Notes:

This story was written in front of a live studio audience, in a story thread at The 118 Discord.

This is fluffy smut filled with A/O tropes.

Meteor Shit made them do it.

There is a more complete warning list if you scroll to the bottom.

In the Early Days of the PornApocolypse

The meteor burned in its shallow crater with smoke rising up as it slowly cooled. Everyone had been exposed to it, but no one noticed anything, at least, at first. Then things began to change.

Buck was a little confused by what was going on, unsure why two of the women in his life had begun to walk a little funny, usually a few hours after Chim or the Cap had inexplicably taken off, suddenly remembering an errand, or in one memorable case, where Chim claimed he'd left Maddie's stove on.

Buck didn't notice anything different about himself, yet. He wasn't with anyone, and while yeah maybe he 'mastered his domain' a little more than normal, his sex drive had always been fairly high.

Something was going on with Eddie though, and it made Buck uneasy. They were still recovering from the lawsuit and the fights, and Buck was hyper aware of any change with Eddie, just in case he decided forgiving Buck was a mistake.
Eddie would find reasons to leave just like the others, but he would come back much quicker, and usually just a little more frustrated and on edge each time.

That was strange enough, but as it went on, he became... squirmier? twitchier? wiggly? It almost seemed like he'd smell something in the air, then Buck would see him pink up, just a little and he'd just be moving, while sitting still. You could tell he kept trying to stop, and he would, but it would sneak back up on him, and he'd be back to wiggle wiggle wiggle in his seat. This would inevitably lead to him disappearing and coming back frustrated, restarting the cycle.

Buck kept trying to smell whatever Eddie seemed to be smelling, but there didn't seem to be anything different on the air, at least that he noticed. There was just the normal smell of Eddie, a scent Buck had always appreciated, but nothing that seemed out of the ordinary.

Eddie seemed better, less twitchy and frustrated, during movie night. Buck noticed the sniffing then too, but with Chris settled beside him, when he scented the air he seemed to sigh in contentment. Unfortunately, Chris's soothing presence was about to disappear, at least for a week or so.

Eddie had reluctantly agreed to let his parents have Chris for a week before Thanksgiving, so long as he kept up his school work, since they weren't going to be able to make it for Christmas that year.

Chris had been gone less than a day, when Buck stopped by to see if maybe Eddie wanted to get a drink. Buck let himself in, and could hear Eddie moving somewhere further into the house.

There was a sad crooning noise and it pulled at something in Buck to hear it, and he followed it through the halls to Chris's room. Eddie was standing in the middle of the room, eyes tearing up, sniffing at the air, with that awful, mournful trilling sound coming from his chest.

After a moment, he seemed to catch a scent and spun to face Buck fully, and then moved towards him. They didn't have a lot of personal space issues normally, freely sharing pats and hugs and bumps, but this was a new level as the mournful trilling shifted into something that felt like a question and Eddie walked right into Buck's space and kept going, causing Buck to back up, until they were standing in the middle of the hall and Eddie was doing that purposeful sniffing directly against Buck's skin.

It as doing things to Buck, and apparently to Eddie too. Because he had gone from pale to flushed, breath coming faster and so close Buck could feel the sudden heat coming off his skin. The trilling took on a demanding note, and called to something inside Buck.

Eddie began almost herding him towards his bedroom, not that Buck was fighting him on it. He nearly fell by going though the doorway backwards, because the room was a shambles. The mattress was on the floor in the corner and piles of clothes, blankets, and God only knew what else was piled around it.

Eddie let out a more human sound finally, unfortunately it was a moan of pain. His hands were wrapped around his lower stomach and he finally spoke to call out a weak "Buck?"

"Yeah, Eds, what's wrong, what can I do?"

Eddie reached out to grab his hand, pulling it to his stomach holding it there with both of his own. "I need..." He groaned again, but not in pain, and suddenly Buck realized Eddie was quivering at his touch. He released his hold on Buck's hand leaving it rest on his lower stomach while Eddie began pulling at his own clothes.

