Dinky Doo's Big Adventure

“G'morning, kiddo.”

“Urgh.” Dinky rubbed her head. “How long was I out?”

“Only twenty minutes or so. Enough for me to clean you up a bit. Your shirt's a write-off, but I did manage to mostly tidy up your room. Had to replace the sheets, but the rest was easy. And delicious.”

“Ew.”

Carrot Top grinned. “Kidding, kidding. So, you doing okay?”

“I came so hard I passed out, how do you think I'm doing?” She leaned back in the tub, her body glistening with residual moisture – along with some droplets of pre from the head of her still rock-hard cock. Almost as big as her mother's, Top mused.

“Shit, kid, it ain't all that weird! I mean, spend your whole life never having sex of any kind and then you cum that much in one sitting? Fuck, anyone would pass out there.”

Dinky stared sullenly at her member. “Yeah, sure.”

Carrot Top tossed Dinky a strip of fabric on a coat hanger. “I've set up the hot tub for you. Go on, you could use the break. And it'll help you keep your mind off of it. I even gotcha a brand new swimsuit. One of those sling bikini thingies, which you will kill in by the way. 'Specially with your dick.”

Dinky rolled her eyes. Another expensive gift, completely unprompted, as usual. “How do you even have the money for all this random impulse buying you do?” she had asked once, ages ago. “I've never seen you work a day in your life.”

Carrot Top waggled her eyebrows. “You'd be surprised how much money you can make bottling all the spare cum your mom makes when we fuck, mixing it with some of my breast milk, and then selling it at a premium as an aphrodisiac.”

“Ew!”

“That's your college fund you're ewing, Dinks. Also our house that's bigger than four rooms. And a new hot tub. And literally all of the bikinis.”

In the present, Dinky decided that it would be wise not to comment. She grunted. “Thanks, I guess.”

“Now, if you'll excuse me, I gotta go see Doctor Horse about the fact that your cock seems to have doubled in size after your little escapade with Twist.” Her usual shit-eating grin softened with worry. “That's probably bad, and your mom'd kill me if I didn't see the doctor about it.”

“Twist said this was normal...”

“Yeah, spoilers, it isn't. At least not in this case.” Carrot Top's brow furrowed deeply. “I mean, cocks growin'? That happens sometimes. But stayin' grown, 'specially for this long? That ain't normal. And anyway,” she said, turning to leave the room, “this is new information. Who knows? It could help him figure out exactly what's goin' on here and how to fix it.”

Dinky groaned, stretching her still tired body as Carrot Top left. “That'd be good. I guess.” Of course, Carrot Top was already gone at that point, so Dinky was largely talking to herself. Not that she minded. She looked down, frowning. “Celestia knows I'd like to be rid of you.” It was probably preferable that she was talking to her penis while no one else was around. “Go the fuck away, you stupid thing! At least go down!”

No response other than a slight jerking and another sputter of precum.

“Yeah, sure. You're the result of a miscast. I totally subconsciously want a giant fucking penis that's totally ruined my life, doesn’t get soft, ever and is getting bigger. Who the fuck wouldn't!?” She shoved herself upright, leaving the tub.

“And of course Twist is gonna tell fucking everybody,” she muttered sullenly. She knew that she could trust Noi to be discreet about her new appendage, but Twist? Wherever it was Twist had to go ‘real quick,’ Dinky had the uncomfortable feeling that she was decidedly not going to ‘love it’.

Dinky decided that she didn't really want to continue that line of thought. There were many places a topless, cum-inflated, breast-expanded Twist might have run off to in that kind of hurry, but she wanted to consider the implications of exactly none of them. Instead, she turned her attention to her new sling bikini. “Yeah...” It was about what Dinky expected from a swimsuit picked out for her by Carrot Top. It was midnight black, and felt amazingly smooth and silky to the touch. And, unsurprisingly, there was hardly anything to it. It widened slightly at the crotch and nipples, but only barely enough to not qualify as dental floss. The rest of it did qualify as dental floss, as far as Dinky was concerned. Still, the fabric shimmered, catching the dim bathroom lights like the scales of a tropical fish. It was, she mused, almost certainly enchanted – every swimsuit Carrot Top owned was. At minimum they all had a one-size-fits-all spell woven into the material.

