As far as exes go, Manta and I had a pretty good relationship. We were in a two year relationship before breaking up from the mutual realization that she's pretty much asexual and I'm definitely not. We took a short break from each other and then started talking again and eventually started hanging out just for the pleasure of each other's company.
Manta is tall and wide hipped, more handsome than pretty, but also prone to moments of awe striking beauty. She's cold and logical, a scientist by trade, and I think we complement each other well - united by our love of humanity.
I in my turn am a survivalist, ritualist, and all around nature enthusiast making my way out of the Wilderness awareness school. I'm the emotional one in the relationship, but also a fairly solid rock all things considered. Between us we hold a lot of technical knowledge - which is fortunate given what happened.
It was late May when we decided to go camping in the shadow of the Olympic mountains in Washington state, in the ancient Salish holy place known as the Mima mounds. Nobody knew how they were formed - theories range from giant gophers to flash floods - but they're eerily similar and stretch for miles.
We arrived, set up camp, and decided to go exploring. Manta brought her backpack. I decided to leave mine. We walked around for maybe two hours, when both our phones started going off at once. We looked at each other, both answered, and both just heard a sound like howling wind. We both had perfect service. When we would hang up, the phone would ring again. We both thought it was pretty weird but turned off our phones and decided to head back.
The trail we were following just ended in grass. We hadn't come that way, so we turned around again, trying to get our bearings in the uniform mounds taller than us. We walked back and found the trail turned a different way than it had before. Following it just took us in a perfect circle around the mound where the trail connected to itself. We were pretty freaked out by now and climbed the mound to get our bearings. There was no campsite to be seen and when we looked down, there was no trail either.
Since then we've wandered those mounds endlessly looking for a way back, but we've never found one. We eventually made our way out of the mounds and into an old growth forest. We walked all the way around the mounds for the remainder of that day and never found the camp. Our phones had no reception now.
I built us a more rustic camp for the night, found some edible plants we combined with Manta's snack bars for dinner, and spent the night curled together.
The following day was spent discovering that we really were the only humans in this world, and while this place had the geography of earth, it was as it might have been without people. Washington was actually profoundly influenced by its native people. In all my searching, I only found two straggly Camas plants and glimpsed a far off mastodon. We were alone.
Luckily as a survivalist, botanist, and herbalist I assessed and addressed our needs quickly. The animals here weren't afraid of me, or aware that I could throw things. We didn't starve.
Manta is an experienced camper and scored us a spot close enough to the ocean by a river, and within a day's trek to the mounds. We built a serviceable house, a fence against the wolves, started putting food away for the winter, and generally survived for the first couple months.
Then Manta turned to me one night and said, "I want you to get me pregnant."
"Now?"
"I'm mid cycle. Soon."
I wasn't complaining, but Manta had never wanted children before.
"Why?"
"If this is a world without humans - and you and I are here - it's our responsibility to found a culture."
"That's a big responsibility."
She hushed me, "I think we should have babies, as many as we can. Incest is going to be an issue, but if we crossbreed it'll be better. I was looking at the math. I'm going to need you to breed all of our daughters - our sons are going to have to wait until our granddaughters..."
She went on, breeding programs - separating children out by genetic markers like hair and eye color. I was still imagining breeding my daughters.
"Women are the limiting factor here. Assuming that we can get one pregnancy a year and 70% are successful, between 19 and 35 that's an average of 16 babies per female, assume half of those are female - 8 x 16 puts us at a functioning population of 112 by our grandchildren... "
I shut her up by kissing her and then making her pregnant.
We'd had sex before, but never like this. I'd had a lot of kinky sex before - with other women - but staring into her eyes as I pushed into her, both of us working together towards my ejaculation, was the hottest sex I'd ever had in my life. Manta had never been the kind of woman who orgasmed when she felt a man cum, but she started now, and she'd murmur in my ear "Get me pregnant, cum inside me, give me a baby." crooning over and over. I took her three times that night until she was slick with my seed.
After the first time we went back to our favorite position, spooning her from behind. My hand trailed across her thighs, tickling across her clit as she moaned against me, and I buried my cock as deep inside her as I could, again and again. There was no being quiet, not here. I howled, and distantly the wolves joined me, as I took her and claimed her, and spent inside her again, and again. We collapsed into each other, exhausted, kissing and cuddling, breathing hard, until sleep took us both.
She woke me with a hand on my cock. "We have to get as much sperm inside me this week as we can." She said - all cold logic again. I blinked, not sure if I could, but she guided my hand to her, already wet, she'd prepared my way while I slept, and mounted my morning wood, rocking up and down, asking me to get her pregnant again, and it wasn't long before I growled and rolled her over and took her hard, cumming less than a thimble into her.
"How often do you think you can honestly do it?" she asked me, as she lay on her back with her hips up, so that my cum wouldn't trickle out.
"If you asked me to again, I'd probably fake an orgasm." I groaned at her.
"Don't you dare." she snarled. "Really. We need a schedule."
"Three times a day? - if we spaced it out right."
"Okay, I want you back here at lunch for my next sperm injection." She was all business now. "What herbs are good for trace minerals?"
"Bedstraw and Stinging nettle?"
"I'll collect some for you. We can't have the quality of your sperm going down. The primary limiting constituent of sperm is zinc."
At lunchtime, she made me eat the ballsack of the buck I'd killed and brought back, "Full of zinc," she assured me, and then lay back on our bed and did her best pouting sexy face, and spread her legs. It looked a little silly on her, but made me laugh and I dove in, kissing her, and then turning over so I could spoon her, fingering her until she was quivering, and wet, and then slipping into her, nothing gets me harder than an orgasming woman.
It took a while, but she kept murmuring things about babies, and cumming inside her, and if I could get any harder, those words would stiffen me. It wasn't long before I'd plunged as deep as I could and let go my - 8th of a tablespoon?
"When we're not trying to get me pregnant, we're going to have to test and see how much you make three times a day, vs once a day. We don't have a scale, but we can eyeball it," Manta told me when I mentioned it. "My working hypothesis is we get more by doing it more." then she trailed off into sperm quality and how saving up for longer than three days could actually lead to defects.