As promised by Trixie, when the two of us left The Horizon Joint and got back out onto the twilit streets of Canterlot, the rental carriage was there for us. The driver had been waiting patiently to take us back to the royal palace posthaste.

The two of us got in, not speaking much, just overcome with nerves. We sat together on the soft plush seats as the carriage rumbled its way up the hill to the palace. My hands ran across her back and shoulders, indecisive as to whether to feel the silk covering her skin or slip under to feel it directly. One of her hands gently stroked my leg, occasionally straying towards the bulge at my crotch but too hesitant to make it all the way. Nervousness was giving way to... well, horniness, albeit slowly.

An admittedly odd thought occurred to me. "I'm already overdressed," I said out of the blue.

"What? You look snazzy," Derpy said. "I don't mind."

I let out an unsatisfied 'Hmm' and studied my own outfit. Then I hit upon an idea. After untangling myself from Derpy for a second, I took off the black suit, slipped off the tie, and unbuttoned the dress shirt nearly down to the navel. Now I was ready for the cover of a romance novel. Sliding back to Derpy's side again, I grinned and said, "That's much better, right?"

Derpy's hand slipped under my opened shirt and rubbed my flat chest and stomach. Her gray hands felt pleasantly cool on my skin. "Yeah..." she said back with a growing smile. She giggled, and I couldn't help but giggle back.

Feeling emboldened, I reciprocated with my own hand reaching towards Derpy's chest, gently pressing my fingers against the top of one of her big gray breasts and sliding into her cleavage. She simply closed her eyes and snuggled closer to me, flexing her chest upwards as if to attempt to capture my whole hand hands-free. It was all I could do not to stick my head in and lose myself in a breast-worshiping stupor right there, but I was holding myself back for... some reason. Something about tonight being important. A reason that was getting lost in the arousal as my hardness strained against my slacks.

The carriage rolled to a stop before I had even realized we were close, both of us mid-heavy-petting. Feeling very much in a hurry, I threw open the door and stepped outside, my jacket looped around my arm. I stood at the door as if to gently help Derpy down, but as soon as she was within reach, I swept a hand behind her knees and hefted her up into my arms.

"W-Wooah!" she cried out as I carried her bridal-style. It was a tad awkward, with the pegasus's wings folded against my lower arm and her paper bag of goodies clutched against her chest, but I was determined to make it work. She chuckled nervously at me and said, "Y-You don't have to do this..."

"Who said anything about 'have to'?" I replied with an uncharacteristically cheeky grin. I nodded to the carriage driver, who waved us goodnight and pulled the vehicle back down the paved road to the city, while I marched toward the gate.

Derpy's hands twitched and wandered, not sure what to hold onto, before eventually looping around my neck. She craned her neck to look at the path before us. "You sure you, um, want to carry me all that way? Aren't I a little..." She blushed and looked at the ground in embarrassment. "...heavy?"

Truth told, I was already struggling a little bit to hold her up properly and walk at a brisk pace. I wasn't an overweight loser anymore, specifically, but strength and stamina still weren't my strong suits without magic. But what did I care? "Think of it this way," I said, unable to keep the strain out of my voice. "When else am I gonna get the chance to do this? To carry you across the threshold... of the Royal freaking Palace?"

Derpy brightened up and nuzzled against me as I made my way to the drawbridge. "Lots of times, I hope."

I grinned. "Fair." Equestria had a few palaces, and I could crash at any one of them, plus guests, whenever I liked. "Still."

"Mmhmm," Derpy agreed with a nod. "Still."

Taped to the door to our suite was a note.

I was almost too sweaty and tired to read it properly.

Dear Honored Guests,

We appreciate that you have been through dire circumstances and have a great need to unwind and celebrate. We have also been informed that you are involved in specialized and sensitive work that the Princesses have deemed important.

The endless cleaning of your room, however, is a situation we can no longer abide.

A new suite is being prepared for the human, Pascal, to serve as his office and "office." It will have all manner of enchanted amenities to keep up with the demands of his station. Self-cleaning sheets and carpets, magical towels, and the like. It will be expensive, but Their Royal Majesties Prince Blueblood and Princess Luna have already covered the costs, and your group has already demonstrated that such investments will pay themselves off very, very quickly.

