Yes, and time for a lot of fucking.

John and Kira discussed kids, and she agreed, life was getting lonely only knowing other people at a distance, and at that only for a decade or so. But she wasn't sure about watching more of their kids get old and die again.

"Dad, how do we know we can pass on whatever it is that keeps us young to them?" Kira asked, "What if we just end up watching them grow old and die again, that hurt a lot. I just don't think I want to do that again."

"You remember when we changed, don't you?" John asked, "I mean the moment it all changed. When we could hear our heartbeats, hear birds flying? When we started to see things, and feel things we had not before. You remember that moment right?"

In truth, it was a moment Kira would never forget when her dad came inside her for the first time she felt a wave of emotions and sensations like nothing she had felt before. Both of them orgasmed so hard they fell into a hard sleep, sometimes for hours. There wasn't anything else like it, and in not wanting to have kids they had deprived themselves of that feeling for decades now.

"Yeah dad, I remember, like it was yesterday," Kira replied. "I miss that feeling, I miss it quite a lot."

"I do as well baby," John replied. "I miss it quite a lot, and if nothing else, we get to feel it again for ten months or so if we decide to have another child,"

"But it would mean fucking them? Our kids? You want to do that?" Kira asked, it wasn't the **** that bothered her, she just wanted her dad to herself.

"Baby, it might not be just me doing it," John replied gently. "If we have a son you would need to do it, not me. And it might not even work, this is a theory of mine."

Kira thought about it, she had never even thought of their son remotely in that way, and he had been a tall and beautiful man.

She had only fucked a few men in her life, her dad, two guys at the lab during testing on how the new strand moved, and a teacher in high school. And she didn’t want to add to that number. Her dad was enough.

She remembered telling her dad she had only given a handjob when trying to talk him into being her donor, which was a lie. Even now she didn't want to tell her dad about all that she had done before she started fucking him.

Kira had given her share handjobs and blowjobs in high school, like most girls. It was just a part of being a girl in high school, her friends did it, guys expected it, it just happened.

Her first handjob had been at a party her freshman year with an older guy she didn’t really know. A girlfriend she had gone to the party with ditched her and the guy was driving her home.

She didn’t want to call her dad and tell her she got ditched at a party she wasn’t supposed to go to, and the guy was getting pushy. He kept asking for road head, but she wasn’t going to suck his dick. She was dating another guy at the time and didn’t want to cheat on him.

When he parked the car, he made his move and kissed her and she liked it. He groped her tits, and she liked it even more. As they made out and he continued to fondle her breasts, already full and beautiful, he pulled her shirt up and exposed one.

She felt good in the moment as he sucked on her tit, not worrying about her boyfriend in the moment. She had been drinking and was horny, and this guy had stopped like halfway back to her house, the last thing she wanted to do was have to call her dad at the lab to come and get her.

To try to get it over with Kira took his dick out and gave him handjob, which didn’t last that long.

The guy was so happy to have his dick in her hand and his mouth on her tits that he came all over her hand and arm in minutes.

After that she had let her boyfriends suck her breasts when they made out, and had started giving handjobs. She became used to jerking them off while they played with and sucked her tits, and when some of them fingered her.

She had liked one new guy but had not been willing to go all the way with him, still holding back.

With this guy, someone she liked more, Kira sucked his dick. She had met him not long after the guy at the party, and it had progressed quite quickly.

Kissing became making out and groping, which had moved on to a handjob, but this guy she really liked. Soon he was pushing her head down towards his cock, and she didn’t resist this time. She tasted and smelled his cock, and it was very enticing.

She had ended up given the guy a lot of blowjobs in the months they were together, soon it was nearly every day. He loved it, and he was a popular jock on the football team, so she did it for him. She didn't swallow for him, his cum had tasted disgusting. She did let him cum in her mouth each time, but she alway ended up spitting his cum, but always having his taste on her lips when she got home.

The guy had only ever complained so much, because Kira was already unbelievable beautiful, and she had gotten pretty good with a cock in her mouth.

This only lasted so long, as the guy found a girlfriend who would put out. And this continued for a while. She would date a guy, after a couple of dates they would make out and he would grope and usually suck on her breasts.

On the third date guys she dated expected her to jerk their cock and usually to suck on it. It was just a part of being a girl her age. In talking to her friends they all sucked off as many guys as she did.

