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The heat that week wasn't ordinary heat. In September, the city should have gently surrendered to autumn, allowing the air to become thinner, crisper, cleaner. Instead, an African anticyclone had settled over the plain like a stubborn architect refusing to alter his plan, and humidity had seeped into everything: between the fibers of clothes, under the skin, in the stairwells, in the walls of apartments that seemed to expand and contract with every breath.

Luca could feel it in his hands as he drew. The tracing paper, usually smooth and dry, had become sticky, and the Rapidograph was gliding at an inconsistent pace, leaving marks that he perceived as flaws, as betrayals. That evening, leaving the university, he had forgone the stifling subway and walked for three-quarters of an hour under a sky that refused to darken, a copper-and-purple sky, heavy with a storm that refused to break out.

Sweat was dripping down his back, invisible under the light linen shirt he'd worn that morning, thinking of the air conditioning in the assembly hall. Now the shirt was a second layer of skin, heavy, intimate, embarrassing. He could smell his own scent, not unpleasant, but human, all too human, and he longed for only one thing: the cold shower in 3A, the water cascading against his temples, the silence of his own space.

The building's front door opened with its usual creak, and Luca entered the foyer like a castaway arriving on an island. The marble floor was cool, a sudden relief under his feet. But the elevator, that metal and wood box dating back to 1962, awaited him at the end of the entrance corridor, its orange light filtering through the cracks in the cabin, flickering, sickly.

He pressed the button. He heard the motor respond from below, a distant, almost animalistic hum. It was then that he heard footsteps behind him. They weren't the heavy steps of the woman on the first floor, nor the nervous jolt of the boy on the fourth floor who worked at the bank. They were slow, deliberate steps, measuring the marble with the precision of someone who knows he's being watched even before he sees them. Luca didn't turn around. A tension tightened between his shoulder blades, a thread of electricity running down his spine and nestling in his stomach.

The footsteps stopped beside him.

"It's hot, huh?"

The voice. That voice.

Luca turned around. And the world shrank.

Ethan was there, his physical presence seemingly defying the geometry of the space. He wore a denim jacket, light, open, unbuttoned, and nothing underneath. His torso was bare, exposed, sculpted by the dim light of the corridor as if someone had designed that lighting specifically for him. His skin was shiny with sweat, a veil that made it almost metallic, emphasizing every slope, every prominence, every shadow that crept between the muscles of his abdomen. A small trickle of sweat ran down his chest, along his sternum, and disappeared under the waistband of his dark cargo pants.

Luca felt his mouth go dry. It wasn't just the beauty—that was obvious, raw, almost unfair—but something more disturbing. It was the casual way Ethan displayed that body, as if it were the most natural thing in the world to present himself like that, a foot away from a neighbor, in a condominium lobby. There was no embarrassment, no defense. There was only total, absolute awareness of his own impact.

"Too hot," Ethan added, and his hand, that hand with the broad knuckles and long fingers, rose to touch the hem of his jacket, opening it even further, inviting Luca's gaze to descend, to explore, to lose himself. "I couldn't hold my shirt anymore. It was stuck to my skin."

Luca nodded. His architect's brain struggled to classify, measure, maintain control. Tight space, he thought. Two bodies in a volume of two cubic meters. Increasing density. Ambient temperature incompatible with normal thermoregulation. But the technical thoughts dissolved like tracing paper in the rain when Ethan looked at him. Those green eyes, even in the dim light, had a luminescence that wasn't physical. It was chemical.

The elevator arrived. The grilled doors opened with the usual metallic thud, and Luca entered first, almost as if fleeing, almost trapped. He leaned against the back wall, the one with the fogged and scratched mirror, and watched Ethan enter behind him.

The cabin was tiny. Designed for three people, perhaps four if cramped. With Ethan inside, it seemed like a monolith, a sealed chamber where air no longer circulated. The smell of Ethan's sweat—salty, intense, mixed with something woody Luca couldn't identify—filled the space instantly, replacing the oxygen. Luca felt his heart pounding in his temples.

Ethan pressed the button for the third floor. The doors closed. And the outside world disappeared.