Tonight will be your last night in this room. We understand that you will be coming back from a date of sorts.

Do your worst.

Sincerely,
Assistant Chief Custodian of the Royal Palace of Canterlot, Sugar Lemon

"...Huh."

Derpy's eyes widened, and then gasped in delight. "That means I can use the– Yesss!" She opened the door and dashed into the room, leaping onto the bed with a flap of her wings.

I followed in and smoothly closed the door behind me. With the 'click' of the latch, my heartrate spiked. I tossed my jacket aside without a care and beheld Derpy sitting at the edge of the bed, her thick, curvy, angelic body held back by what amounted to little more than decorative cloths and straps. In our haste, neither of us even thought to turn on the lights in the room – the only illumination was the moonlight peeking through the window curtains.

There had been plenty of outercourse between us already. Tonight, we could have everything. The only question was... when you can do anything, where do you start?

The question had to have been plaguing Derpy, too. She looked up at me bashfully and squirmed on the bed, murmuring, "So... what do you want to start with...?"

"I, uh, I was hoping..." I trailed off. The rest of the sentence was 'hoping YOU had an idea,' realizing too late that if both of us were nervous and looking to the other for leadership, nothing would happen. I put my hands on my forehead and wiped downward, groaning at my own awkwardness. "Ughhh..."

Derpy chuckled, scratching the side of her head. "Guess we don't just magically turn into sexy beasts like all the romance novels say."

"I mean, gaaaah," I groaned. "I had some gumption for a second there, and then just–"

I was interrupted by Derpy's hand reaching out and tugging me by the belt, sending me stumbling forward onto the bed, landing half-atop, half-beside her. She laughed a cute little laugh, right in my face, and I saw no better way to retaliate than kissing her on her soft pony lips. My hands sought to do away with her clothing, lifting her nigh-transparent babydoll dress up and away from her straining, trickling teats. Pretty soon after, the rest of both our outfits went flying off the bed, until we were equally nude before each other.

Our eyes roamed over each other's naked body, both fully aware that there was uncharted territory to explore, both hungry to seek it out. I let out a sigh of effort, trying to retake my mind from my id, and said in a low, quiet voice, "This night is all about you, Derpy. You're the one going back to real life in the morning, so you get whatever you want."

Derpy's eyes bounced between my face and my cock. "Y-You mean... I take the lead?"

I had to admit to being a little confused there. "Haven't you done so plenty of times already?" I always felt like I was following her suggestions, in and out of bed – for the better, of course.

"I mean kinda, but... I dunno," she said bashfully, crossing her legs and looking aside with a shy smile. "We've kinda gone back and forth, playing off each other, but I haven't... I dunno..."

There was something she wasn't saying. "Whatever it is you want to say..."

Derpy nodded and looked back at me. She rose from her sitting position and crawled towards me on the bed. "This whole time... we've been focusing on your pervertedness, how to live with it, how it fits in Equestria, that sort of thing." I nodded, and she continued. "But I kinda wanna... I mean, you probably already knew, but I sorta wanna... show you..." Her head lowered towards my proudly jutting cock, her breath warming it in the cool air of the room. "...how much of a pervert I am, for real. The pervert I was never allowed to be in this world..."

I adjusted by posture, discreetly pulling a few cushions behind my back to prop myself up. "I'm all yours," I encouraged.

The blonde gray pegasus breathed heavily on my cock for a while longer, her wall-eyes seemingly straining to take it all in. "Oh my gosh, it looks different..." she half-whispered.

"Yeah, Moondancer..."

"Oh wow..." Derpy gulped, steeled herself, and then gave my cockhead a tentative lick. I'd had plenty of blowjobs up to this point, but coming from Derpy, just that alone was electric. She seemed to like the taste too, and immediately dove in to suck the whole fat head into her mouth, closing her eyes and swirling her tongue around it – just feeling what it felt like to have cock in her mouth for the first time.

"Ah, Derpy..." I moaned.

She pulled back and wiped her mouth, looking up at me with awe. "Amazing... I felt like – like I instinctively knew what to do, to keep my teeth away, to do certain things with my tongue..."

