Wants and Needs

“hey, silver! just got a really great gift, figured you'd want a taste. mind if i pop over for a few hours?”

Silver's answer didn't particularly matter – she knew from experience that Tiara would show up regardless of her reply. The text was less about asking if Silver would mind a visit from her PFF and more a warning that her PFF was coming over whether she liked it or not. Still, it was only polite to quickly shoot back a response; “yeah sure i don't have any plans anyway.” No one did, really – the fact that they had the day off was something of a surprise. There had been a lot of unpleasant surprises today, really, and Silver very much wanted to just not fucking think about it.

Of course, that was the first red flag that something was up with Tiara. Silver knew the way her best friend's mind worked. By all rights she should be sulking in her room, refusing to come out because her cock was only slightly bigger than the smallest in class. Not being the biggest was one thing, but there was no way in hell that Tiara was going to just lie down and accept being almost the smallest. And yet here she was, as chipper and sunny and eager to hang out as was possible to convey via text. Whatever it was that Tiara wanted to show off, it was clearly really good if it could pull her out of the funk that she should by all rights be wallowing in.

Or, more likely, it was a euphemism for “I have a hare-brained scheme to get a bigger penis and I want you to participate.” It would hardly be the first time that Silver would find herself having to be the voice of reason to Tiara's latest impulsive plan to heal her wounded pride through extreme measures. Hell, it wouldn't even be the tenth time. There was a time, when they had been younger, when Silver would likely have been eager to join in, but age and maturity had significantly mellowed her attitude. Tiara not so much – she had always had a habit of acting first, consequences be damned. For such a smart pony, she sure liked making patently stupid decisions in the heat of the moment.

Silver decided that it would be for the best to assume that it was the former. If it did turn out to be the latter, then she could deal with that when the time came, but for the sake of her own mental well-being she decided to not think about the possibility for now. She would much rather something to take her mind off of her problems than yet another problem to add to the problem pile.

Of course, Silver's issue was marginally more rational than Tiara's. Even discounting that her pride was much less fragile, her cock was decidedly not the smallest in class. In fact, excepting the obviously illicit hugeness of certain outliers (read: Sweetie Belle), Silver ranked much closer to the top than to the bottom in terms of length. No, the reason Silver wasn't relishing the second day of penis exams was the same reason everypony else who hadn't gone yet likely felt the same; she really didn't want the whole damn class to have seen her penis. At least she wouldn't also be simultaneously humiliated for having a small dick, though. As much as it was somewhat petty, Silver didn't blame Tiara for being upset.

Or she wouldn't blame her if she were upset. No matter how much her mind wandered, Silver couldn't help but come back to how weird it was that Tiara seemed to have shaken the impending public shaming off like it was nothing. Either whatever gift she had been given was genuinely that impressive, or whatever insane plot she'd concocted was really that audacious. Either way, Silver found herself both eagerly anticipating and dreading her friend's arrival.

She didn't have to wait long, of course. Tiara wasn't exactly her next door neighbour, but she still lived only a few minutes away. Almost immediately after finishing that thought, her door flung open and Tiara confidently strode inside in that way she always did, quickly turning around to shut and lock the door to Silver's room. Another red flag. “So where's the gift?”

“What, you didn't notice?” Tiara replied in a sing song voice, shaking her tight ass slightly to the rhythm of her words. Silver swallowed heavily – she was wearing those slightly too small booty shorts that she knew Silver couldn't handle. Whatever it it was, there was no way she was hiding it in there. The shiny black fabric outlined her tight ass so perfectly she might as well not have been wearing anything at all. In fact, if Silver hadn't known better, she would have sworn they got even tighter since she last wore them. And she was fucking shaking it, too. She knew, she had to. “Why don't you hazard a guess?”

“Tiara...” Silver said, her voice dubious. “If you just came here to tease me, remember that we agreed-”

“Hush,” Tiara ordered, and Silver found herself clamming up completely. “I think you'll recall that you agreed that any kind of relationship between us would be weird, not we. Anyway, take off your pants.”