The elevator lighting was a neon bulb set into the ceiling, protected by a yellowed plastic grille, which emitted an intermittent, almost breathing light. It would turn on, go off for a tenth of a second, then turn on again. And in those flashes of darkness, Luca felt Ethan's presence amplify, as if the brief darkness gave it greater weight.

"Did you spend the day drawing?" Ethan asked. His voice filled the cabin without needing to raise its tone. It resonated against the metal walls, against the mirror, against Luca's skin.

"Yes. A project." Luca's voice came out lower than expected.

"You like to observe things, don't you?"

The sentence wasn't a question. Or maybe it was, but the kind that didn't allow for simple answers. Ethan had moved. Not much, a step, maybe less, but enough to reduce the distance between them to something less than an arm's length. Luca felt the heat radiating from the other's body, a different, denser heat, that had nothing to do with the temperature outside. Ethan's sweat gave off a scent that made him dizzy.

"What do you mean?" Luca asked, and he too felt the weakness in his own voice.

Ethan smiled. That slow, asymmetrical smile, starting from one corner of his mouth and seemingly fading before reaching the other. His lips, fuller than usual, with a natural color that seemed slightly red, parted slightly.

"Observe. Study. Measure." Ethan paused. The fluorescent light flickered, and for a moment his face was all shadows and contrasts. "You looked at me, Luca. In the foyer. On the stairs. From your window."

Luca felt the blood rush to his face. A violent, burning blush betrayed him. He opened his mouth to deny, to apologize, to invent any excuse, but Ethan continued, lower, almost a whisper that needed no volume to be heard.

"You like to observe, don't you? To see without being seen. To look from beyond borders."

Another step. Ethan was so close now that Luca could see the individual beads of sweat on his neck, could count the lashes framing those green eyes, could feel the rise and fall of his chest with a deep, controlled breath that betrayed no tension. And yet, beneath that calm, Luca felt something tense, ready to snap, like a bow drawn to its limit.

"It's not…" Luca began, but the sentence died away.

"It's not what?" Ethan leaned down slightly, bringing his mouth close to Luca's ear. The warmth of his breath caressed his earlobe, his cheek, a trail that seemed to leave invisible imprints. "Isn't it? Or is it not allowed?"

The elevator seemed to have stopped rising. Or perhaps it was rising so slowly that time had dilated, each second stretched out like a falling drop of honey. Luca was glued to the metal wall, cold against his back, a violent contrast to the fire he could feel before him. He couldn't take his eyes off Ethan's lips. He watched them move as he spoke, watched them close, open, allowing a glimpse of the tip of his tongue. They were lips made to be looked at, yes, but also—and the thought shot through him like an electric shock—for something else. To touch. To be touched.

"Boundaries," Luca murmured, almost unconsciously, "are meant to be respected."

Ethan laughed. A low, vibrating sound that Luca felt physically in his chest. "You're an architect, Luca. You should know that boundaries are just lines on paper. In reality, walls have thickness. And within thickness... there's always an interstice. A space where neither side has control. A neutral space."

Ethan's hand moved. Slowly, with a slowness that seemed designed to be observed, to be registered by every fiber of Luca's nervous system. It didn't move toward his face, not toward his chest. It descended, floating in the dense air of the elevator, and reached Luca's wrist.

The touch was minimal. A finger, just the index finger, brushing the inside of his wrist, where the blue veins ran close to the surface, where the pulse was a drum beneath the skin. A contact that lasted less than a second, perhaps less than half a second. But it was enough to leave an imprint that Luca felt burning like a seal.

"A neutral space," Ethan repeated, and his finger traced a short, almost imperceptible line along his wrist before retreating.

It was at that precise moment that the elevator stopped.

The mechanical thud was like a slap. The grilled doors swung open with their familiar creak, and the light from the third-floor corridor, that sickly yellow light, flooded the cabin. Luca blinked, disoriented, as if torn from a daydream.

Ethan moved. He exited the elevator with a fluid step, without looking back, as if nothing had happened. But at the threshold of the door, he stopped. He turned. And that smile, the one Luca was learning to fear and desire with equal intensity, lit up his face.