"Eddie, what-"

"It's so hot." He whined, finally managing to unbuckle his belt and began working on the fly. Once it was opened, he stopped to pull his shirt off over his head, dislodging Buck's hand. Eddie momentarily trapped himself in his own shirt as he tried to bring Buck's hand back.

"No, please, I need..." He finally clawed his way out of the shirt, and bypassed Buck's hand to begin frantically trying to undress Buck.

Buck was harder than he'd ever been in his life, and completely disgusted with himself. Something was wrong with Eddie, this was not the time - hands, hands actually on his...

He pulled back, jumping away from Eddie, dislodging the hands that had just been touching him. He tried to clear away his thinking, to focus on helping Eddie, not sexualizing him, when he needed help. Suddenly the trilling was back, mournful in a deeper manner that tore at his heart.

Eddie stumbled back and fell onto the edge of the mattress. He'd almost managed to get his clothes off and he was pulling at them, shaking, one hand reaching out to Buck. Eddie managed to get his pants off and tossed them away.
The trilling pulled Buck closer, unable to deny the call even as he was mentally castigating himself for the perverse pleasure he was taking at the sight of Eddie, hard and writhing on the mattress. Instinct battling with morality.
The small scared voice Eddie finally managed "Buck, please..." and the reaching hand, broke Buck's resolve and he dropped down and took Eddie's hand, only to be pulled onto the mattress beside him.

some part of Eddie's overheated and overworked mind, recognized that words were accomplishing more than the call for his- for Buck, and suddenly words poured out. "I need you, Buck, please I'm so empty and alone and I need-"

Buck began pulling his own clothes off the rest of the way, without even realizing it, eyes locked on his- on Eddie.
"Anything, Eddie. What do you need?"

"You." Eddie breathed out, turning away from Buck, even while trying to pull him further into the ne- onto the mattress.

Buck's mind just stopped at the sight in front of him. Eddie on all fours, with his ass in the air, somehow trying to spread his thighs apart while still squirming. There was a clear fluid coating coating his somehow relaxed hole, and Buck was suddenly diving forward to catch a rolling drip of it that began slipping down Eddie's quivering thigh

He didn't even think about doing it before the finger was in his mouth and the flavor... The scent of his mate was all his mind could comprehend. Suddenly he was licking from the source as Eddie positively cooed in pleasure, and tried to open himself up more.

Buck's hands began to pet and stroke Eddie's hips and thighs, and then the squirming from Eddie intensified, and some small piece of sanity hit Buck and suddenly he was pulling away from his mate- no Eddie, whatever this insanity was, he was not going to give into it. He was going to be strong and move away from his... from Eddie and figure this out.

Then Eddie looked over his shoulder and moaned out "Alpha, please..." Buck fell on him then, any ability to stop or rethink gone as he gave his omega what he was begging for. Buck was inside him fully, before he even realized, both of them releasing harmonious trilling moans as he bottomed out deep inside his mate.

They began to move together slowly at first, and then breaths and thrusts sped up, until Buck was holding Eddie's hips and using his considerable strength to pound into him over and over. He didn't realize something even more unusual was happening until it was too late to stop it. His mates perfect tight hole was suddenly far tighter, and he thrust in, pushing past a tightened sphincter with one final push. His cock harder than ever, was throbbing in time with their heartbeats and surrounded by the perfect burning heat of his omega, locked together.

Eddie, began to speak, the words falling from his mouth, hurling Buck over the edge into the longest orgasm of his life. "Yes, Alpha, please, please... I need it. Please breed me, Alpha."

