Chapter Five: Breathing Between Heartbeats

The hospital was quiet in the early morning, but for Iris, nothing felt calm. Her heart thumped faster than any patient’s ECG she had ever monitored. Today, she was shadowing Nathaniel again, alone in the cardiology wing, and the tension from Selena’s presence the day before lingered like a shadow.

“Focus,” she whispered to herself as she stepped into the lab, her gloves snapping into place. She adjusted the stethoscope around her neck, reminding herself she was here to learn—not to be intimidated.

Nathaniel entered with his usual calm precision, and the moment he saw her, his gaze lingered longer than necessary. That small pause was enough to make Iris’s chest tighten.

“Good morning, Miss Moore. Today we’ll focus on stress tests,” he said. “I need your full attention.”

“Yes, sir,” Iris replied, trying to steady her breathing.

As they worked, he explained each step—how to hook a patient up to the treadmill, monitor blood pressure, oxygen saturation, and heart rhythms. He guided her hands over the electrodes, his fingers brushing hers ever so slightly. Each time it happened, a spark ran up her arm, and her pulse, already elevated from nerves, jumped again.

“You’re gripping too tightly,” he said softly, lowering his voice so only she could hear. “Relax. Let the patient’s heart guide you, not your fear.”

Iris swallowed. “Yes… sir.”

He moved close to adjust her posture again, and this time, the air between them seemed to thicken, charged with something unspoken. Her breathing hitched, but she forced herself to focus, eyes on the monitors.

Then Selena appeared.

“Morning, Nathaniel,” she purred, stepping into the lab without knocking. Her presence was deliberate, invasive. Her eyes swept over Iris with thinly veiled contempt.

Nathaniel stiffened but didn’t let her see his reaction.

“I told you this is a workplace,” he said, low, calm, but with an edge that made Selena pause.

“I just wanted to see how my favorite cardiologist starts his day,” she said with a smile that didn’t reach her eyes. “I wouldn’t want to disturb anything…”

Iris felt every nerve in her body tense. She could hear her own pulse hammering. Selena’s gaze was predatory, designed to intimidate, to claim.

Nathaniel stepped between them like a wall. His hand brushed hers briefly, not by accident this time—protective, grounding. “She is my trainee. You will not interfere with her training.”

Selena raised an eyebrow, but Nathaniel didn’t budge. His voice dropped to a whisper, just for Iris: “Ignore her. Focus on your work. Don’t let her distraction cost you your confidence.”

Iris swallowed hard and nodded. The warmth of his proximity, the steady authority in his voice, sent a shiver down her spine. She forced herself to concentrate on the stress test, guiding the patient’s arms, adjusting electrodes, reading the monitor.

But she couldn’t ignore the way Nathaniel’s presence made her heartbeat accelerate—not just from fear or nerves, but from something deeper, something she hadn’t anticipated.

“You’re doing well,” he murmured, leaning close to point out a subtle spike in the ECG. She felt his breath against her ear. “Notice how the ventricle responds… and don’t let the distraction affect your observation.”

Her breath caught. She tried to steady it, but he was so close, guiding her hands with gentle authority, correcting her stance, brushing her hair from her face as he leaned in to examine the monitor. Every movement made her pulse race, every word made it harder to breathe.

Selena’s voice echoed faintly behind them, asking Nathaniel a question, but he ignored her. His eyes stayed on Iris, intense, protective.

“Good,” he said finally, stepping back slightly. “You’re reading the results correctly. That’s progress.”

Iris’s chest heaved. She wanted to hide how much her heart was actually racing—how much Nathaniel’s proximity, his attention, made her feel exposed, alive, dizzy.

Later, when the training ended, Nathaniel called her into his office. The hallway felt charged, almost electric, as they walked together. Selena had left, but the memory of her interference lingered like smoke.

He closed the office door behind them. The quiet was heavy. The tension between them hung like a live wire.

“Iris,” he said, his voice low, smooth, commanding. “You need to know something.”

Her pulse hammered, her palms damp. “What, sir?”

“I will not let anyone—anyone—undermine your place here,” he said, eyes dark, intense. “Not Selena. Not the staff. If she tries again, you will have my full support. Do you understand?”

“Yes,” Iris whispered.

His gaze softened just a fraction, the mask of control slipping to reveal… something else. Something human. Vulnerable. Desire. Care.

“Iris…” he said again, stepping closer, close enough that she could feel his warmth, his steady heartbeat under the crisp white coat. “Do not mistake my protection for… indifference.”

Her breath hitched. The words, the proximity, the tension—they were almost unbearable. Her hands clenched at her sides, heart hammering.

Then the knock came.

Both of them froze.

“Iris? Nathaniel? Are you in there?”

It was Selena’s voice.

Nathaniel’s hand went to the door handle. He turned to Iris, eyes dark with warning and something unspoken.

“Stay,” he said quietly. “This… is going to get complicated.”