The first older man she was with was Kira's Algebra 2 teacher. She scored poorly on a midterm but didn't want to lose her straight A's, so one time she stayed after class and tried to see what she could do to save her grade.

His creepy smile told he what she had to do. No extra credit, no make up test. He was flirtatious, and she knew what he wanted. She kissed him, and in moments he had her shirt open with his mouth on her big tits. And he pulled her hand down to his already erect cock, at first in his pants but soon he pulled it our and she was giving him a handjob as he sucked on her nipples.

He lowered his pants and then pushed her down to her knees, and she knew what was expected. She sucked his dick. She hadn’t wanted to, but she hated the idea less than she hated the idea of losing her A in Algebra 2 and explaining it to her father.

She hated it. He had a short and fat uncut cock. Her teacher wasn't in bad shape, but he also wasn't a prize either. She was not attracted to him at all.

He had locked the door and made her take her top off, and her bra, letting him see her topless in the full light of the room. He had even taken a couple of pictures of her topless with his phone.

Pictures of her topless, pictures of her with his cock in her mouth, with his cock laying against her face, all of it.

Kira sucked the older man's cock until he came. It took some work, using her hands and working him hard, he lasted a lot longer than most of her boyfriends.

She had given blowjobs where a boyfriend had cum inside of two minutes, but not this older man, she had to work on his cock for fifteen minutes.

He had been forceful, holding her hair with both hands as he fucked her mouth. He said things to her she didn’t like, but there was nothing she could do about it.

He called her a slut and a whore, he talked about what he was going to do the next time, and he talked about putting a baby inside of her.

Then without warning, his salty and bitter cum started to fill her mouth. It was hot, thick and disgusting.

It tasted terrible when he came inside of her mouth, without any warning at all, but he told her to swallow and she did. She didn’t want to, but he insisted, and he recorded a video as she swallowed, making her show him her empty mouth after she was done.

He groped her big tits as she put her top back on, talking about how he was going to fuck her next time.

A next time that she had never intended to allow.

But the next time had happened, when she bombed her final her sophomore year. And she had allowed that teacher to bend her over his desk and fuck her.

He undressed her and marveled at her beauty, admiring her big ass as he bent her over his desk.

“Kira, you keep fucking up your grades and I just might fuck this pretty ass of yours,” he said as he pounded her doggy style. “Maybe you failed on purpose, you teasing bitch, maybe you want this fat cock inside of you...didn’t you? You filthy little whore…”

She looked back and he was recording her again as he filmed her with his phone, “does that piece of shit boyfriend know you are doing this? That he is a cuck? Does your dear old dad know his daughter is a worthless whore?”

He had been her first, and she had hated it. It had been made worse by the teacher’s treatment of her. He had called her a teasing whore, and when he came, he pushed her to her mouth and came into her mouth. And he told her to keep it in her mouth as she dressed, making her swallow just as she was leaving his office. It was gross.

It had put her off of fucking pretty badly, and her boyfriend paid the price, only getting handjobs and blowjobs.

Her boyfriend at the time left her, hearing a rumor that she was fucking a teacher, and she was not convincing in denying the story.

When her junior year came around she met a new guy who had just moved in, and it had gone better than most, lasting most of the year.

He had seemed content to get handjobs and blowjobs, and to be allowed to put his cock between her tits and fuck them, but in the end it was not enough for him either.

When the disease came along, her boyfriend became a donor and dumped Kira, he waited until the end of their last date, when she sucked his cock in his car in front of her house.

He broke it off after he came, leaving her with a mouthful of cum to swallow, but with her mouth full of semen he broke it off, telling her he was getting laid every day at school now. He didn’t need her.

She had his cum in her mouth as she left the car, planning to spit it on their lawn, but she couldn’t.

As she walked up to the door her dad had opened it for her, so instead of spitting her now ex-boyfriend’s cum on the lawn, she had to **** a smile for her dad and try to get to the bathroom.

Her dad however had noticed she was upset and insisted on talking to her, forcing her to swallow. She swallowed the cum of a boyfriend who had broken up with her while his cock was in her mouth. It disgusted her deeply. Why were men such pigs?

Her ex now had all of the young women he wanted, and these girls put out. He was now able to ass fuck any one of many girls who had the disease, and some female teachers. It was a good time to be a donor.

Kira’s Algebra teacher was also a donor, and he showed a lot of interest in being Kira's personal donor. He offered to satisfy all of her needs in pretty much the creepiest way possible. "You can have all the dick you want baby, anytime you need."