Buck reached to pull his omega into orgasm, one hand tightly wrapping around Eddie's hard cock and stroking while dropping filthy promises in his ear. "Oh yes, I'm going to fill you up, Eds. You're taking it so beautifully, Omega. I'm going to keep fucking this ass over and over until you fill up with our baby, and then, once we can hold them in our arms, I'm going to do it all again, and again. I'm going to keep your beautiful ass filled with my cum, always. Nobody else, Eds, nobody else will ever know how incredible you feel around me, locked onto me. You're mine!" Instinct took over once more, and Buck bit him on the left side of the neck, hard enough to bleed, to scar.
The moment Buck's teeth sank into his shoulder, Eddie came with a stuttering gasp. His body tightening up before relaxing entirely, knees giving way. The pair of them lay on the mattress, still locked together, arms wrapped around Eddie possessively. After catching his breath, Buck carefully turned them so they were on their side. Buck held him tight, his tongue absently licking across the bite mark.

They floated together in a haze, even after their bodies relaxed enough to release; Buck absently petting and cooing soft praises at him. "You took it so well, baby. Look at how pretty you are, practically glowing already. So beautiful, Eds" One hand wrapped around Eddie to rest where he imagined their child would grow.

As he lay there, Buck took in the things that his omega had built their nest with. He noticed many of his own things, that had somehow migrated over time, were adding his scent to the nest. It settled some unexplained half formed worry that his mate might have built a nest for some other alpha. He also noted some of Chris's things, bringing in the scent of family, of his family, now.

Eventually, Eddie became restless, heat rising again, and he turned to face his alpha, some essential thing missing, only half formed. He mindlessly mouthed at Buck's neck, whine low in his throat, desperate for some connection he knew should be there, but wasn't.

Buck felt his distress and that hot mouth on his throat, and finally realized what was wrong. He gently cupped the back of his mates head, holding him in place, and tipped his own head back, before he spoke, low and urgent. "Go ahead, baby, take what you need, I'm yours too."

Permission given for something he hadn't realized he needed Eddie licked a stripe up the side of his alpha's neck and then bit hard, creating a visible sign of ownership. Their bond, a half finished thing that had been preying on his mind only seconds ago, bloomed into fullness and he was lost in feelings of love, pride and gratitude.

The euphoria of the completed bond, the feedback loop of feelings and the rising swell of a second wave of heat, saw the two of them rutting against one another, until they were both hard and panting. Buck slid his hand through the slick starting to pool beneath Eddie, and then used that hand to wrap around both their cocks. Each of them fucking into it until they came, Eddie first and then Buck following.

Eddie pulled Buck's hand up and licked it clean, before Buck dived in to kiss him again, tasting their combined flavors before slipping from the nest to gather some supplies.

Buck was slowly coming down from their mating, able to think past the need to breed and take care of his mate, and God did he appreciate whatever this bizarre new bond was. He could only imagine how guilty he'd have felt; as if he'd used or even raped Eddie, if he couldn't feel all the love through the bond, and how much Eddie wanted this, too.

He grabbed a few bottles of cold water, a small bunch of bananas, for the potassium they'd surly sweated out, a box of cerial bars, both their phones, and a pack of wet wipes. He cleaned himself up, and then carried his haul back to the bedroom, trying to figure out why he was so fucking calm about all this. He took out a few wipes and gently cleaned Eddie off, and tossed them into the bin before crawling back up into the nest.

He pulled Eddie up into his arms and got comfortable, before starting the conversation he knew they needed to have. "I can't understand why we're both so calm about all this." He said, one hand playing with Eddies hair. "I mean, I think I've been in love with you in some way or another since the grenade thing, so at least on my part that's not new, but Eds my dick does a whole new trick now. We have both been physically and mentally altered. I mean don't get me wrong, this is fucking incredible, but we should both be gibbering messes."

"I think my sense of smell is freakishly improved, and I think my strange sniffer is telling me that you, my new mate, may in fact be pregnant. Even if you were somehow a girl and I'd gotten you pregnant I would be way more freaked out than I am now, you know just in general panic, but instead all these new instincts are just screaming how right this is."