I couldn't help but grin lewdly. "So, it looks like that's what you inherited from your pony ancestors." For some ponies, it was a heightened sensitivity to human taste or pheremones or aesthetics. Maybe Derpy's genetic quirk was the remnants of their engineered sexual instincts and empathy?

Derpy seemed awestruck by the idea. "You mean I really could be a... a sex–"

"A sex goddess?" I finished. "If anypony had the potential..."

A sense of fiery determination seemed to fill Derpy's golden eyes. She dipped her head down again, but not to suck the head of my cock again. Her aim went lower, nuzzling her pony nose against my shaft as she laid down flat on the bed, so she could nuzzle into my frankly oversized ballsack and give each orb a long lick with her broad pony tongue. I groaned, and my cock twitched, the first drop of precum leaking from my slit thirteen inches above Derpy's mane.

But Derpy wasn't done yet. She moved her head upwards, leaving little kisses and licks from the tip of her tongue along my shaft as she rose slowly, until she was at the now-dripping head of my cock. She gave it two full licks, savoring the flavor of my precum on her tongue, moaning pleasurably. Then she dove down again, this time licking and kissing at the left side of my cock, down and up. Then again on the right side, faster and more frantically. I had to squeeze my eyes shut and really try to control my breathing, because this was a truly unreal treatment.

Derpy finally took a break to catch her breath and swallow some excess saliva. "Hehe," she giggled, "was it that good?"

"Holy hell, Derpy..."

She gave me that cute bashful smile again. "I... might've asked for some tips from Trixie."

My eyebrows rose. "Those didn't feel like Trixie's moves."

The pegasus sputtered into laughter and covered part of her face with her hand. "I-I mean it was general advice, that sort of thing..." She peeked at me between her fingers. "It was really that good?"

I grinned and flexed my hips, making my desperate saliva-slicked erection bob. "Welllll... I don't think you're done yet."

"Aha, of course not," she replied, and lowered her head again. She took just the tip of my cock into her mouth and suckled, and it felt like she was drawing precum straight out of my cock. I came dangerously close to the edge, and pulled my hips back to attempt to stave it off. My cock flexed with pre-orgasm anticipation, and a strand of off-white cum squeezed out and drooped toward the bedsheets.

Derpy dove her head down quick and licked up the strand of semen, sucking it all the way back up to the source before taking my cock into her mouth, denying me my desire to hold back. She started to push her head down, but it was too late for me – I groaned and my eyes glazed over as I started cumming.

My marefriend's golden eyes widened as the first powerful spurt of cum shot into her mouth and halfway down her throat. She pulled back and swallowed with some effort, and the next spurt was already on the way. She seemed to panic a little but refused to pull back, gulping as fast as she could. Her hands reached up and grasped the thick swell of my shaft, as if to steady it or hold on for dear life. She visibly stifled a cough and kept swallowing.

Mercifully, my orgasm began to taper out. By some miracle, Derpy had only let a single trickle of cum escape through the side of her mouth. When my cock had seemed to stop, she pulled back to seal her mouth closed... but the sensation of her lips dragging across my sensitive tip sparked one last spasm from me, spewing a strand across her muzzle, causing her to flinch slightly. Once everything fell still, she took her final gulps, which were deafening in the quiet.

Derpy gasped for breath and stroked her fingers across her neck. "W-Woah," she croaked, her voice a little raspy. "It feels like... it's kinda sticking to my throat a bit. Wow..."

"Some water?" I suggested.

She nodded and got up from the bed, making her way to the bathroom to grab a glass of tap water. With nothing else to do for a second, I made some room on the bed and stroked my cock to inspire it back to life. Derpy came back glugging a full cup of water, gasping as she finished it. She wiped her mouth and muzzle with one of the bathroom towels, and grinned nervously at me. "So... good, huh?" Her voice sounded clearer now.

"Derpy," I said, "I literally tried to hold myself back and couldn't. That was amazing. Your first time, really?"

Her face seemed to glow in the dim moonlight, she was so embarrassingly pleased. "My first blowjob..." she practically sung. She licked her lips with her tongue. "And all those ponies were right; you really do taste amazing. Like... I don't even know how to describe it. Kinda... sweet and savory and like pure sex all at the same time. And this is without the addictive thing, right?"