"Good night, neighbor from 3A," he said. "Dream of me."

And she disappeared down the corridor, towards 3B, leaving Luca alone in the open cabin, his pulse still throbbing from that phantom touch, his cheeks burning, his breathing not returning to normal.

The elevator doors began to close. Luca rushed out, almost stumbling, and reached the door to 3A with shaking hands. The key turned in the lock with difficulty. He entered. He closed it. He leaned against the wood, in the darkness of his apartment, and closed his eyes.

The pulse. He could still feel the pulse. That finger that had traced an invisible yet unforgettable line. A boundary, Ethan had said. A gap. And in that space between, in that thick wall separating 3A from 3B, in that fraction of a second when a finger had grazed a vein, something had changed.

Luca looked at his wrist in the darkness. The skin was smooth, intact. Yet he felt the mark, like a cold burn. He went to the bathroom, turned on the faucet, and let the cold water run over his wrist. It didn't help. The memory was more powerful than the water.

That night, he didn't turn on the living room light. He sat on the sofa bed, still dressed, his wrist resting on his knee, and stared at the wall that overlooked 3B. On the other side, he could hear Ethan's usual sounds. Footsteps. The shower, a long one this time, as if he, too, needed to wash away more than just sweat. Then silence.

Luca lay down. He closed his eyes.

And he fell asleep as one falls into an abyss.

The dream had no linear plot. It was made of sensations, fragments, an architecture of desire that didn't follow the laws of physics. He was in the elevator again, but the cabin was larger, or perhaps smaller, the dimensions changed, the walls moved closer and further away as if breathing. Ethan was there, but he wasn't wearing his jacket. He wasn't wearing anything. Sweat coated his skin like a liquid film, and the neon light no longer flickered; it was steady, blinding, white.

"Watch," Ethan said, but his voice didn't come out of his mouth. It came from all the walls.

And Luca watched. He watched Ethan's hands rise, watched the fingers reach out toward him. And this time the touch wasn't a finger on his wrist. It was a whole hand grasping his wrist, pulling it, bringing it closer. And the lips, those full, red lips he'd stared at in the elevator, approached his. They never quite touched. They remained suspended, a millimeter apart, a breath away, in that neutral space Ethan had spoken of, that thick wall, that interstice where desire isn't yet action but is already everything.

Luca felt the heat of Ethan's mouth, smelled the scent of his breath, felt the vibration of his voice repeating, "You like to observe, don't you?" But in the dream, observing was no longer enough. In the dream, Luca wanted to go beyond. He wanted to break the boundary. He wanted those lips to descend, for that warmth to solidify, for that neutral space to be occupied, invaded, conquered.

He woke up with a start.

The apartment was pitch black. Sweat had filled his back, forehead, and temples. His pulse, his left pulse, was throbbing with a rhythm that wasn't his heartbeat. It was the memory of the touch. It was the desire for that touch, repeated, extended, taken to its logical conclusion.

He stood up. He went to the kitchen window. The inner courtyard was bathed in a bluish light, that of the dawn that was slow in coming. And in the window of 3B, the one corresponding to his, there was a light. Dim, like that of a bedside lamp. And against that light, for an instant, Luca saw a shadow move. A profile. A torso.

Ethan was awake. Maybe he wasn't asleep either. Maybe he was standing too, in another kitchen, in front of another window, looking toward 3A.

Luca raised his hand. With a movement that frightened him with its audacity, its desperation, he touched the cold glass with his fingertips. A gesture that had no witnesses, no visible recipient. Yet, as he did it, he felt that gesture cross the space of the courtyard, cross the humid air, cross the confines of brick and plaster, and reach someone.

On the other side, in the shadows of 3B, something moved. A hand rose. A finger touched the glass.

And Luca understood, with a certainty that pierced him like a hot blade, that the game was no longer a game. That the gap was narrowing. And that next time, because it was now inevitable, it was written in that geometry of desire they were both drawing from memory, the boundaries would not hold.