She was already dripping when she pulled up the pregnancy porn on her phone. "Fuck, look at that belly," she said, shoving the screen at me. Her hand was down her shorts, fingers working her clit like she was starving for it. "I want that. I want you to pump me full until I'm huge and leaking."
I didn't need more invitation. I yanked her shorts off, spread her thighs, and slammed my cock into her wet cunt in one hard thrust. She moaned like a whore, legs locking around me. "Breed me," she begged, "fill that pussy up." I fucked her rough, balls slapping her ass, telling her exactly what I'd do: shoot thick ropes of cum deep in her womb, knock her up, make her tits swell and her belly round out so everyone knew she'd been used.
She came hard on my dick, pussy clenching, and I buried myself to the hilt and unloaded. Pulse after pulse of hot cum flooded her. We didn't stop there. Every night for weeks I bent her over, pinned her down, or fucked her on her back with her legs up so none of my load could leak out. She watched those pregnancy videos while I railed her, rubbing her clit and describing how her body would change.
It took. Two months later her tits were sore and bigger, her belly starting to push out. The first time I fucked her pregnant, she was on all fours, belly hanging low. I grabbed her hips and drove in deep. Her pussy felt hotter, tighter around my cock. "Harder," she grunted. "Fuck your pregnant slut." I slapped her ass and pounded her, watching the way her swollen belly swayed with every thrust. When I came I stayed inside, grinding my cum against her cervix while she rubbed her belly and came again.
By the fifth month she was massive. Her belly was tight and round, skin stretched shiny, veins showing. Her tits leaked milk at the slightest touch. We turned it into our new routine. She'd sit on the edge of the bed, legs spread, belly resting on her thighs, and I'd kneel and eat her out while she watched pregnancy porn. Then I'd stand up, slap my cock against her swollen lips, and sink into her. The angle was different now; her belly forced me to fuck her from behind or with her on top, riding me slow and heavy, hands cradling her stomach.
She loved when I talked dirty about it. "Look at this belly I gave you," I'd growl, running my hands over the taut skin while my cock stretched her cunt. "Everyone's gonna know I bred you like an animal." She'd moan and bounce harder, milk dripping from her nipples onto my chest.

Sometimes I'd lean up and suck her tits, drinking the sweet milk while I thrust up into her.
One night she was on her back, knees pushed to her chest as far as the belly would allow. Her pussy was puffy and glistening, belly huge above it. I slid in slow, watching my cock disappear into her. "Deeper," she demanded. I bottomed out and stayed there, grinding, feeling the pressure of her womb. We fucked like that for a long time, raw and filthy, sweat and milk and cum mixing. When I finally came she screamed, her whole body shaking, belly contracting visibly as another orgasm ripped through her.
Afterward she lay there, legs still spread, my cum leaking out of her used hole and running down her ass. She rubbed her belly in slow circles, smiling. "Keep watching those stories," she said. "Next time I want twins." I was already getting hard again. I rolled her onto her side, lifted one thick thigh, and slid back inside her pregnant cunt. We didn't need the videos anymore. Her body was the story now, and I intended to keep adding chapters until she was completely, thoroughly bred.