And it smelt faintly of lilac. “I suppose,” she mused out loud, “it's better than nothing.” None of her other swimsuits would fit with the behemoth between her legs, and if she was going to be going into the hot tub, she figured it would be better not to do so completely naked. She shrugged and made the brief journey to the extension where the hot tub was located. The walls were almost entirely glass, allowing anyone who wanted to look in and see her. But it was also located in the rear of the house, which was already on the outskirts of town, so Dinky wasn't particularly worried about being spied on. The one wall that wasn't made of glass – the one attached to the house proper – was instead a giant mirror, put there entirely for Carrot Top to admire herself in. Dinky pointedly avoided looking at herself in it as she slipped the bikini on.

It was easy enough to slip on. Legs through holes and then pull it up and over the shoulders. There was nothing for her dong to get in the way of, so she could actually somewhat comfortably wear it. Though she'd have preferred something much more modest, this would have to do. As it was, it hardly even counted as clothing. Even her modest breasts, a trait she'd inherited from her mother, strained the fabric. It was, she mused, probably designed specifically to do that. As for the bottom, well, even if the swimsuit's skimpiness wasn't magically enhanced, there was no hope of it containing her baseball-sized testicles. They bulged from either side of the skimpy fabric, tightly outlined before plunging behind her and sinking into her ample ass.

She idly rubbed her rear a bit while completely failing to avoid looking at herself in the mirror. She couldn’t help it. She'd inherited her figure from her mother, which meant that she was very bottom-heavy. A soft, squeezable ass and wide, motherly hips that she found herself caressing with one hand as the other idly gave her balls a squeeze. They were almost comical on her feminine frame; huge and fertile and manly, and to top it all off they were attached to an equally huge and fertile and manly cock. Long and thick and dark, throbbing with a deep, aching need that she was suddenly having a very hard time resisting.

“... If having sex makes it bigger, maybe masturbating makes it go down,” she lied to herself.

She slowly slipped into the tub, sighing as the heat of the water soothed her sore body and sent electric tingles of arousal down her spine. “Mmmmmmmyeah that feels good,” she muttered, hands exploring her body. It felt good to just let go, to put aside all her reluctance and just enjoy herself. Her penis was so sensitive that just entering the tub had cause it to spew thick gouts of pre with redoubled intensity, but actually touching it was heavenly. She firmly grasped the dark shaft with one hand, woefully inadequate for masturbation, but she had magic to make up the difference. Her horn lit, and the base of her cock was enveloped in her golden glow, slowly stroking and squeezing while her other hand was free to wander behind her ballsack and give her lady parts some much needed attention. She groaned, gently rubbing her damp slit. She hadn't noticed until now, but her cunt was as aching with just as much need, and she was finally giving it the attention it needed. Firsthand, not from an outside source. And it felt good.

Really, really good.

Her horn sparked, a shower of gold flying everywhere as she felt herself approaching the edge. “Fuck!” Her ministrations became stiff and jerky as her hips quivered, weakly thrusting into her masturbation. She was so close already, just a little bit more and-

Somepony roughly grabbed her arms from behind, yanking them away from her body and pulling her out of the tub and onto the heated tile surrounding it.

“I don't think so, slut.” A pink-furred foot pressed down onto her member, firmly and roughly. “If you think I'm going to let you waste all that cum just masturbating, you've got another thing coming. Hold her, Silver.”

Diamond Tiara licked her lips, a predatory grin playing across her face. “I wanna see if I can take the whole thing.”

