A scent-matched but unbonded Omega-Beta pair. A Heat Seekers match with her older brother's Alpha best friend. And a litter of newborn kittens.

Nick
My niece complained that I'm too old to still be single, so she signed me up for the Heat Seekers app. Where I matched with a pair, Fenna, my best friend's younger sister, and Britt, her girlfriend (though they insist they're 'simply friends'). Seeing them for the first time in two decades and literally falling on my ass when I catch a whiff of Fenna's scent, wasn't how I expected to find my scent matches.
Is this what meeting your fated mates is like? Is it always this intense?

Britt
My heart breaks watching my childhood best friend and scent-matched Omega lose her spark of joy every time she locks herself in her nest when her bond disorder acts up. Mating with her scent matches is supposed to help, but she refuses.
She was traumatised after watching her Omega aunt forced to break the bond with her Beta girlfriend by some Alphahole, and now she won't bond with me until we've found everyone in our pack.
When Nick turns out to be our other mate, things were supposed to get easier. So why is everything unravelling at an even higher speed?

Fenna
Unlike what the doctor promised, my bond disorder is acting up more than before since finding Nick. So, I set a limit. We're going to take things slow, starting by building a close friendship.
That plan goes out the window the moment Nick appears in the middle of our hallway, a bag with his clothes and a cat carrier at his feet, ready to move in with us so we can co-parent a litter of newborn kittens.
I don't think midnight feedings and broken sleep are 'keeping things casual', right?

Knot Simply Friends is part of the Heat Seekers Omegaverse, a shared world series featuring an amazing group of Omegaverse authors all centered around an app that Omegas use to find partners for their heats. All books can be read as standalones, but you'll find lots of character crossovers in the series.