"Good Morning, Citizens, Today's news is grim. The Government has announced an official state of emergency regarding the Cumdeep 69 virus, which has swept through our fair country and caused mass confusion and terror. This disease has spread quickly and has a high rate of mutation, as such, government officials have suggested that all citizens should quarantine and avoid leaving their homes under any circumstance. Doctors, clerics, and virologists of the CDC are all working hard to find a cure for this virus, but so far they've had no luck. If you feel ill at all, please stay home and stay safe. We will keep you updated on further developments."
Another news anchor collected a few documents as she continued, "While it is unfortunate that the Cumdeep 69 Virus has escalated to a global pandemic scale threat, forcing our country to quarantine. The governor would like to emphasize the global procreation orders are still in full effect, a couple that conceives a child will be officially betrothed and married by the state regardless of circumstance. Virus or not, they will be expected to continue producing offspring for the good of society."
"As a quick refresher of all there is to know of the Cumdeep 69 Virus:
It is a highly contagious but non-fatal disease that can only be contracted through sexual contact with a carrier. This means direct vaginal contact, oral sex, anal intercourse, breastfeeding, sperm donation, and even passive masturbation. It is a sexually transmitted disease that affects men, women, children, and animals. Once infected, those affected will begin to experience the following symptoms within 2 hours.
Symptoms include but are not limited to A sudden increase in libido, increased sperm production, increased lactation, heightened virility and fertility, enlarged sexual organs and breasts, and an overall desire for copious amounts of sex not unlike a heat or estrus cycle, along with heavy musk. Those who contract this disease will be unable to control their urges and will engage in unprotected sex without hesitation. Those afflicted are also known to become Sexually aggressive and will grope, grind, hump, or otherwise molest any individual near them. Including family, members of the same sex, and strangers alike. 
In addition, the victims may exhibit strong sexual fetishes. Some common examples of these are breeding, cock worship, incest, autofellatio, cuckoldry, public sex, and more.
Victims of the virus are known to breed prolifically and are able to produce multiple offspring at once. An individual infected with this virus can expect to give birth to between 4 and 10 children per conception. Outside condoms, these pregnancies will occur regardless of contraceptive use.
Citizens who have yet to contract this disease must remain quarantined in their homes or risk being assaulted by those already afflicted. For your safety, please continue to stay indoors until further notice from the government. Thank you and stay safe."
***

Maya looked over at her brother, who was watching the television with a worried look. She and the rest of her family had come over to Avel, her older brother's,  home for a family dinner. Maya had agreed to help clean up for the weekend, but with the country on quarantine, she'd be stuck here for an even longer time. While that in of itself wasn't a problem… and while no one seemed to be under the virus' afflictions, Avel was already showing symptoms. Maya couldn't help but stare in awe and horror at his knotted horsecock, a mutation he was born with that was completely unheard of in Kobolds.
She'd always considered him a gentle soul; kind, sweet, and very understanding. He treated her well, and she loved how protective he could be when she needed it most. She just hoped that he would survive this ordeal. And that she would survive it with her virginity intact.
Avel was resting on the couch, trying to ignore the itch he felt coming from his groin. Maya noticed her brother's condition and decided to check on him. She sat down next to him, and he turned to look at her. "Hey, bro…" she said, nervously. "Are you alright?"
"I'm fine," he lied. "Just got a little horny, is all. I'll get over it soon enough." His eyes were constantly being drawn towards his sister's massive cleavage. "So, what do we do now? You're going to be stuck here for a while. I could call and see if you could get an escort home, so you won't be stuck with someone who has the virus?"
Maya shook her head. "No, I don't want to risk that. There are a lot of people out there right now, and I wouldn't put it past some of my friends to have caught it as well. It's risky but, I think I should stay here a bit longer, until everything cools off a bit at least. Just in case. It's safer that way." She replied, trying to hide the worry in her voice. She wasn't looking forward to being in proximity to a carrier of the virus, but she knew she'd be safest with her brother.
Her brother nodded. "Alright, then. We can stay together, at least. I'll try to keep myself busy in the meantime, though." He said, defeated. He knew there was no arguing with his little sister, although truth be told, he was overjoyed to be confined with his sister. Even before the virus' influence, he always had an obsession with his sister and her beautiful body. The thought of having her around all day long, completely at his mercy, made his cock twitch in his pants.
He looked over at Maya again. Her green-scaled tits were glistening, her child-bearing hips barely covered by her shorts. She was definitely a sight to behold, and he couldn't wait to make her his woman, his wife, his breeding slave. His hands began to move over his crotch in anticipation. "Well, let me know when you need anything, OK?" He said, giving her a lopsided grin.