Dinky opened her mouth to object, but all that came out was a low moan as Tiara ground her foot against her cock. “Don't even bother. I know what you're gonna say, and it's all bullshit and you know it. Here you are, jerking your two foot horsecock off while wearing fucking dental floss in a big fucking glass room where anypony could see you. Your door wasn't even fucking locked! I don't care what flimsy justification you use, you clearly wanted this.” She pressed down sharply, drawing a gasp and another geyser of pre from Dinky. “And anyway, you didn't really object to the titfuck and blowjob Twist gave you. 'least that's how she tells it.”

“Hi, Dinky~ Told you that you'd love thith!”

Dinky let out an exasperated groan that very quickly turned into a lustful moan as Tiara ground her foot one last time before removing it. “Look, if you're still uncomfortable after I'm done, I'll pay you whatever damages you'd get from a lawsuit anyway.” She deftly removed her clothing in a series of practised, fluid movements. “I mean, you won't be, but the offer's on the table. Either way,” she grabbed Dinky's meat firmly, carefully positioning it beneath her waiting fuckhole, “if you think I'm passing up the opportunity to fuck a cock that grows a good five inches every single time it cums, you've got another thing coming, slut.”

“Sorry about this,” Silver Spoon said, her voice low enough that only Dinky could hear her. “She gets like this sometimes. I tried to stop her, but she has trouble grasping that rape is bad? If it helps, she's not lying about paying you off.”

“Thanks,” Dinky grunted. “That really puts my fucking mind at eaaaaaaaaaaaaafuck,” her train of thought was interrupted by Tiara suddenly plunging down, going straight to the hilt in one go with far more ease than should have been physically possible.

“Ngggg yeah, that's fuckin' good,” Tiara grunted, cupping her ample breasts – not as large as Twist's, but easily rivalling Noi's, mostly due to natural magical enhancements. She tweaked her pierced nipples, tugging on the silvery barbells. “You like 'em? They're magic. Let me take anything without ever losing my perfect tightness.”

Tiara wasn't lying. Her cunt was like a goddamn vice, squeezing and milking her cock, putting pressure on all of the most sensitive spots with the practised ease of an experienced slut. “Not that I needed them. You're not even as big as Silver -”

“Yet,” Silver purred, gently licking Dinky's cheek.

“I mean, look at this bulge. Practically nothing.” Dinky stared in awe at the perfect outline of her cock, pushing and distorting Tiara's otherwise perfect abs, all the way up to between her ribcage. Dinky swallowed heavily as she processed the implication of this being “nothing” for her. “Anyway, you'd better hurry up and cum, slut. At this rate we'll be here for a week before I'm even slightly satisfied. Silver! Twist!” she shouted, grabbing Dinky's arms and pulling her upright before cooperating with Silver to pull her into a tight embrace, their breasts pressing firmly together. She felt the cold metal of Tiara's piercings digging into her smaller breasts. She could also feel Sliver's cock, pressing firmly into her back as the larger mare held her arms behind Tiara. More cold metal pressed into her spine, a series of icy points sending sparks of arousal through her body and sparks of gold sputtering from her horn.

“It's called a frenum ladder. And yeah, 's also enchanted. Same one as Tiara's just in reverse. Hope you like the idea of twenty four inches of cock up your ass because that's what you're getting.” She casually lifted Dinky and Tiara as she stood, and then lifted them higher (with some assistance from Twist.)

“W-what, no! Wait!” Dinky shouted, her voice tinged with arousal and panic as Silver moved one hand to steady her cock while Twist manoeuvred her grip to pull her legs up above her head, spreading her asscheeks wide.

“Too late, slut,” Tiara purred into her ear. “Just relax or it'll hurt. Silver, go.”

