His penis felt all tingly and achy with need. With it throbbingly erect and buried deep inside her passage, one squirt and he’d make her a mommy. “So weird...” he said engrossedly, looking at this filly who just... swallowed his penis inside her.
“Y-yeah, but it’s not like you can’t pull out. T-that’s just silly.”
“I know,” he said a little more passionately than he intended, his hips stirring with unconscious small thrusts, “It’s not gonna make me want to... to put a baby in your belly.”
“K-kinda weird to think about,” she said, a little worried at his easy thrusts, what they were doing to her. “I mean, I can feel you... sliding up in there. It feels... good.”
His thrusts gained power, as he started breathing harder, saying, “Yeah it feels really good. I—I guess this is what makes me ejaculate.”
“You feel like your... penis is gonna squirt in there?” she said, eyes half closing from the rich tingles of being stretched and filled.
“Not... not yet,” he said, grinding close and stopping his thrusts with effort. Both breathing hard now, they stared at each other, wide-eyed. “We should stop,” he said, suddenly worried.
“Y-yeah it’s really...” she didn’t know how to answer, and he slid in and out once, making her sigh, “Making me feel f-funny...”
“I... I’m thinking about squirting,” he said tensely, starting to thrust again, bracing above her, “A-about what it would do. To you.”
“Y-yoou don’t wanna do it though,” she panted, “You’re not really a b-boy, you’re my friend.”
“I’m a...” he slid in and out, “I’m. a...” then he hugged her close, and both their groins exploded with pleasure as he started thrusting into her hard. “I am a boy,” he groaned, “I... I... I have a penis. It’s inside... oh it’s going inside you!”
“You’re gonna... squirt!” she gasped, unable to even think about pushing him away. Hugging close to this thrusting boy, she cried, “You want to do it! You can’t... stop!”
His answer was to fuck her, hips rolling against and into hers with an ancient, primal rhythm that just seemed so right. All he could think about was where his penis was, and how much he wanted to do this. It just felt better and better. He tried to stop, but the urge surged in him, and he just kept fucking her hard, as the tingling in his penis grew and grew.
He humped in her like an animal, until the tingle started to catch. It just... stopped going down. Every thrust made it tingle more and more. “Oh it’s... soooo I think it’s gonna—hahh...hahh!”
“Nnf... you have to...” she whined, as he shoved his hips desperately against hers, feeling his penis twitching deeply in that amazing wet heat. Into those clutches, he cried out as everything just started... convulsing down there. Sucking in deep breaths, he couldn’t deal with the rushing tingles as he felt his penis flexing, pumping, and something rushing through it, and out.
“I can’t—” he said as he eagerly squirted, “I can’t pull... out... gotta... gotta fill
you.”
“Oh, more,” she moaned senselessly, as impregnated as she could possibly be.
He just moaned and clutched her close as an especially strong spurt from his penis flooded right into her womb.
...
“Oh heck that was...” he panted, hunched over her, “I couldn’t... stop. I just... put a baby in you. Are you...”
“I can’t stop, either!” she squealed anxiously, as that gooey stuff did things in her she could hardly comprehend. “I think my egg’s gonna... I can’t st–stop!”
He tried pulling out of her, but it was no good. She writhed there, covering her drooling cunny with a hoof, trying to hold down the urge, but it built in her and built in her. “Your stuff is gonna change me!” she cried fearfully, at the waves of pleasure growing in her groin. “I have to... h-help...!”
He tried. He even tried pulling her hoof away, saying, “I’ll get it out! Just hold on...” but the moment his tongue started to penetrate her, she moaned and lost it. Her legs kicked out in rhythmic twitches as she hitched in short breaths, her insides rippling and flexing around that seed. Within her, the egg erupted thorougly and totally, and all she could do was lay there staring up at him fearfully, lovingly, as her body flooded with the pleasure of becoming pregnant.
“I...” was her first word, as the pleasure started to finally release her. “I...” she repeated, staring at her own groin, then up to him. “I just... had to... it just happened to me,” she said faintly. “I didn’t mean to.”
“N-neither did I,” he said mutedly, “You just... that was incredible. You couldn’t stop it. It just happened to you. I just... did it to you.”
“I—I can’t be pregnant,” she whimpered, “I just... I just got so full of your seed it wouldn’t stop... sliming in there. And it... it changed me until I had to... to get pregnant.”