“Excuse me?!”

“Well, there isn't much point in comparing sizes if you've got pants on. Oh, speaking of which, you're also prolly gonna wanna get a hard-on, though I don't think we'll need to worry too much about that~” She punctuated her statement by giving her ass another little wiggle.

Silver rolled her eyes, but complied with Tiara's demands. When she got like this, it was much easier to just go along with what she wanted than to argue. Still, that didn't mean she had to make a show of it. She unceremoniously undid her belt, then her jeans, and let them fall to the ground leaving only her lacy white concealer panties. They were something of a necessity if she wanted to wear anything other than sweatpants – without them there would be a noticeable bulge, and Celestia help her wardrobe if she got an erection. As it was, there was no immediately visible difference between herself and a normal girl.

Once she took them off there was a very immediately visible difference between herself and a normal girl. Ten inches long, dark grey, and rock fucking hard. “Looks like somepony's enjoying herself~” Tiara teased.

“And whose fault is that, asshole!” Silver snapped back, turning to look away and blushing violently.

“Entirely your own, babe~”

“Don't call me that.”

“Sit,” Tiara ordered, and Silver once again unquestioningly obeyed, only rolling her eyes. It wasn't exactly an unreasonable request, anyway. “No, no, no, don't just perch yourself on the edge, sit on the damn bed.” Another exaggerated roll of her eyes, but once again she chose to comply rather than argue. She scooted her way back until she was more comfortably sitting on her bed. “There, see, was that so hard?”

“Is there any reason I have to be sitting in an exact specific place, your majesty?”

“If you sit too far forward you don't have enough of a lap for me to sit on, silly!”

“Wait, wh-” Silver didn't manage to finish her sentence before Tiara rather blatantly confirmed she wasn't joking about sitting on Silver's lap. She pressed her body tightly against Silvers, the taller mare's member nestling neatly into her ass cleavage. Silver panicked, moving to shove Tiara off, but the smaller mare deftly grabbed her hands and restrained them. Tiara certainly looked dainty and girly, but she was still an earth pony, and while Silver was definitely stronger, she was also flustered and unprepared. Tiara took her advantage and ran with it, forcibly mashing Silver's hands against her noticeable, sizable bulge.

At first Silver thought that maybe Tiara hadn't bothered wearing concealer panties. But that possibility was quickly dismissed – this was absolutely more cock than Tiara normally had. “Holy shit.”

“You like?” Tiara purred, grinning seductively. “It's big enough that none of my concealer panties were strong enough to hide it completely.”

“Tiara, what- how did- what the fuck?!”

Tiara didn't bother answering Silver's question. “Wanna see it?” she asked, and Silver merely nodded dumbly. “The right answer.” She moved Silver's hands up slightly, hooking her thumbs into the waistband of her hot pants and then further into her panties, then pulled them ever so slightly away from her body.

That slight amount of give was just enough to negate the already struggling enchantment on Tiara's concealer panties, custom designed to handle a cock significantly smaller than what Tiara was packing. They snapped loudly, and her cock emerged. It flopped heavily against Tiara's chest, hitting just below her pert breasts, before gravity kicked in and its weight pulled it downwards, resting at a slight upward angle thanks to the support of her hot pants.

“Holy shit, it's huge!”

“Fourteen inches, exactly. Oh, and you should see my balls.”

“How?”

Tiara smirked, and Silver found herself swallowing heavily. “That, babe, would be the really great gift I mentioned.”

“That doesn't answer my question.”

It was Tiara's turn to roll her eyes. “I'm gonna show you, duh.” She lifted her leg and quite suddenly spun around to face Silver, wrapping her legs around the larger mare's waist and pressing her cock against Silver's suddenly much smaller member. Her hands, still firmly grasping Silver's wrists, gently placed Silver's hands on her hips before removing them and draping them lazily over her PFF's shoulders. “Is it so wrong that I wanna have a bit of fun, first?”