Dinky screamed as she plunged, her heart sinking into the pit of her stomach like she was on a roller coaster. And then all sensation was gone, her mind consumed by the tightness of Tiara's pussy, the impossible fullness of Silver's two foot behemoth in her ass, the pressure of Tiara's nipple piercings against her breasts, of her own bulge pushing its way through Tiara's body to dig into the bulge Silver had produced in her. “Fffffffuckkkkkkkkk cummmingggggg!” Her horn erupted with a shower of golden light in conjunction with her cock erupting with copious amounts of semen. She struggled and squirmed, but despite her slight frame, Silver's grip was like iron, leaving Dinky unable to thrust or even actively participate. All she could do was groan as Tiara pulled herself up and down her cock while Silver lifted and then dropped her, leaving Twist to eagerly grope at her plush ass and leaking cunt, the three of them milking orgasm after orgasm after mind-blowing orgasm from her.

Slowly her body was pushed away from Tiara's, between her expanding bulge and Tiara's own swelling gut as more and more semen surged inside of her. “Ghaaaaa!” Her horn erupted again, the golden sparks shooting high into the air before gently floating downwards, settling on the gangbang below.

“Gnnn cumminggg!” Silver groaned.

“Woah hey what-”

Silver's strength gave out as her orgasm hit, and Twist wasn't nearly strong enough to support the weight of three other ponies, causing them to topple over into the hot tub. The bubbling in the water intensified as it slowly turned an opaque cream, then died down as, one by one, four mares spewed forth, panting and coughing and struggling to get their breath back.

“Ow.”

“Fuck.”

“Thith wath a thtupid idea in retrothpect.”

“That was awesome! Let's do it again!”

“What.”

“No.”

Tiara grinned like a madmare. “Well, I mean, so next time we do it somewhere a little more stable and not next to a pool. Everything else was fucking amazing!” She rubbed her gravid belly. “Fuckin' look at me! This is easily in the top five biggest cumshots I've taken!”

Dinky stared in disbelief. “Bullshit.”

“I feel like I can still mostly move about on my own,” Tiara said, caressing the gurgling bulge of her belly, easily big enough to fit several infants inside. “But still. Damn.” She grinned. “Feeling your cock grow bigger inside me totally makes up for the lack 'a volume.”

“I'm not sure whether I should feel insulted by that or not,” Dinky grumbled, blushing and looking down at her decidedly past two feet horsecock, still erect as ever.

“Well,” Silver interjected while Twist eagerly got to fondling Tiara's cum-inflated belly, “did you at least enjoy yourself?”

“No,” Dinky lied.

“So you don't wanna go again, then?” Silver grinned, grasping her own jet black and still very erect cock.

“... no.” Dinky blushed. “I mean yes. I mean... fuck, you know what I mean.”

There was a gurgling noise.

“I won't tell anypony, don't worry.”

“Hey, uh, guyth?”

The gurgling intensified.

“Tell you what, help me clean all the cum out of the hot tub and we're even.”

“Guyth?”

“Yeah, okay, deal. I feel like I owe you considering it's partially my mess.”

“Guyth!” Silver and Dinky snapped out of their conversation with varying levels of irritation.

“Shut up, Twist! Did I give you permission to speak?” Silver spat. “Your stupid fucking lisp pisses me... off...” her tirade trailed off as she noticed Diamond Tiara.

And the source of the loud, wet squelching noises. Tiara squirmed and writhed, lying prone on the ground as, slowly but noticeably, her belly began to shrink, accompanied by a soundtrack of upset stomach noises.

“Ghhhnnnnnng fuuuuUUUCK! Haaaaaaaahhhhhh~” Tiara's hands furiously pawed at her convulsing cunt, her hips bucking wildly as fluids spewed and stomachs groaned and shrank, until it all culminated in a loud, wet, cum-scented belch as Tiara's gut finally returned to its normal size and shape. She collapsed into a quivering puddle, panting heavily. There was a minute of stunned silence that Tiara eventually broke; “What the fuck was thaaaaaaaaAAAAAA!” There was a flash of golden light as Tiara thrust her hips in the air, gout after gout of thick cum spewing from her new ten inch, deep lavender member.