Lust Garden

At first, it might move into the basement or attic. You won’t notice it’s there until it decides to enjoy its new toy for the first time. Emerging from its hiding place to pin you down. Mercilessly thrusting and cumming into you without a second thought to your pain or fear. When it’s finally satisfied, it leaves you a cum-stuffed exhausted mess as it slinks back to where it came from. And this is only the first time of many.

Whenever you’re home, you anticipate to be grabbed, fucked, and stuffed at any point no matter what you might be doing at the time, even if you’re trying to sleep. The monster eventually grows bolder, too. It moves out of the basement/attic, maybe sleeping in your living room or even the bedroom with you. Fortunately it has no interest in your belongings, just you and your house. So you get to continue with your day to day life, if only constantly sore from the monster having its fun all the time

Well, until you get pregnant, that is. Maybe you don’t think this was a possibility since you’re entirely different species, but soon enough you can’t ignore the squirming in your swollen belly. The babies quickly grow huge and heavy, and going out in public gets unreasonably hard, hauling around your belly full of inhuman creatures as people stare. Soon enough you can’t even leave the house at all. Barely able to move from the bathroom to the kitchen as the monster’s offspring thrash and fight for more room that your stretched and strained belly can’t give. Each of them are already bigger than a human fetus, and there’s so many of them.

The monster’s behavior changed too, constantly attending to its babies. Not you, just its babies. Constantly licking and caressing your overtaxed belly and feeling its offspring move. You’re too exhausted to push it away, barely able to do much other than groan and whine in bed as the monster licks your swollen belly. And soon after you give birth, it’s back to normal. Fucked and filled constantly, but now with the knowledge that it actually can impregnate you.

you're some adventurer or hero coming to the end of your main quest, only for the villain to defeat you and make you/the rest of your teammates into their personal whores.

or you all get defeated by some monsters and get used as incubators for them.

Anyway she and the alien fucked me and then she pulled away but the alien stayed in me and then she came back with a wayyy bigger strap that was like fleshy and oozey and she was like. This will pump the eggs into the tentacle and she'll fertilize them and pump them into you.

And I could feel the way the tentacle stretched around the ovidepositior. And I could feel the eggs going into the tentacle and stretching her out even more.

And then I woke up before any of us could finish and now I can't stop thinking about a like fleshlight dildo combo. That may or may not be a sentient egg laying alien.