He said this from behind in her ear one day after her diagnosis, pushing her against her locker and leaning into her, pressing his body against hers.

He was grinding his erection into her ass and groping one of her large breasts. Not that guy, anyone but that guy.

Things were different now, after the disease, people thought about sex and sexuality differently. Young women were out of their mind they were so horny sometimes, and you would see people making out in the halls, you saw young women on their knees sucking cock every day.

This teacher had opened her shirt and had her tits out groping them, and nobody paid it any mind.

And it wasn’t just him. Numerous members of the faculty were donors, and seemed to want to focus on their students. A history teacher, an English teacher and a football coach. They had all pulled her aside and offered to dose her.

And pretty much just like her Algebra teacher, they groped her, they pushed their hard cocks against her ass and mocked fucking her, and it felt gross to her.

Kira had decided then and there that she would not accept any treatment at school, no guys, no teachers, not her pervy fat principle who was on the donor list and seemed to have a keen interest in her as well.

All along it was going to have to have been her dad or nothing. She hoped he never found out what she had done, the sex, the blowjobs, all of the fucking blowjobs.

Kira kept this shame deep inside.

Her mind came back to the present. Could she fuck her own son if it meant imparting this lasting health to him? Was it worth that? Would it hurt what she and her dad had? A big part of her wanted to keep things as they were, having her dad just to herself forever, but she knew it was going to be very lonely if they did that.

They needed to try.

"Ok, let's have another baby," Kira replied, her dad did not seem relieved, he seemed conflicted. "So this means you fuck me, right dad?" Kira said with a sarcastic smile.

He smiled and kissed her, groping a large breast and exposing it, they fell into each other's arms and were naked and fucking each other in minutes.

They had fucked thousands of times over the last 100 years, they had no idea. But it always felt like the first time. Every time was special, they were always connected.

John always had a fully hard cock and staying power, and Kira was always tight as a young lover would be. Her body always healed.

When they joined again, the anticipation of the powerful orgasm they would share was hard to miss. They loved each other deeply, and finally after so long they would feel it again. They would feel the special power of her dad cumming inside of her.

It had been a long time since John had cum inside of his daughter, and when he did, they both remembered what they had been missing.

Kira groaned, loudly and slowly, "Oh fuck dad, I love you!" She growled as she felt his cum enter her body, feeling the immense pleasure they had missed for so long.

She held him tightly, and as John started to pull out after he came, she wrapped him up with her strong legs. "No dad, stay inside me, keep it deep inside of me, please! Leave it in me while we rest.”

John kept slowly fucking his daughter, the beautiful woman he had married years before, with short and slow strokes, he kissed Kira's neck and her cheek before kissing her deeply, with the two of them passionately working their tongues in the other's mouth.

The felt the emotions and the energy they did all those years ago, but like it was the first time. It was as if time slowed for them at this moment. He leaned back and admired her great beauty, her large breasts, covered in their shared perspiration.

Kira was orgasming as well, he could feel it, he could see it in her eyes. Her head arched back and she let out a moan that felt like it would last forever. They had no close neighbors, and that was a good thing, people would not understand the sound she made.

And then he fell into her arms and they held each other tightly, as darkness overcame them, both falling into a deep sleep. The post-coital rest they had both come to expect from their lovemaking.

When John woke up, it was dark out, and Kira was awake, sitting next to him with a cup of water from the well they had behind their house. These days people had to purify well water, which was no longer considered a clean source of water.

She always tended to wake up first, but he could see it in her countenance, he could feel the change in her, she had needed that as badly he had. He needed to find a way to control insemination, some method of allowing them to share that feeling without bearing a child each time.

The two of them spent the next weeks doing this, trying to wear each other out and failing to do so, it was a great couple of weeks, forgetting about the troubles of the world around them and just enjoying each other, and the sensation of her father finishing inside of her. A feeling both of them had missed more than they knew.

A child was coming, John was sure of that, and if nothing else, the next months would involve a lot of what they just did. The more they did it, the more they wanted it, and the lived in seclusion away from town, so there was nobody to bother them.

It was going to be a good few months, maybe they could keep up this pace or something like it when Kira was more pregnant. But now John decided he didn't need to just find out if they could move their mutation to their children, he needed to find a way to inhibit pregnancy. There had to be some way to accomplish both.