I let out a sigh of relief. This is what it had all been for. This is what made it all worth it. Derpy could taste my cum safely, and now she had. "Right. You ponies just seem to like the flavor on top of that."

Derpy just grinned and climbed back onto the bed, and before I knew it she was crawling over me, making me lean back, while her big gray milky breasts dragged across my bare chest. "So," she said down to me, still grinning wickedly, "you know what I wanna do next?"

I couldn't see past her humongous bosom, but I could feel her thighs and pussy bumping into my re-hardening cock, searching for the right position to line up. I could feel the heat and moistness between her legs. I smiled nervously up at her. "I'm ready if you are..."

She nodded and lined up her trembling hips. Her pony-pussy winked and grasped the tip of my cock, dripping warm lubrication onto it. Gently, slowly, she lowered her hips down, my fattened cock spreading her at the same time as her inner walls squeezed and rippled around every new inch. We both groaned at the same time, gasping and losing ourselves to a rutting sensibility. Our pelvises moved randomly, wantonly, as we began to seek the limit of how much friction we could create between us. Derpy was wet and hot enough that there was no such thing as too fast.

I was in some kind of heaven, Derpy's curvaceous body bearing down on me from above while all I could do was thrust upwards into her. My instincts cried out for some way to turn the tables and make her feel even better, so I nuzzled one swinging breast upwards and somehow sucked a nipple into my mouth, immediately drawing forth nutritious pony-milk and guzzling it down.

Derpy stiffened and she cried out. Her other nipple flowed faster onto my shoulder. "That's not fa... fuh... faaaiiirrrrrrr!!" she moaned loudly, her voice practically bouncing off the walls.

I was in no position to respond, physically or mentally. There was only her nipples in my mouth, my cock thrusting in and out of her squeezing, milking pussy, and her limbs bracing against the bed on either side of me for dear life. I reached out and took one of her hands, interlocking fingers and squeezing tightly. She instinctively gripped me back.

Derpy was the first one to cum, her cunt suddenly forming a death-grip on my length and spasming around me, letting out a squeaky gasp every time her body convulsed and sent femcum squirting down my shaft. I still had some distance to go, so I slowed my thrusts, gently fucking her.

My marefriend lost some of her energy and fell on top of me, her breasts squishing around my head. I gently rolled us to the side, so now I was the one on top of her, still sucking milk out of her sensitive teat and lovingly sawing my cock in and out of her. She shuddered and moaned each time I bottomed out inside her, and her pussy spasmed each time the thickest swell of my cock stretched out her lower lips. I switched to the other nipple, still in a lewd fugue, and rubbed the sides of her breasts with my hands in slow circles, coaxing more and more milk to the surface. Derpy's back arched and her breasts trembled, before milk sprayed into my mouth and over my back at the same time, as her boobgasm sent her body writhing. Her cunt squeezed rhythmically around my cock once again, tugging at the underside in just the right way to push me over the edge. I popped my lips off her thick nub and grunted quietly, letting my cock pulse deep inside her, filling her greedy pussy with every ounce of cum I could summon.

I collapsed onto Derpy's body, my head landing amidst her leaky gray breasts. When I finally opened my eyes and regained some measure of rational awareness, I saw Derpy's face beaming down at me, as her hand started to pat my head. "You're... so cute when you cum, you know that?" she said.

"W-What?" I sputtered with a raspy laugh.

Derpy shrugged her shoulders, making her boobs bounce against my ears. "You look so... I dunno, relaxed? Like you've been holding onto so much stress and you're finally letting it out." Her ears folded back against her head and her sweaty blush got a little redder. "Makes me feel like I'm doing something amazing... like, I'm the one who fixed the whole world for you."

I grinned again and picked my body up so I could lean up and kiss her, my cock still buried in the sloppy union of our sexes. "You fucking did, Derpy," I muttered back. "You fucking did."

She gasped as our genitals squished together and our combined fluids leaked onto the sheets. "Wow. It really is kinda tingly. Not that I would know otherwise, I guess..."

I kissed her, hoping to dispel a few of her concerns. "The important thing is, it's safe."

She smiled and nodded up at me. "Yeah, and it was super worth it." She got a dreamy look on her face. "I've finally had a pussy-gasm with you... and not just from your tongue!"