“Tiara, you know how I feel about that,” Silver replied with a blush. “Dating you would be weird.”

“Then we don't date, duh. There's such a thing as friends with benefits, Silvy.” Silver didn't respond, merely blushing more fiercely. “Tell you what, we can try it out and if you really don't like it then I promise you it won't ever happen again. Trust me, I've got my pick of basically the entire town. I'd like to have you, but if I can't I think I'll live.”

“... Okay. Fine. But I reserve the right to pull the plug at any moment.”

“No opting out immediately.”

“At least five minutes, then, but once we hit five minutes I can say stop and you'll stop.”

“I accept your terms. The safeword is banana.”

Silver rolled her eyes. “Nerd.”

“You're one to talk,” Tiara replied with a giggle before leaning forward, tilting her head slightly upwards, and kissing Silver. Gently at first, but she quickly pulled herself tighter against the larger mare's body. Their cocks rubbed against each other, drawing a muffled moan from Silver's lips and some spurts of pre from both of their stallionhoods. Tiara pulled her legs tighter, and moved her arms from gently draping over Silver's shoulders into a full, proper hug. Their tits mashed together, just slightly too high not to envelop their cocks. Neither mare had ever been particularly endowed in that regard, but Tiara's breasts had always been slightly bigger than Silver's. Tiara broke the kiss, briefly giving Silver's lower lip a gentle nibble before pulling away entirely.

Both mares were far too preoccupied with each other to notice that Tiara's cutie mark had begun to faintly glow.

“Grow.” Tiara's voice was hard, powerful. Like steel, cold and uncompromising. It was an order, and it was directed at Silver Spoon.

“Y-yes, ma'am.” The words came out almost on reflex, feeling as natural on her lips as slightly jerking her leg in response to a doctor gently tapping her knee with a hammer. As natural as the tightness that blossomed in her chest and spread out throughout her entire body and then more. A tension in her arms, her legs, her cock, even her tits, like her whole body was doing a yoga routine. And then just like that, it went away.

Tiara seemed nonplussed. “Not what I meant. Note to self; be more specific in the future. Hm, not exactly unwelcome though. Yeah, I'll bet I can work with this.”

Silver's head was swimming, like it was the peak of allergy season and she'd just gotten a face full of pollen. “Tiara, what did you do,” she said, not registering that she had to look down ever so slightly more than she had a moment ago in order to look Tiara in the eye.

Which was why this time she did notice Tiara's cutie mark was glowing, a brilliant pink light intense enough to shine through her hot pants. “Silver Spoon's penis will grow to be exactly twice the size mine is currently at, with proportionally appropriately sized testicles.”

Silver groaned as the tension returned, much greater than it had been before. “Actually,” Tiara continued, leaning in close again and almost whispering directly into Silver's ears. “What do you say we go for broke? Silver Spoon's cock will grow to be exactly four times the size mine is currently, with proportionally appropriately sized testicles.”

Silver let loose a wordless cry of pleasure as her body obeyed its master's commands. Her cock grew, so big so fast that it knocked her onto her back. “Ack!” Tiara grunted as the expansion dislodged her entirely, sending her flopping down onto the floor with an “oof” as the air was knocked out of her lungs. She took a moment to slide her legs off of the bed and onto the floor so she could slowly pull herself upright and get a good look at her handiwork, only to bump her head and fall back down.

“... Okay,” Tiara said in quiet awe as she stared up at the giant pillar of flesh she had created, jet black and glistening and almost as big as she was. Its sheer weight pulled it downward, leaving it almost parallel with the bed. “Maybe I went for broke a little too hard.” She once again stood up and took in the damage. Not only was it almost as big as she was, it was damn near as big as Silver. There was absolutely no way Silver was going to be able to function with a cock that big. “Okay, uh. Don't panic. I can just undo this once we're done here, order you to shrink down to like two feet or somethin'. Probably.”

