I'm still not entirely sure how it happened, except that I know exactly how it happened.
Marcus had been my coach for seven months. The sync was just practical — you know how it is, you clip in at the start of a long run and the pace system does the rest, your cardiac rhythms calibrating against each other so you're never working harder than the plan allows. *Intimate* isn't a word I'd have used for it. It's just data.
Except.
---
I hit the PR at mile eleven. I felt it before the watch confirmed it — that clean, terrible joy of a body doing exactly what you trained it to do. And I felt Marcus feel it too, that little stutter of pride transmitted through the link like a second heartbeat sitting just behind my own.
We reached the trailhead. I bent forward with my hands on my knees, laughing, and he was laughing too, and then we both went quiet because the sync hadn't dropped.
It should drop within thirty seconds of stopping. Standard reset.
His pulse was still in my chest. Slow now, coming down from the effort. I could feel him decelerating.
"Marcus."
"I know." He was looking at his wrist display. "It's lagging. Should clear."
But he looked up at me instead of the display, and I felt his heart rate climb again — not from exertion.
*Oh.*
"Still there?" I asked.
"Still there." A pause. "Yours too."
The parking lot was empty. Late October, the light going gold and sideways through the trees. He was standing close enough that I could see sweat drying at his collar, and I was aware of my own heartbeat now in a way that felt almost embarrassing — this visible, legible thing he was carrying in his chest.
"I want to kiss you," I said, because there was no point being coy when the man could literally feel my pulse spike.
He closed the distance and kissed me slowly, one hand at the back of my neck, and I felt two heartbeats accelerate in perfect sync.
---
We made it to his truck. *Barely.*
I climbed into his lap facing him and he pulled my running shirt over my head without ceremony, his hands moving over my ribs like he was learning something, his mouth at my throat. I got his jacket off and his shirt, and then his hands were on my hips, thumbs pressing into the hollows there, and I rolled against him deliberately and felt him exhale hard against my neck.
"Yeah?" he said against my skin.
"*Yes,*" I said, and meant it entirely.
I worked his pants open and he slid his fingers between my thighs and I bit down on his shoulder when he found the right pressure. *There.* We moved together slowly at first — careful, finding each other — and then less carefully, the windows fogging, his forehead pressed to mine, both of us breathing in the same broken rhythm.
When I came I said his name. He followed about thirty seconds later, his hands gripping my hips, his face buried in my hair.
---
Afterward we sat tangled together in the reclined seat. The display on his wrist finally showed the sync had cleared.
Except I could still feel his heartbeat. Slower now, satisfied. Resting against mine like it had always been there.
*Personal record,* I thought. *Two of them.*
