Heat [Omegaverse, Brolby, SamandColbyFic]

Chapter 1

Sam gasped, grinding up harder into Kat.  He heard her whimper, but her tight grip holding his hair to the pillow didn't falter, and she just arched her pelvis.  Sam assumed she was pressing his cock against her g-spot.

"Kat. Kat..." Sam grabbed for her hips, but Kat just gripped his hand and pressed it back down into the bed, not changing the rhythm she was riding him at.  Sam growled, but he knew better than to challenge his beta girlfriend.  He may be the Alpha in their relationship, but Katrina had a dominant streak he had no problems enjoying. 

Especially seeing as how he was going to cum if she kept this up.

"Kat, Kat, I'm gonna..."

"Me too," she gasped back, each downstroke grinding her clit against him. 

He groaned back at her, pulling against her grip on his hair, pushing against his wrist pressed to the bed.  Not that he really wanted her to let go.

He enjoyed this way too much.

And then she bit down hard over their mating mark on his neck, and Sam swore he just needed a couple more thrusts, could feel his cock swelling at the base, ready to lock into her body, and Kat was gasping, whimpering in air and growling it back out, obviously close too...

But then there was someone slamming on his bedroom door.

"What the fuck?" Sam demanded loudly as Kat full on turned and snarled at the door.  It was a territorial sound, and if the scents they were throwing off hadn't made clear what they were doing, that reaction certainly did.  The person on the other side of the door didn't seem to care however, giving Sam a short list of who it could be.  The person, probably another roommate, continued to bang on the door, and as Sam slowly started to focus on the voice, he realized who it was, and what they were saying.

It was Brennen, demanding in an angry but panicked voice, "Dude, why the fuck didn't you tell me Colby was a fucking omega?"

And that stopped Sam and Kat dead.  "What?" Kat asked while Sam shook his head, rolling his eyes.

Colby was a beta.  He'd hit the eighteen-nineteen time period where the second gender of Alpha or omega would have presented itself and he hadn't presented.  That was unlike Sam, who had gone careening into an Alpha rut at nineteen that he was so glad Kat had been there for.  They hadn't been dating long at that point, just about six months, and Sam had been so worried that it was going to scare her off.  But it hadn't, and they came out of that so much closer than they had been.

Kinda happened when Kat had watched him literally beg her for sex and relief from the burning, aching lust for three days.

"He's a fucking Beta, go away Brennen," Sam shot back at the door, and Kat had let go of his trapped arm at the disturbance so Sam took the opportunity to grasp into her hips and press up into her again.

Kat's broken gasp lit the slowly lagging fire in his loins again and he was more than willing to ignore Brennen at this point when he heard Brennen yell, "Then please fucking explain to me why a Beta has gone into fucking heat!"

Sam and Kat paused again, looking at each other.  Finally, Kat groaned, pulling herself off of Sam to a bereft whine from him.  "I swear to God, Brennen, this had better not be a prank." She quickly pulled on an oversized T-shirt and sweatpants, letting Sam scramble with the blankets when she pulled the door open.

And Sam didn't know how he hadn't smelled it before.  It must have been from the scents that he and Kat were throwing off, but what Sam could smell through the open door was undeniably omega heat.  "Shit..." He gasped, unable to control the way his cock throbbed at the smell, the desperate scent of heat, and he had to pause a moment, because underneath that aroma of delicious, aroused omega...