I actually frowned a bit. I was in no mood to eat her out now that she'd been creampied.

Derpy noticed my expression and pouted. "Aww... Should've done that first?"

I looked away a little embarrassedly. "It's amazing to you ponies 'cuz you were engineered for it, but... it's still just semen to me."

"Oh well!" she said with a giggle. Her hands lifted against my chest, which I took as a signal to slowly pull my cock out of her. She lifted her legs, bracing them on my shoulders so she could lift her hips upwards, and then pushed her breasts apart so she could look down at her leaking pussy. A thin trail of cum ran down the curve of her buttocks. "Woah," she said. "I'd be super-pregnant now, huh? If you were a pony, I mean."

I grinned, nuzzled her calves against my face, and rubbed her belly. "How does it feel?"

"Warm..." Derpy said, smiling. "Warm and good. And kinda tiring, actually..."

I laughed and gently lowered her legs so she could lay flat on the bed again. "Break time?"

She looked down where I knelt; my thrice-enhanced cock was still half-hard. "I guess... if only to figure out what we do next."

I shrugged and made my way over to lay beside her. There were more than a couple of wet patches on the bed thanks to our cum and milk, but tonight was officially the night to not care about that. I laid down on my side, propping my head up with my hand. I lifted my leg to go for the full seductive pose, my cock springing up against her belly. "So. We got the mouth and the pussy," I said matter-of-factly, smirking a bit at the causal lewdness. "Anywhere else you want this?"

Derpy looked unsure. "I guess that just leaves the... the b-butt..." Her golden, messy tail twitched beneath her.

I toned back my playful eagerness. "Don't feel like it?" Back during our day-long threesome with Trixie, she had done plenty of training with the army of dildos they'd bought from that adult shop in Canterlot's back streets, and had expressed a desire to give me the real thing at some point.

She seemed to deflate in disappointment. "Not really. It's one thing when it's a toy, but um... I dunno, I... I'd rather... I like your cock too much to put it back there?" she said hesitantly. "I don't wanna stop all the other things we can do with your cock just to... do all the preparations and the... after-stuff."

I thought about it and nodded after a few moments. "Especially because neither of us are unicorns who can do lubrication and cleaning spells. Though that may change!"

Her pout disappeared, and she nodded, happy that I seemed to understand.

I glanced over at the closet, where the first paper bag of 'party supplies' was still kept. "Wanna break one out?"

Derpy shook her head. "Nah. Tonight, I just kinda wanted to be about our bodies."

"Of course," I agreed, and leaned over to kiss her again. It was only going to be a quick smooch at first, but it quickly turned into another prolonged makeout. A few seconds into it, I discovered the taste of my... emissions on her tongue, but I powered through it.

My slight cringe didn't go unnoticed, unnaturally perceptive as Derpy was. "Whoops," she giggled, "guess the water didn't wash it all out."

I shrugged. "A little aftertaste, I can deal with." I gave her a rub on the shoulder and sat up, stroking my cock to reinvigorate it. Wasn't difficult with the sight of Derpy's freshly fucked body before me, her pussy reddened and leaking and her breasts heaving and... leaking as well. "So not anal, but we've both got some energy to go."

Derpy pushed herself up and focused one eye on my dick. "Actually... I kinda wanna try another blowjob."

"Sure!"

"But this time... you standing up? And me on my knees..." She grew more bashful with every word, poking her fingers together. "And maybe your hands on my head...?"

I half-smirked and crawled back so I could stand on the carpet, with my absurd-for-my-world thirteen-incher stabbing forth. "Maybe instead of kneeling, would it be easier if you sat on the side here?"

Derpy shrugged. "Yeah, that could work." She scooted over a few times until she could swing her legs over the side. The way the giant Princess-sized bed was built, her head was a few inches above the level of my crotch, but my cock was long enough that she could simply lift the tip up to her muzzle. She smirked and gave it a little kiss, which got her a twitch of appreciation.

I adjusted my feet, making my stance more rigid. My hands tentatively strayed to the top of her head, first giving her a couple of scratches behind the ears (which made her close her eyes and coo) before settling atop her mane. "I'll follow your lead," I said. "Going for the deepthroat?"