"I will, Avel. We're going to be okay." She said, pulling him into a hug, her round, E-cup breasts pressing up against his chest. "I promise." Avel shuddered in her arms, his erection was becoming unbearable. It stood at attention, threatening to burst through the fabric.  His fat meat was already nestled under her rear and tail. "A-Avel, you're poking me..." She said, trying to push him away, but his arms were hooked behind her back as he dragged her to his bedroom.
"Breed..." he growled softly, Avel's hands moved to her waist, and started to lift her shirt. Maya was taken aback for a moment, but quickly realized what her brother was about to do. She didn't think the virus would have this much of an effect already!
"W-wait Avel no! We can't!" She said, panicked.
But there was no stopping the powerful force of nature that was his lust. With a single, swift motion, he pulled her top up. Her melon-sized orbs popped out from underneath her bra, and he couldn't resist them. He cupped each one in one hand and undid his pants with his other, moaning loudly in pleasure.
"Avel, stop... Please!" she pleaded. Avel's tongue came out, and immediately licked her left nipple, making Maya moan in pleasure. His hand shifted to her ass and pulled her leg up. The only thing covering her pussy was her sweatpants and her thin panties, but that didn't stop his foot-long cock from entering her. Clothing and all, he entered inside of her balls deep and mating pressed her into his bed below.
Maya groaned as Avel's thick member stretched her open. He began thrusting his hips, stuffing her cunt with his fat cock. She felt so good, even with her clothes blocking her raw sex. Maya hated that she also loved the feeling as well, her folds were moistening as he plunged deep into her forbidden slit. His cock was pushing against her cervix, she couldn't let him continue or else he'd cum!
Avel suddenly pulled his dick out and pushed her down onto the bed. With one fluid motion, he ripped off her sweatpants and panties, throwing them across the room. Her pussy was now exposed to the air and was already soaking wet. He grabbed her legs, and spread them wide, exposing her swollen lips to the air. Avel smiled wickedly, and placed his cock at the entrance of Maya's slick hole, rubbing it along her folds.
"Avel, please... Don't do this, or you'll get me pregnant!! Then we'll have to get married!" She begged. Another wicked smile painted his face, as he pushed inch after inch deep into his sister.
"That's the plan, little sis"
His hips slammed forward, burying himself into her tight pussy. Maya screamed out in pain and pleasure as his massive cock completely filled her raw. Her eyes rolled back in her head as she felt every inch of his cock stretching her insides apart.
"You feel so good, Maya," he moaned, still thrusting his hips. "I've wanted to do this for years!"
"Please, Avel! You don't know what you're doing!!" She yelled, but Avel paid no mind. He kept ramming his monster cock into her, sending waves of pleasure through Maya's body. She hated how good he was making her feel, she hated that he wanted to do this and had her completely at his mercy. Her body was betraying her, she loved how big and thick his cock was, how rough he was treating her. She knew this was wrong, that in mere moments she'd be knocked up by her own brother. Even worse, the moment he impregnated her, they would have to get married, and from then on she'd be his personal breeding slave. Why did that sound so heavenly to her?
With a loud grunt, Avel buried his entire length inside of her. Maya could feel his knot bumping against her entrance, and she clenched around him as best she could, she couldn't let his knot get in. He pulled out, and slammed back in, burying himself in her depths again. Her pussy was so tight, squeezing around his girth, milking him for every drop of seed he could give her.
He pulled out once more, only to slam back in. Her breasts bounced as he fucked her. It was too much, she couldn't take anymore, She cried out in ecstasy as her inner walls clamped down on his shaft in orgasm, taking him deeper than ever before. She was cumming hard, her juices flowing around his dick, which made him fuck her even harder. Her first-ever orgasm was going to be from a womb-wrecking mating press from her older brother~ And she was going to be his bride, whether she liked it or not.
She squealed as he slammed into her, unable to control herself anymore. He pulled out and rammed his cock back into her. Maya moaned loudly as another orgasm shook her body. She couldn't believe she was crying out in pleasure while having sex with her brother, she couldn't believe she was orgasming with his cock lodged inside her. This was so wrong, but it felt so right.
Avel gave her one last thrust, his knot slamming into the entrance of her pussy and the tip of his cock flaring within her womb. She felt him throbbing inside of her, he was about to cum, and she couldn't stop him. "Oh gods, oh gods"
"Take my load, Maya. Give big bro lots of healthy eggs and be my bride." Avel growled as he planted his mouth on hers, forcing a long, intimate kiss. She melted as their tongues mingled together. She felt her womb tighten around his glans, the knot swelling inside of her, preparing to unload every ounce of cum in his balls.
