Cover of The Calculus of Love

The Calculus of Love

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Two AP teachers, the female one named Catherine Mordan, teaches AP calc Ab and AP calc Bc and honors algebra 2 , age 27, 5’7, plump since teaching for 7 years atp, and the male teacher named John Smith, a new guy, age 28, moved in from industry, teaches AP calc ab, AP calc BC, AP chem and AP physics 2, 6’5, 201 pounds of muscle , fall in love over time and John gains a lot of weight since teacher life and she cooks so much . They are the only two people in the calculus section of the math department

Chapter 2: Grading Papers at Midnight

The mountain of quizzes on Catherine’s kitchen table was a topographical map of adolescent struggle. Blue books fanned out between half-empty mugs of tea, their rims stained with tannins. A red pen had rolled into the butter dish.

Three weeks.

The phrase hummed in Catherine’s head as she pulled the casserole dish from the oven. Three weeks of shared planning periods that always ran over, of John leaning in her doorway, his massive frame blocking the fluorescents, asking, “But what if we approached the chain rule like it’s a secret code?” Three weeks of her leaving a container of lemon bars or pepperoni pasta bake on his desk, of finding the container washed and returned on hers the next day with a sticky note: ‘You’re a civilizing force. -J’

The scent of roasted garlic, cream, and Parmesan filled the small kitchen, wrestling with the drier, papery smell of the quizzes. John sat at the table, his brow furrowed in concentration. He’d swapped his henleys for a soft, navy polo that strained new across his shoulders and chest. It was subtle, but Catherine noticed. She noticed everything.

She noticed the way he’d started to sit with a slight sigh, the way his belt buckle seemed to be doing more heroic work than it had that first day. It wasn’t a softening of weakness. It was a settling. The lean, tensile muscle of a field engineer was being overlaid with something denser, a comfortable padding that came from long hours at a desk and the relentless, delicious siege of her home cooking.

“How’s the carnage?” she asked, setting the dish on a trivet.

John ran a hand through his short hair, leaving it slightly ruffled. “I have a student who insists the derivative of sin(x) is ‘cosmos(x)’. I don’t know if it’s a typo or a philosophical statement.”

“It’s week three,” Catherine said, pouring two glasses of a rich Cabernet. “It’s despair.” She handed him a glass and nudged a quiz with her elbow. “Move over. Share the burden.”

He slid the stack, his fingers brushing hers. A small, static spark jumped. They both pretended not to feel it.

For an hour, they worked in a rhythm punctuated only by the scratch of pens, the clink of silverware on ceramic, and soft groans of frustration or amusement. They ate directly from the dish, comfortable and wordless. Catherine pointed out a repeated error in implicit differentiation on a quiz from his period. He found a pattern of careless arithmetic mistakes in hers.

“Your ladder animation,” she said later, her voice loosened by the wine and the late hour. The quizzes were half-graded, the chaos more managed. “Did it work?”

John’s face lit up. “It did. But then Carlos Martinez asked if we could animate the guy falling off the ladder, too, maybe with a little ‘wah-wah-wah’ sound effect. So, there’s that.”

Catherine laughed, a real, unguarded sound. “See? Engaging.”

He smiled back, but it faded into something more thoughtful. He swirled the wine in his glass. “It’s harder than I thought. Not the math. The… everything else. The silence in the staff room. The way Henderson talks about the kids like they’re problems to be solved, not people to be taught.”

“Told you,” she said softly, not teasing now.

“I’m not sorry I came,” he said quickly, his eyes finding hers. The yellow pendant light caught the planes of his face, deepening the shadows. “It’s just… the loneliness is different here. In my old job, it was transactional. You’re alone in a hotel room in some grid-city, but you’re paid for it. Here, you’re surrounded by people all day, hundreds of them, and you can still feel completely… isolated.”

The word hung in the warm, fragrant air.

Catherine looked down at her hands, at a smudge of red ink on her knuckle. “Yeah,” she said, the word barely a breath. “I know that one.”

The hum of the refrigerator filled the silence. She took a fortifying sip of wine. “Haven’t been on a date in two years. Not a real one. You get tired of trying to explain to someone why you’re still thinking about a kid who bombed a quiz, or why you have to cancel because you’ve got ninety lab reports to grade. It’s not sexy, caring this much. It’s just exhausting.”

John didn’t offer platitudes. He just listened, his large form still and focused entirely on her. It was a better gift than any reassurance.

“Why did you really leave?” she asked, emboldened by the shared vulnerability and the deep purple wine. “You said you wanted to build minds. But a guy who drives a car like that… you loved the system. You loved the machine. What broke?”

He was quiet for so long she thought he wouldn’t answer. He finished his wine, set the glass down with precise finality.

“I was the machine,” he said, his voice low. “Efficient. Perfect. Solvable. And one morning, I looked at a schematic for a wastewater treatment plant component—something that would outlive me by a century—and I felt nothing. Absolutely fucking nothing. And I realized no one would notice if I felt nothing, as long as the outputs were correct.” He looked at her, his gaze raw. “I thought, if I’m going to be this lonely, I should at least be lonely in a room where it matters if I smile.”

Catherine’s throat tightened. She got up, ostensibly to get the bottle, but really to move, to break the magnetic field pulling her toward him. She refilled his glass, then hers. When she turned back, he was right there. He’d stood up, and the small kitchen shrank to the space between their bodies.

Her hip brushed the stack of quizzes. A few loose pages fluttered to the floor.

Neither looked down.

His hand was on the table, next to the abandoned red pen. Hers rested near it, fingers curled. The space between their skin measured in millimeters, charged and impossible.

“Catherine,” he said. Just her name. It wasn’t a question. It was a statement, solid and real as the table beneath them.

She saw the boyish enthusiasm he showed the students, but beneath it, she saw the man who had commanded complex systems, who demanded precision. She saw the hunger, not just for her food, but for the warmth she carried. It was all there, in his eyes.

She leaned in.

It wasn’t a graceful movie kiss. It was a collision of need, a direct solution to the equation of the past three weeks. Her mouth found his, and he tasted of wine and the dark chocolate she’d left on the counter. His lips were surprisingly soft, but the kiss wasn’t. It was deep, searching, an integration of all the glances and near-touches and shared silences.

A low sound rumbled in his chest. His hands came up, not hesitantly, but with the same sure intensity he brought to a whiteboard. They framed her face, his thumbs brushing her cheekbones, and she felt the sheer size of them, the warmth.

Then his grip shifted, sliding down to her hips. He pulled her firmly against him, and she gasped into his mouth. The solid wall of his body was different now—thicker, heavier, more substantial. The softness over muscle. It wasn’t a lean athlete holding her; it was a man. A man who had been consuming the care she offered and transforming it into something anchored and real.

He broke the kiss, breathing ragged, his forehead resting against hers. His eyes were dark, pupils swallowing the blue.

“Is this…” he started, his voice rough.

“Yes,” she cut in, her own voice unfamiliar to her. She tugged his bottom lip with her teeth, a quick, teasing nip that was pure promise. “This is definitely part of the system.”

A real smile, wild and relieved, broke across his face. He kissed her again, and in the movement, his elbow knocked the remaining stack of quizzes. They cascaded off the table in a fluttering, papery avalanche, spreading across the linoleum like fallen leaves.

He didn’t even glance at them. He just hoisted her up, her legs wrapping around his thickening waist as if they’d always known how, and carried her the few steps out of the kitchen, leaving the warm light, the cold pasta, and the ungraded work scattered behind them.

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