She nodded vigorously. "Mmhmm." She hesitated, but then started to delicately push her head down on my cock. I applied gentle pressure with my hands, trying not to force her but still trying to provide a semi-dominant presence.

Derpy kept going down my cock, her mouth spreading wide around the thickest part of the shaft. My thick cockhead poked at the tightening entrance to her throat, and I pushed down on her a little more. I closed my eyes, to try and navigate this by exquisite feeling alone.

But then there was a tapping on my wrist. Frantic tapping.

I lifted my hands, and Derpy's head rose. She pulled her mouth off my cock and swallowed several times. She gasped with a big intake of breath and pounded her upper chest with her fist, swallowing again and clearing her throat.

I watched her carefully. "Y'alright?"

Derpy's shoulders slumped. "No..."

I sat down on the bed next to her and rubbed my hand along her back.

She put her face in her hands. "So much for the 'sex goddess savant,'" she grumbled into her palms.

"It's okay," I reassured her. "Honestly... I'm kinda relieved?"

"What??" she barked, whipping her head around at me.

I shrugged helplessly. "I was starting to feel like the 'porn logic' of this world was starting to get a little too convenient. But if you're not ready to just jump straight into deepthroating... then that actually feels more normal. More real."

Derpy pouted. "Thanks. Doesn't make me feel any better..."

I looked to the floor, not sure what else to do. "I'm not disappointed, is what I'm saying. Not one bit. In fact, I'm kinda proud that you found your limit... and I had the presence of mind to listen for your signal in the heat of things. Consent and all that. We both did good."

She let out an unconvincing chuckle and sighed, rubbing her neck. "Like, I know that we're built for it, but... I dunno, sorry. I just felt like I would screw up and hurt one of us. Like I usually do..." She slapped her thigh testily. "Won't do anal, won't do deepthroat..."

I hugged her from the side. "I don't need you to do any of those things."

"Because you've got other girls for that," Derpy muttered half-heartedly.

I kissed her on the cheek and rubbed her shoulders. "You're still my special somepony."

She chuckled wryly. "Sure... now you put on the moves and be all romantic..."

"Because it'd be real awkward and I'd be a real shitty boyfriend if I didn't," I replied, gripping her shoulders more firmly and massaging them. "I'm not romantically illiterate all the time – just most of the time."

Finally, that managed to make Derpy laugh. She then leaned her head against mine. Her hand drifted down to my wilting, denied cock and she wrapped her fingers around it. She idly stroked me up and down while she rested her head in the crook of my neck. "We're both really bad at this, aren't we?"

"I dunno, we've gotten an orgasm or two between us," I said encouragingly. My own hand wrapped around her side and cupped one enormous gray breast, rubbing and softly squeezing from below. "But I'll admit, I've been kinda coasting off ponies' natural expertise... and receptiveness. Turns out I'm still kind of a fumbling virgin."

Derpy scoffed. "Pfffft. Says the guy who spent the few days driving me wild with his hands, lips, and tongue. I'm the fumbling... well, not-virgin-anymore."

I blinked a few times in surprise. "Was that really your first time?"

She nodded and said, "Yeah... As far as that whole 'V-card' thing goes, I guess. I think the moment you took my–" She stifled a giggle "–'B-card' was way more magical."

"B for Boobs," I said with a grin.

She let out a heavy breath and looked over to the door, where her gift bag was still waiting. It seemed like she was trying to decide on something. "I guess that just leaves... the surprise."

I pulled my hands away and followed her gaze. "Surprise?"

She stood up and flapped her wings, hopping over to the bag in one quick hover. She rifled through it, past the pocket planner and clothes and other goodies from the day's plunder, and pulled out a potion bottle. In the moonlight of the room, I could only see that the liquid inside was glowing a faint pink color.

Derpy hovered back to the bed, kneeling at the foot of the mattress. I crawled over to try and get a closer look at the potion. It had a label on it, but at this particular angle it was too dark to make it out. "What's that...?" I asked quietly.

She sighed. "Something I wasn't sure I would use." She turned the bottle around. The front label had a symbol of an hourglass-figured mare, with motion lines around the breasts and hips. "It's... Well..."

