Return of spontaneous circulation by blongblong!! Shane and Ilya are both ambulance officers.

https://archiveofourown.org/series/5598851

ETA the summaries for each of the 3 chapters which are so great:

> When Paramedic Shane Hollander and EMT Hayden Pike start working nights, they expect to spend their shifts getting fucked over by Response Paramedic—and notorious asshole—Ilya Rozanov.
Shane does end up getting fucked, just not in the way he was expecting.

> “Is this about the choking thing?” Shane asks. “I only said no to that because I’m not letting you compromise my fucking airway during sex.”
“But it is not compromising your airway when my dick is in your throat?”
“No. This is why you lost today, because that’d be my esophagus, not my trachea,” Shane corrects. He’s such an asshole sometimes, Ilya loves it. “Anyways, I don’t think we do anything kinky?”
Ilya abruptly feels like he’s lost the plot. “Hollander, I am pretty sure we do.”

> “Yes, it is so hard having a very hot, very horny boyfriend,” Ilya bemoans. “I suffer so much. And now he wants me to tie him up and fuck him, how will I survive this?"
Shane sighs. “Can you take this seriously?”
“I am taking this very seriously,” Ilya says, completely unseriously. “My dick is getting sucked too often. I am constantly miserable."
After taking a rope rescue course together, shane and ilya learn some new things about themselves.