"Oh there was panic, just not now. For days, I have been so fucking horny. First it was just this hint of a smell and then its all I could focus on this delicious smell that made me so fucking hard, but I couldn't do anything about it. The once or twice I actually managed to cum, it didn't do anything for me. The only times I wasn't burning up from the inside out was when I was around Chris, he smells soft and sweet and I just wanted to cuddle with him and keep him safe. Then Abuela took him to my parents, and it wasn't just him not being around to keep me calm. It felt like he was gone forever, like I'd never see or smell him again, even though his scent was still here, it wasn't fresh enough or strong enough. So I got lost in it, searching for things I just didn't have, not having my son, but also the source of that smell that had been driving me crazy."

"I don't know how long I was just lost, and then suddenly you were there, and I was wallowing in that smell, your smell. I was so far gone, into heat or whatever this was, that I couldn't even explain what I was feeling or needing. I thought I was just going to burn up, right next to the only thing that could save me."

Buck wrapped him in a hug, licking across the bite mark on his neck to calm them both. "I was so worried, I could barely think for wanting you, and I thought you were hurt, and I disgusted myself because I should have been helping you, not fighting off the urge to fuck you."

Eddie took his hand. "I've been in love with you since you saw me drowning, so far over my head trying to give Chris everything he needed, and stepped in and fixed it. You got Carla to help me find the support system I needed to get ahead of everything. I'm so glad these new instincts helped us find our way to this.'

"I, uh don't think we're the only ones. Now that I have a better idea of what happened to us, I think Chim and Cap were effected too. I mean not like, with each other, but with like Maddie and Athena."

Eddie nodded, "I think you're right. We need to talk to them, compare notes."

"No fucking way!" Buck said horrified.

"Buck, we need to-"

"We don't need to do anything that leads to me hearing about my sister's sex life, and Athena will just straight up murder us."

Eddie looked at him exasperated. "I didn't mean intimate details." He paused for a moment a look of fear on his face. "And don't you ever let on that you even thought I meant we should ask about Althea and Bobby's sex life. She would make the both of us pray for death." Buck held up one hand pinky out, and Eddie raised his own completing the promise.

"I think it was the meteor, at least if all of us were effected. anyway." Buck said, forehead wrinkling, cause he knew he was forgetting something, important about that meteor. He picked up his phone and started backtracking through his browser history, looking for the articles he'd read after that call.

"That sounds like a good working theory, I mean have you ever heard about anything like this on earth, ever? I mean outside of porn."

"Right." Buck said distractedly, and then he paled. "Oh Shit!"

"What is it?" Eddie asked, concerned.

"The meteor, oh my God."

"What about it, Buck."

"It, uh, they theorize it was knocked out of the path a comet."

"Okay, and?"

"Well, a lot of the meteor showers we have are when the earth passes through the path comets take around the sun, and all the bits that the comet lost, burn though our atmosphere, and either burn up or land."

"Okay, Bill Nye, and?"

"The path they think this meteor came from? Earth is scheduled to pass through it, in two days, and they're predicting a possible frequency of at least double the Perseid Meteor shower."

"Are you telling me, if the meteor was the source for this then the whole planet is about to pass through a whole ass sky of rocks that might have the same effect?" Buck just nodded, eyes wide.

"I am blaming this on your bad luck, Buckley." Eddie hissed.

"Why me?" Buck asked, pouting.

"Oh this just clocks as being right in line with your shitty luck. Exploding firetrucks, Embolisms, Tsunami? It just tracks that the A/B/O pornapocolypse would be on you."

Buck thought about it for a moment. "If you put it like that, fair." He said with a shrug.

Buck curled up around Eddie, and started humming.

After a moment Eddie smacked his ass and glared, "Really? It's the End of the World as We Know It?"

Buck kissed him on the nose and then sang, "And I feel fine."

Additional Warnings:

Possible dubious consent inherent in the A/B/O tropes of following instincts.

There may also be body dysmorphia issues since both parties change from base human to A/O with abilities including the creation of a knot, slick production and mpreg.

There are also mild biting/blood issues inherent in mate marking tropes.