It was great. She was here, he was ready, and I was gonna get away with murder. Of course I had his foal in me at the time. Little Windstorm enthusiastically pumped his semen into my cunt as I held him and told him what a good job he was doing. He definitely had enough to impregnate somepony, and he was totally into it. Every time I babysat, we’d go up into his room, and get him mounted on me right away. I had to lay on his bed of course, but the colt didn’t mind, and was soon lustily thrusting away like he was born to be inside me.

He didn’t ejaculate at first, just had a look of unparalleled wonder as his adorable dick started pulsing inside me. “What was…?” he said looking down at me in absolute amazement.

“That happens to you every time you do this,” I told him in drunken pleasure, “I’ll let you do it whenever you want. Just thrust your penis in me until it happens again.”

“A-again? That felt really …good!” he said hopefully, sliding right out of my wet pussy.

“Give it a rest,” I told him, “When you start feeling achy for it again, let me know and we’ll get you thrusting in me right away.”

After the third time, he hugged my torso with his nose buried in my chest fur as his hips humped deep and throb, throb, throbbed in there. “You’re the best babysitter ever,” he said with a happy sigh.

“I know,” I told him smugly, “So wanna go play video games now.”

His ejaculation started to pick up, thrillingly. He tensed as he started spurting into me with strong jerks of his penis, then said “S-something came out!”

“You’re making semen now,” I told him with a rush of lust in my heart. “Your penis squirted semen right up into my vagina.”

“I-is that good?” he asked uncertainly.

“Yeah,” I told him, “I’m gonna keep your semen inside me now, all day, until you’re ready to put more into me. That’s why your penis jerks, because it’s trying to pump semen into me. And now you’re old enough that you can.”

He pumped more and more semen into me over the year. I showed him once, having him pull out, and licking my own vaginal juices off his surprisingly large erection, until the colt climaxed, and ropes of white seed shot out of his penis. “That’s what you’re putting into me,” I told the climaxing colt, letting the semen land right on top of me. “Every time you do it.”

“I… I wanna pump it all out my…” he said lustily, flexing his penis against my cheek. “Ohh, I wish I could do more!” he exclaimed, frustrated.

“Just give it a rest, your body needs to make more semen first,” I told him in amusement, “When you start wanting to put it in a filly again, that means you’re ready, and next time you can squirt every drop into me.”

“I… I wanna,” he said dizzily, hugging against me.

So he was thoroughly ready to have sex, and when I didn’t go into estrus that year, I knew exactly what I was gonna do.

“Pleased to meet you Teadrop,” I told the little pegasus filly, well, not too little. She was smelling of estrus, her very first, and she wasn’t even supposed to leave her house. Fucking assholes of parents didn’t want to stop her from doing what’s natural. Well, I wasn’t gonna do what’s natural either, but I wasn’t gonna stop them. I was gonna start them. “I’m Candy Kiss, Windstorm’s babysitter, and I let him get away with all sorts of naughty but fun things.”

“Like what?” she asked, ear quirked in attention.

“Like this,” I said, laying back and spreading my legs. “Have you ever touched your fillyhood before?” I start rubbing a sensuous hoof between my legs as she stares, big-eyed.

“You haven’t, huh?” I ask slyly, as she blinks and blurts out,

“N-no. We’re not supposed to touch there.”

“Well I’m touching there,” I tell her teasingly, “And you can too if you want, you won’t get in trouble. It feels really good.”

She doesn’t last long. Soon she’s there, rubbing herself just like I am. “I think it does feel good!” she exclaims in surprise. “It’s all tingly.”

“Great!” I reply, looking between her soft blue furred legs with interest, “Are you getting wet down there, yet?”

“I… uh” she says, lifting her hoof and looking at it, “Yeah, I guess…?”

She goes back to rubbing herself as I say, “Fillies start to get wet down there. Your body’s making a special fluid that starts coming out of you a little. It’s really slippery. Feels kind of like you’re melting inside.”

“Y-yeah, wow… I think it’s coming out of me,” she says in shock.

“Well, keep at it, and I’m gonna go get Windstream, so you can use your wetness to make him feel good too,” I tell her, as the filly blushes and starts to close her legs.

“Don’t worry, he knows all about this stuff,” I assure her, “Let’s all get together and just touch ourselves.”

I have to lead again, but soon Windstream and Teadrop are both caught up in masturbating. “Keep touching yourself,” I urge her, “But look, his penis is coming out.”

“It… wow it is,” Teadrop says distantly, looking at the colt’s swelling erection, “Are you gonna pee, Windstream?”

“No, it’s for something else,” I tell her before he speaks, “Just watch, and see what happens to his penis.