Her pussy gripped around him tightly as he came, spurting rope after rope of hot cum deep into her womb. Maya cried out in agony as she felt his seed flood her ovaries, knowing that his hyper-virile swimmers were going to gang-bang and fertilize every egg in her womb. As soon as she felt him unload his seed deep inside of her, her old life was over.
Her body was changing as she became the newest victim of Cumdeep 69. She felt her body shudder as the virus rapidly took hold of her in excruciating pleasure. Her thighs grew thicker, and her breasts grew even larger and fuller, her nipples becoming erect and standing out from her chest. Her vaginal tract shifted in size and shape to perfectly accommodate her brother's bestial member, which grew larger and thicker still. She found herself becoming hornier by the second, it was like she was in deep heat, and she felt her womb whirr to life as her body started producing dozens if not hundreds of eggs to fertilize. Her body began to produce milk as the newly formed eggs in her womb were immediately swarmed by Avel's sperm.
Her hips moved of their own accord, grinding against her brother's. The feeling of his thick shaft rubbing against her cervix was indescribable. Avel hadn't stopped thrusting, in fact, he was already on his way to a second round of breeding Maya. She was too far gone to stop him now, She grabbed his body and drew it into hers as he mating pressed her all over again. The two kissed passionately, exploring their forbidden bodies like no couple ever had. They both knew what they were doing was wrong, but they didn't care, and neither did their bodies.
He knotted her again, more virile seed filling her body with another clutch of eggs courtesy of her brother. Maya moaned in bliss as her womb was filled to the brim. Her inner walls continued to contract rhythmically, trying to coax every last drop of sperm from her brother. He bucked in time with her movements, giving her even better friction as he sank deeper and deeper into her.
The world seemed to fade away, and the only thing left in Maya's mind was bearing her brother's children. Being Avel's fertile breeding bitch, his subservient hole was only to be used by him whenever he wanted. All Avel could think to do was to keep fucking her tight cunt, claim the whore before him as his own and breed her until he started his own clan.
*
After the devastation of the Cumdeep 69 Pandemic... Kobold siblings Maya Mara and Avel Mara held their government-mandated marriage ceremony. Due to the effects of the virus, their first clutch of 35 healthy eggs came not long before their ceremony. In attendance were their family members (both immediate and extended), as well as the entire population of the village. Many looks of shame were given to the pair by those in attendance, even if their wedding was forced by the government and their copulation caused by the virus. A positive side effect of the duo contracting the Virus was that they were the first to discover a cure, Non stop sex for 3 days! The word spread once the two came to their senses, and the Virus came to an end within a couple of months, disregarding a few fringe mutations.
The two were married under the assumption that they would continue to have sex every day so as to ensure 3 more litters of equal size. Avel would be the only male to mate with her, as his cock had molded her pussy to perfectly accommodate his shape and size. Maya was to live out her days subservient and pregnant, as their government reimbursement made sure to keep their large brood fed and cared for. Maya while happy to be a mother, now held a deep shame over being her brother's mate, having to cater to his every whim. Even after the virus left their bodies, the effects were still there, she was his woman, his possession, and his broodmare. His true love, in every sense of the word.
Avel, however, got precisely what he wanted, and was content to continue on this lifestyle. Every day, he would take care of his young and his sister/wife, then at night lay her down and knock her up once again. His fantasies of making his younger sister his own were now a reality, and he loved it. She was his, he had claimed her, and he would never let her go. Upon the altar of their wedding, he made that clear by consummating their bond in front of everyone, his cock sliding inside her and marking her as his for the whole village to see.
*
Cumdeep 69 Mutation: Kin Kink
When exposed to this strain, a male or female will develop a strong sexual desire towards any other member of their own family members. Any already present desires are intensified to the point that the subject is compelled to immediately act upon them, regardless of the consequences. However, the subject can control the urge to satisfy these urges, if doing so would allow an opportunity for the subject to further infect the subject of their desires.
Upon intercourse between two biologically related individuals sharing this strain, their sexual organs will shift to perfectly accommodate the others. Likewise, their physical changes will skew towards the preferred body types of their family member. This results in a very specific set of physical traits that make each coupling unique, but also consistent within themselves. Both subjects will only feel sexual satisfaction from the other, and will only have a desire to ever engage in intercourse with the other. Straining any present relationships as well as causing potential struggles with social norms.

-Notable subjects
Maya Mara and Avel Mara were the two eldest siblings of the same litter, Avel harbored a one-sided crush on his younger sister since sexual maturity. Maya on the other hand had no real interest in her older brother, nor romance period, having taken to the life of adventuring and spellcrafting.