“Wait,” Silver managed to force out. “Start from the beginning. What the fuck was that.”

“Uh, short answer is that apparently I can order body parts to grow?” Tiara replied sheepishly, reaching down and grabbing Silver's arm, helping her into a sitting position. “I kiiiiinda haven't tested the reverse yet, actually so, uhhhhhhh-”

“Tiara what the fuck.”

“It's okay! I think I have a plan!”

“What the fuck do you mean you think you have a plan,” Silver snapped. She had known Tiara all her life and was acutely aware that her plans were almost universally bad ideas.

“Shhh, gimme a sec to compose myself.” Tiara paced frantically, back and forth in a wide arc around Silver's enormous cock. “Okay, so I've tested making my cock bigger, I've tested making other ponies' cocks bigger, I didn't mean to test making other ponies bigger in general but did it anyway. I haven't tested making myself bigger, or making other body parts bigger. I sort of tested making my nuts smaller, but my heart wasn't really in it, and I absolutely haven't tested making other ponies smaller.” She turned abruptly facing Silver and pointing dramatically while her still erect cock wobbled from the inertia of her movement. “So obviously the best answer is to make you big enough that your cock isn't a burden, then experiment with shrinking you down so that if it turns out it doesn't work then at least you'll be proportional!”

“... Tiara, that's a terrible idea,” Silver replied bluntly. “I could still probably just get stronger concealer panties, but making me into a giantess is absolutely not going to-”

Tiara clearly wasn't listening as she interjected with another order, her cutie mark ablaze with pink light. “The entirety of Silver Spoon's body except for her penis and testicles will double in size.”

“God dammit Tiaraaaaaahnnnnn~” Silver's admonishment was interrupted by her growth, all six feet of it in a span of a few seconds. Her body exploded outwards, once again with enough force to knock Tiara off her feet. Her bed creaked and groaned beneath her before giving out entirely, breaking cleanly in half and leaving her sprawled on her bedroom floor.

“Holy shit. Okay, uh, note to self next time don't do all that at once?”

“Fucking- Tiara I'm too big to stand up. I don't think I can fit through the door now!”

“Yeah, but now I can shrink you down all at once and you'll still be proportionally bigger than me.”

“Like that's the most important thing here.”

“Hey, it hasn't been five minutes yet, that means I still get to experiment a bit before you can make me stop!”

“Ugh. Fine, but I don't see us having sex given how big I am.”

“Pfffft, relax, I have a plan.”

“If it's anything like your last plan, I want no part of it.”

Once again, Tiara seemed happy to entirely ignore Silver's input. “My body will be able to take any penis, no matter how big, without any discomfort or ill effect. It will also be able to handle any amount of cum, no matter how extreme or excessive, again without discomfort or ill effect.”

“Tiara for fuck's sake, I'm not going to test that.”

“Why not? I'm pretty sure I covered everything just now. And my cutie mark was definitely glowing which means it worked.”

“Tiara if that didn't work you will definitely die.”

“Silver, you promised.”

“Banana.”

“Oh, come on.”

Silver acted as indignant as a twelve foot tall mare was capable of in a room with a ten foot ceiling. “Banana,” she repeated. “It's been five minutes, anyway, look at the clock.”

“Ugh, fine, look.” Tiara produced her phone, seemingly from nowhere – and Silver wasn't particularly interested in knowing the answer to that particular mystery at the moment. “Compromise. I'll bring in someone whose wellbeing is less important than yours or mine and we can test this out on a smaller scale.”

“Oh my god Tiara don't be a fucking sociopath about this.”

“Toooooo late I already dialed,” Tiara replied with a sing-song tone of voice before putting her phone to her ear. “Hello? Hi, Twist, it's Tiara. Would you mind stopping by Silver's place asap? I've got something I wanna try out.”