You know the idea of being kidnapped by aliens to be used as there breeder on there way back to their home planet sounds very hot
(assume reader has boobs or vagina, or is ok with getting them)
Like they're on a massive space ship, chasing after a signal sent to them from earth by a crashed ship. They recover the lost alien, but they talk about how beautiful the population is, and how maybe they could, well take a few with them for a study, a good sizable amount. Some maybe to help and understand humanity, some to test there advance gene science, and for a select few, about how well the two species can mate.
Maybe you drew the short straw, or the long straw. Kidnapped while you were laying in bed, thinking about how the hell you're gonna survive in such a hellish world, that your favorite restaurant closed down, and there's a smell coming from behind your shelf. A beam of light opens your window, and in moments your hovered away into the light, an answer to your prayers, skipping life and going straight to heaven?
In a way yes, surrounded by aliens while you stand in a glass tube. So many different outfits, what you assume to be space suits, the kind they wear when their in rockets and not outside, lab coats, robes, many of them with some sort of tablet and equipment scanning you as they speak together. You focus on them, there like lizard men you wod have seen on those art sites you rather not name, except they were more, colorful to say the least. More neon colors, more nightclub colors, or more like those colorful frogs in the rainforest. Many had horns growing out there head, some did not. Big tails that reached to the ground, or small tails that were almost another appendage. You tried to speak but were ignored, as the bottom of the tube opens and you were whisked away to somewhere new...
It was an odd first few days. They kept putting you on machines to test you. Your old clothes taken away and replaced with what you believe is some sort of sensor suit. You found yourself on a treadmill, a rock face, a big pool, some weightlifting. You tried telling them that you weren't gonna give them the best results, but the language barrier was still there. But the main person behind your test and recording it all was this big lizard...guy(?) and an extremely bottom heavy lizard...lady(?). You wish you brought a entomologist...or was it etymologist, but someone who could at least help you explain things. But the pair was always watching you, testing you, observing you, so much you started to observe them back. The big guy by human standards would probably give football players a run for their money with his size, big enough to be a bed if he could lay down, and he was always gentle getting you off of test equipment. The lady had a huge rear, but no cleavage, but the longer you thought about it why would lizard aliens need boobs, curse your love of sci Fi and boobs for giving you such false hopes. She used her tail like a second hand, it always carried some sort of drink. She was a bit meaner, but she was more hands on with you, almost like she wanted to personally touch you, oh my so many thoughts of these two doing things other then being nerds and writing stuff down, it was already great when they took you from your life, but I mean, wouldn't hurt if they let your dreams become even more real...
it's been about 2 weeks since you were taken, at least by the clock they gave you that changed it's date every so often. You were watching what you assume it's space NASCAR, cleaning up after eating your afternoon meal of thing that's like chicken and thing that's like vegetables and rice. They managed to figure out the whole speech thing, some trouble with it still, but enough to hold a decent conversation. But your chamber opens, and you wait for your afternoon test-
They're naked, the two of them. Did you fall asleep and have that dream again, no pinching yourself shows you're still awake, and that reality was better then dream. They approached you, and the air escaped from your sensor suit as it unbounded it self from you like many times before. They held a tablet to you, and shows you an animation, of people having sex. They switch it too be the alien lizard people and you having sex. They explain that the next test is to see how compatible you and they were, with the big guy using his, very large knot that you couldn't stop staring at, and the bottom heavy lady would be observing and exploring your body as well, since the sensor suit can't be damage.
You checked again if you were dreaming, nope still awake, but now your dream is in reality. You try and not go crazy with accepting, but your frantic escaping from your loose suit was enough to tell them otherwise. It wasn't long till you were spread out on the bed, and big dude was there, with his um, "knot" erect, looking like those dragon ones you always wanted, as the lizard lady prepares her tablet. A good amount of lube spread on the knot, and a tip insert and you're already cumming after 2 weeks of nothing. He's going deeper, and deeper, and deeper. It feels amazing, did they put something in the lube? He started thrusting as a steady rate, in and out, in and out, you were enjoying every second of it. You looked over to see the lady trying to focus and write knots, but her legs were crossed, and she let out an audible "hmph" after a bit, and went to grab your boobs. She tried to make excuse of "we want to see just how your mammories act during sex" or "this is just to understand them better" but you know she's been wanting to grab them for so long, groping and squeezing them, she even tries to milk them, and you try to get out you can't make milk, but all that comes out is nonsense, which she silences quickly with a kiss from her snout, and a long lizard tongue fighting with yours. You heard big dude start to speak after so long, and says it's time, as you suddenly feel a warm blast of cum fill you, as the cock expands to fill the space. Spurt, spurt, spurt, so much you get a little bulge in your belly. So much things happening, you were left mumbling from it all, as the lady kept playing with your body, now using her hands to explore you in more depth, to see how your body reacted, the cool hands exploring each and every inch of you till the knot goes down...
It was like this for a couple weeks, perhaps it was the pair that used you, you even got plenty of time eating the lady out, she really loved that, even sneaking in to "study" you by herself more as the two of you explored one another. Sometimes it was a different scientist, sometimes a guard, all manner of people came and went for a few weeks, trying to breed you. But all it made was a mess and your mind friend for a few minutes from it all. When no results came in, they approached you about doing some gene editing, the amount of data they collected would allow a more compatible change, at the cost of you laying eggs now, but a slight change should give better results in making you two compatible. They mention as well that any milk you would produce wouldn't be very nutritious, but a few changes and you'll be making highly nutritious and healthy milk. You agreed of course, if it means more fun, beside you always had a thing for eggs.
It was a weird thing, you were stuck floating in liquid, a mask over your face, something attached to your nipples, something being injected into your breasts, you could feel something in your cunt, like a dildo along with a cover, it felt like it was doing something, you weren't sure what, everything felt hazy. All you could think about was the eggs and milk...
You emerged... different to say the least. Your nipples had changed from a pink hue to a more neon blue, and instead of a white substance a blue tangy liquid came out. Your cunt had the biggest change, it kept it shape somewhat, but you could see some alien lizard DNA on it, and your inside felt very different. You rested for a few days, no sex which sucked, but they gave you plenty of food and entertainment. But the day finally arrived to test out your new changed parts, with the pair of scientists of course, and much like before one pounded you away, and the lady exploring your body, but this time drinking from your nipple, and drinking a lot that you joked there won't any left for the eggs. But as the big dude came, it felt... different. It felt much warmer, and heavier. The belly bulge of cum stayed, but it didn't go down very much as the day progressed, not helped by them coming in to breed you over and over to ensure you get pregnant, but atleast had two hungry mouths to drink from you. But as the days progressed your belly size didn't go down, frankly it got bigger, and bigger, heavier and heavier. Eggs comfired by the end of the month, but gestating at a lower rate then the alien lizards. So many days of feeling them grow and grow, and by the 5th month you looked pregnant like you were ready to give birth. Which soon arrived, as your mating pair held your hand as the first egg came out, then another, then another, about 6 in total, about the size of baseball, some as big as a grapefruit. A big clutch, all yours.
And this was your life from then on, spending quality time with the crew, and spending "quality time" with the crew in bed. The clutches came out nicely, and the things that emerged where more alien lizard, but some human features started to arise, like hair, and nipples. Only time would tell what the consequences of all this, but you just enjoy getting bred and filed with alien jizz, and laying egg after egg, and getting milked by all your new friends...