning and the soft murmur of breath between the tangled sheets. Moonlight spilled through the blinds, striping the bed in silvery lines. David lay next to her, his hand draped loosely over Mia’s hip, fingers tracing idle circles. Their skin was still slick with sweat, their bodies relaxed from the slow, aching intensity of the lovemaking they’d just shared.
It had been good ... better than good. It had been deep, connected, the kind of lovemaking that left echoes. But for Mia, that very depth only intensified the dissonance echoing in her chest. During at least one of the orgasms that she had shuddered through she had been thinking of a deck at a beach house 1000 kilometres away ... Michael ... his muscles rippling along his back ... his toned arse clenching as he drove into Kathy sending her over the edge into bliss so easily.
She turned toward Michael slowly, her fingers brushing along the hard line of his jaw. “You’re incredible,” she whispered, trying to make the words feel more real than the ache behind them.
David smiled, warm and sleepy. “You always say that.”
“Because it’s always true,” she replied. Her voice caught slightly. “But tonight ... it felt different. Like we were trying to speak through touch instead of words. Like ... we were sharing something ... special ... unique.”
He leaned in, kissed her bare shoulder. “You were somewhere else there at the end,” he said quietly, “where did you go?”
“Babies, changes ... stuff,” she said biting her lip hard when she realised that for the first time in their long relationship she had lied to him.
“OK” he murmured and slipped out of bed.
She listened to his retreating footsteps, heard the fridge door creak open, the clink of bottles. Her eyes fixed on the ceiling, unmoving. Guilt twisted in her stomach like a blade slowly turning.
Why was she thinking about Michael ... and why couldn’t she stop?
Why, after a night like this ... with David loving her with such reverence ... was her mind still full of a man who wasn’t her husband?
She’d tried. God, she’d tried to shut it down, to pretend the tension between her and Michael was just imagination, a harmless crush. But it wasn’t harmless anymore. Not when his voice lingered in her mind. Not when she remembered the way his eyes flicked to her lips when she spoke, the heat of his gaze when they laughed too long, too close.
David returned and handed her a bottle of water. She took it, whispered, “Thanks,” but didn’t drink. She felt his gaze on her ... searching, patient.
He settled against the headboard beside her, his shoulder brushing hers. “Alright,” he said gently, “what’s going on in that head of yours?”
Mia blinked, startled by his accuracy. “Nothing. I’m just ... tired.”
David’s voice softened. “You’re here, but you’re not. Talk to me.”
Her heart squeezed. He deserved the truth. At least part of it.
“I found out something about someone I work with,” she began slowly the lies easier now. “She and her husband ... they’re swingers.”
David’s eyebrows lifted slightly, but he said nothing. Just listened.
“I couldn’t stop thinking about it,” she continued, her voice low, confessional. “Not because I want to do it. Not exactly. It just ... shook something loose in me. Made me wonder if there’s more to love than I thought. If we ever really know everything about each other.”
She glanced at him. He was unreadable. Calm but guarded.
“Are you asking me to open our marriage to share you?” he asked evenly.
“No!” she said quickly, sitting up. “No, I swear. This isn’t a setup. I’m not trying to change anything.” ... more lies...
“Then what are you trying to say, Mia?”
She opened her mouth ... then hesitated. How could she explain that Michael had taken root in her thoughts ... in her heart? That when she was alone, her hand between her legs, it wasn’t always David’s name on her lips in the dark. That sometimes, in her dreams ... that tonight it was Michael’s hands on her hips, Michael’s breath in her ear.
She couldn’t without shattering him and he didn’t deserve that.
“I just felt guilty,” she said instead. “Guilty for even thinking about it. Guilty for hiding that I was thinking about it. I don’t want to hide things from you.”
David was quiet. The silence stretched, taut and heavy.
“You know where I stand on cheating,” he said at last. “That would be the end of us.”
“I know,” she whispered. “It would be the end of me, too. I’m not looking for that. But the way she explained it, they were in it together, willingly, trying to try something new together ... no secrets.”
“But you’re ... curious?”
Mia nodded slowly, painfully. “Curious about the idea. Not the act. Not the reality. Just ... what it would feel like to be with someone else. To ... explore that side of myself.”
His jaw tightened, just slightly. “Is this about anyone specific?”
She froze. The truth wanted to leap from her mouth, to protect her. But something else ... shame ... maybe love ... held it back ... instead another lie.
“No,” she said quietly, not quite lying, but not confessing either. “It’s just something I had never thought about. It seems so out there, so now, so liberating ... I let my imagination run wild ... a fantasy.”
David exhaled, long and slow. “I get it. Sort of. Swinging isn’t cheating if everyone consents. But even then ... the idea of someone else touching you makes me feel sick. I don’t think I could, Babe, no matter how out there or liberating, when we returned home, things would be different, at least for me. You with someone else, like that...”
Mia closed her eyes. She hated herself for how those words made her feel. She wanted him to be possessive. She wanted him to fight for her. But she also hated that his love ... so pure, so unwavering ... only made her feel more broken.
He wrapped his arm around her, pulled her gently into him. She rested her cheek against his chest, listening to the strong, steady beat of the heart she was slowly breaking.
“If we ever did something like that,” David said, “it wouldn’t be random. Not strangers. It would have to be people we trust. Kathy. Michael.”
Her breath caught.
He felt it.
“What?” he asked, brows furrowed.
She forced her voice to be calm. “Nothing. Just ... surprised you’d say that.”
David kissed the top of her head. “I’m not saying I want it. Just ... as a thought experiment ... if we were ever going to explore something, it would have to mean something. It would have to be someone we had feelings for ... someone we know and trust ... close ... safe...”
She nodded, but her thoughts were racing. David didn’t know how unsafe that would be. How close she already was to the edge.
She loved David. Fiercely ... she believed ... but in a part of her soul, part she didn’t want to name, she wanted Michael. Had for a long time. Wanted the way he looked at her. Wanted to know how it would feel to give in to that desire.
And she hated herself for it.
“I’m glad we can talk like this,” she said, the words sounding thin and distant.
“Me, too.”
They lay together in silence again. But this time, for Mia, it wasn’t the silence of trust. It was the silence of a woman standing at the edge of a line she swore she’d never cross ... wondering if she already had.
The café was nestled on a quiet street in Toowong, a leafy suburb on the banks of the Brisbane River, surrounded by park land and bike trails. The office buildings and apartments towards the river, beautifully designed, blended into the lush surrounds. Inside, it was all exposed brick and woodgrain, the air thick with the scent of roasted beans and warm bread. Mia slid into her usual seat at a table in the back, near the window, the one with just enough shadow to feel private but enough sunlight to feel honest. She stirred her chai latte slowly; watching steam rise and vanish like thoughts she couldn’t quite hold onto.
Her fingers trembled slightly, though she’d never admit it.
Ten days. It had only been ten days since that conversation with David, since she’d cracked open the door to a darker, stranger curiosity, one she’d barely admitted to herself, one that had a name.
Michael.
She hated how often she thought about him now. How vivid the memories had become. His laugh. The way he leaned when he listened. His smell ... woodsy, peppery. How that one time he’d touched the small of her back to let her pass at a barbecue had sent a shiver up her spine like static. His lips in that moment out of time at Byron Bay ... it wasn’t normal. It wasn’t right. But it felt ... electric.
And now here she was, staring at the steam like it held answers.
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