After a while, Teadrop huffs, “Wow, it’s getting… really big,” staring at that colt’s penis while humping against her own hoof.

“I wanna put it in, miss Kiss,” Windstream whines, erection straining against his crooked hoof.

“I think you two are ready,” I announce, “Stand up, Teadrop. This is gonna be awesome.”

She does, looking up at me, and I say, “Point your butt right at Windstream and turn your tail aside. Really show him what you’ve been touching.”

“But I don’t have a penis or anything,” She says uncertainly.

“You have a vagina,” I tell her, “It doesn’t stick out, but he still thinks it’s really beautiful. Right Windstream?”

“Yeah I… I like vaginas!” he says eagerly, standing himself as his erection bobs underneath him.

Teadrop presents for him, and looks back cooing nervously, “Y-you like this, huh?”

“Yeah,” he says, staring fascinated at it. “I’m gonna…”

“Go ahead, Windstream,” I tell him amiably, “Just like we practiced.”

As he grabs and mounts the surprised Teadrop, I tell her, “He really wants to do this. Boys love getting up on your rump like that.”

“I-it’s okay?” she asks anxiously, looking at me with a solid blush.

“You look beautiful right now,” I tell her, “The best most wonderful fillies let a colt hold their butt like this. You’re doing a really good job.”

“Just… stand here?” she asks lamely, “He’s—” her eyes narrow.

“That’s his penis,” I tell her smugly, “It fits right against you back there, doesn’t it?”

“It… he’s gonna rub me with it?” she asks, staring forward distantly, “He’s really rubbing it and… w-wait…” The filly gives these cute little choked gasps as Windstream penetrates her. He starts fucking her right away, as I tell her,

“Feels good, doesn’t it? That’s a penis sliding in and out of you. See why you had to get wet, now? You’re nice and slippery inside. And really hot.”

“I… I… this is… okay?” she asks rocking back against the thrusting.

“Just enjoy, filly,” I tell her frankly, “You don’t wanna do anything other than let him thrust his penis in you now. He feels the same way. He’s gonna keep pushing it deep, and he’s not gonna stop.”

“He’s… not… gonna…” her words fall to a moan, as she stares forward, mating with him like the animals they’ve become.

She looks back in surprise when he hauls up into her and suddenly stops, but only a moment, before she snaps to staring forward again, sucking in astonished breaths.

“How do you like Windjammer’s semen?” I ask her happily, “It’s coming out of the tip of his penis right now, squirting deep into you.”

“It’s… hot and… ungh…” the lust-ridden filly pushes her rump up against Windjammers, as his seed starts to leak out of her little cunny and puddle between her legs on the floor.

“You’re full of semen now,” I tell her eagerly, “He squirted it into your vagina, and way up into your womb.”

“D-deep… he squirted it deep!” the filly gasps.

“That’s not even the best part,” I say smugly, “He’s gonna finish you now with his tongue.”

She looks confused at that, as Windjammer dismounts, stammering, “I-I swear I like it. Your b-bottom is a thing colts like a-and I’m a colt so don’t worry oh my semen’s coming…” he stares between the filly’s legs, “Out of you…”

Then Teadrop gets to stand there gasping in shock as her new coltfriend pushes his own semen back in, stimulating the filly more and more, until she cries out in purest utter delight, “I love your semen inside me, Windjammer!”

“He feels like this too,” I say grabbing her attention again, “It just builds and builds higher until it fills him up like lightning and then he explodes. Can you feel that happening to you?”

“I… I…” she pants, staring forward with half lidded eyes.

“When it happens to him, that’s when he starts putting semen into you. The semen starts squirting out of his penis, over and over, and he can’t stop doing it. How do you think it’s gonna happen to you?”

“I… I don’t… hunh it keeps… getting bigger~!” she whines in distress.

“It’s okay filly, just…” I say, stroking her mane and getting nose to nose with her, “Let it happen. "How is it feeling right now?”

“I can’t it’s… bigger and… it’s so tingly my whole… body I…” she says, gulping in air, “It’s… filling me up! I—I can’t…! I…!”

“It’s happening to you, huh?” I ask the filly whose pupils are shrinking in shock, “Filling you up with lightning. You feel like you’re gonna do something, like something’s gonna happen. Then… you can’t stop.”

She squeals in surprise as her orgasm hits, shuddering in place as her cunny starts rhythmically clenching. I lay my head over hers, the orgasming filly’s skin hot against mine, as she gasps, “Thank you…! Oh… thank you… oh…”

You better bet that eleven months later, she’s squeezing his foal out her cunt with her gigantic belly.