"Is that a growth potion?" I said with a growing grin, trying not to sound too excited.

"Yeah... Trixie got it for me..." Derpy said hesitantly. "I got it 'cause..." She hung her head. "It's probably going to sound weird when I say it, especially considering how I've screwed up everything else tonight..."

"You've done no such thing," I insisted.

Derpy focused her eyes the best she could on the bottle, which she swished back and forth. The pink liquid glowed a little brighter whenever it rippled. "It... It's for me to... to try and... try and fix the problem with..." She groaned to herself and started again. "I know that... really big sizes are your fetish and... that night with Celestia kinda ruined that a little for you."

I stiffened a little, flashing back to the experience of practically drowning in Celestia's flesh... and drowning in despair at the same time, as I rapidly learned what had been done to her and why she hated it so much. The great irony was that, back home, I'd have eagerly fapped to an image of Celestia that big. But now, the thought of it made my blood run a little cold.

Derpy looked over at me contritely. "So, when we were at the shop, I asked for this Hourglass Potion. If I drink the whole thing in one go, it'll make me as big... well, around as big as the Princess."

My eyes widened. "Derpy, that's..."

She suddenly found the patterns in the blanket real interesting. "I... I wanted to try and fix that for you. Show you that... you don't have to feel guilty for liking big things, just like I don't have to feel guilty for having them. That there's somepony out there who'll do that for you, whenever you want, and it can be... happy... a happy thing."

My heart melted, and I actually had to blink back a couple of tears. I raised a hand to my lips and murmured, "Fuck... Derpy, I..."

How was this mare so good at mixing lewd and cute and meaningful like this?! It wasn't fair!

I lunged forward and wrapped my arms around Derpy, hugging her tightly. "That is just... I have no words, Derpy. I don't fucking deserve you."

Derpy smiled and shook her head. "No, Pasky. You worked hard for this. You earned me." She pushed me back, popped the cork on the bottle, and glugged the pink liquid down in five or six gulps. She tossed the glass bottle aside; it bounced off the carpet and rattled at the edge of the room, empty and already forgotten. The pegasus pushed me back a little bit, turned around, and sat in my lap. She then grabbed my hands and placed them against her breasts, where I was just able to reach all the way to her milk-moistened areolae. "I wanna spend the rest of the night like this," she said more confidently. "Big... for you. Because I choose to."

I kissed her neck and buried my eyes in her mane. "That's more than I could ever ask."

The first thing I felt was her big bubble butt pressing harder into my crotch, overflowing my legs. Derpy moaned as it lifted the rest of her a little higher up. From the sheer intimate feeling of it really happening so close to me, I was rock-hard in an instant. I could feel her breasts swelling outward, spreading my fingertips wider, as more and more flesh grew out of my grip.

I spun Derpy and myself around, her bigger breasts swinging wildly and nearly knocking her off balance. Now instead of facing the room, she was pointed towards the pillows at the head of the bed. She looked back at me and grinned nervously. "I'm not sure I'm gonna fit..."

Her ass was getting so big that I couldn't really crane my head up to hers, so I leaned down and kissed one of her growing buttocks. "Sounds like an adventure..." I started to extract my legs out from under her. Derpy did the same, spreading her legs to either side so her ass could grow unobstructed.

As big as Derpy's bubbles were growing, stretching out the cutie marks, her breasts were growing twice as fast. They were already big enough to make contact with the bedsheets and slowly conquering more and more of the mattress. I was sorely tempted to climb over there and experience those breasts growing against me... but I was having a wonderful time hotdogging Derpy's cheeks and feeling her ass grow both against my hands and on either side of my shaft. I squeezed and even gave her a light spank, making her miraculously taut giant ass jiggle.

She grinned and stroked the tops of her own tits, the only parts she could reach at this size. "This is... really good, actually. They were sensitive before, but – ah! – it's like, over so much more space now."

"Oh god... I can't believe you did this..." I grunted as I spurted some precum between Derpy's now torso-sized buttocks. I could practically hug them. "I love this...!"

"I love this too...!" Derpy replied, her voice gooey with pleasure. "Fuck I can feel how much you love this, like... like the first time we met...!"

I knew the feeling very well. The first time I'd seen Derpy's breasts grow out of her minimizer pasties... We were recapturing that moment quite successfully.

Derpy's ginormous rear was very close to making me cum... and forcing me off the bed entirely, unless I surrendered and sank into the cavern between her cheeks. I pulled back and dashed around the bed, seeing her sex-blimp of a body in profile. Her breasts were big enough for the nipples to be pressing into the pillows at the farthest edges, thick spurts of milk staining them and nudging them off. Derpy looked down at me from atop her body, grinning drunkenly at the size difference between us. "Ah fuck... I'm so biiiiiig..."

My mouth was dry. "That... you are..." I gulped and made my choice. I ducked and lifted one gigantic teat, weighty with milk, so I could climb under it. Derpy gasped and her arms felt around the top of her breasts, trying to sense my path.

I had to arch my back to keep the giant, still-growing-but-slowing-down tit from crushing me. I managed to reach the center of the bed, right where the pillows were, and turned my body around so I was laying flat on my back, with a pillow under my head. All I could see above me was a bit of light pouring through a vast canyon of boob. It was hot and stuffy and overflowing with feminine pheromones, the scent of Derpy's sweat and skin. It took some more maneuvering to unpin my cock from against my leg, so that it could stick up straight into Derpy's impossible cleavage. My 13-incher was no match for Derpy's bombers, but I was sure as hell determined to make the best use of it.

"P-Pasky!" Derpy's muffled voice cried out. "Are you okay?"

I responded with a hard upward thrust. My cock dragged across her huge, soft mountains of breast. Her tits wobbled and jiggled, echoing my kinetic force across her skin and bouncing it right back to me, stroking my cock with the weight of two enormous boobs at once. I heard Derpy gasp, and I heard jets of milk splash against the back wall on either side of me.

My hands roamed frantically over every inch of underboob I could reach, squeezing and rubbing and stroking whatever I could, which was proportionally inadequate. No matter how hard or high I thrust my cock into her tits, it didn't even feel like I was reaching a halfway point. And yet, I felt the zen of the truly breast-obsessed – utterly embosomed once again.

"So good, so... AHHH!" Derpy cried out above me. The giant breasts around me grew taut and trembled. Twin gushing blasts of milk soaked the wall behind the bed, disgorging another miniature flood of milk with every pulse of Derpy's mega-bosom. I could almost feel the milk ducts rushing her life-giving nectar past my cock. My eyes glazed over, and in the near-total darkness between her tits, seeing didn't matter. Only the sense of touch.

"I love you Derpy!!" I cried out incoherently. My cock pulsed, trapped between Derpy's gray canyon, my cum just as trapped. I could feel Derpy pressing down on the top of her breasts, and trying to shake them back and forth, but there was too much mass to make a difference. Not that she needed to do anything; just the sheer feeling of this impossibleness, this softness and weight and squeezing and comfort, was enough to drive me out of my mind with pleasure. And beneath it all, I was still utterly touched that she had done this willingly for me, to help me heal. Not only was I living one of my horniest dreams... I was happy, too.

Derpy's breasts stayed gigantic for the next four hours, and I basically spent the rest of my stamina in one of three places: Underneath her, fucking her sensitive tits from below, filling the room with more milk... Atop her breasts like a hammock, letting her mouth play with my cock at her leisure... And behind her beanbag-sized buttocks, massaging the cutie marks and hotdogging my cock between them. Naturally, the majority of the time was spent in the first position.

I managed to last until I could visibly see her breasts shrinking as the potion wore off. With our tired bodies, we managed to flip her over so I could lay on top of her receding bosom, using her body like a gigantic set of pillows as we both drifted off to sleep.

The cleaning crew was going to utterly loathe us in the morning. Milk was everywhere. But they were the ones who had challenged us to do our worst.

As sleep claimed me, I looked at Derpy's sleepy face. She had a smile like it had been permanently etched onto her face.

It was an alien concept to me, the idea that what made me happy could make others happy too. I'd gone through life assuming that my kinky shit would be too much of an imposition on the girls I liked, that my pleasure would be a zero-sum game. But Derpy, Trixie, and the others... They were determined to prove me wrong and put an end to my sad-sackery.

Best of luck to them. Though this was definitely a major victory in the long war.