Author's Note

This chapter contains: futa, mild ball fondling, urethral sex, bladder inflation, cum going the wrong way (sort of all the way through, kinda), sisterly love and Celestia making the news.

Morning Wood (futa, urethral sex)

Celestia had a bad case of morning wood.

A common occurrence across Equestria, most ponies would call it normal, if it weren’t for the fact that she didn’t have a dick when she went to bed last night.

“LUNAAA!”

The annoyed and still somewhat groggy alicorn didn’t have to wait long before a flash and accompanying pop signaled the arrival of her sister. “What, dear sister of mine, causer of mass panic at the end of my peaceful night?”

Instead of saying anything, the tired no-longer-a-mare pulled her bedsheets aside, revealing a dark grey mass of horse-meat rising up between the small swells of her teats, easily big enough to land her a cover page on a porno mag. The solid member throbbed in the cool morning air, the heat from the solar goddess’s blood pumping through the turgid rod causing the air to distort around it. Just beneath her new stallionhood lay a loose sack, the solar diarch spreading her legs to let the heavy balls flop onto her messy tail.

“You interrupted my night and called me up here in a manner that caused the staff to panic to show off thy dick?” Luna deadpanned, unamused.

“I didn’t have one when I went to bed last night!” Celestia snapped, her balls twitching as she tensed, a spoonful of pre oozing from her pronounced urethra.

“So you sought to accuse me for it? Here I was, ready to assist you with it, but thine accusations sting.”

Celestia sat up, dick slapping against her chest with a wet slap. “I never accused you, sister! I was merely annoyed with your lack of empathy, and honestly, I’m not awake enough yet to be dealing with this. I’m sorry, Luna.”

Luna stared at Celestia’s shaft for a moment, watching it throb in the cool morning air as she thought. “Apology accepted. I know that I too am not the most civil fresh out of bed.”

Celestia smiled, opening her forelegs for a hug before thinking better of it. “You said you could *yawn* help me with this?”

“Yes. I know the remedy for your condition, though we have precious little time before you need to raise the sun to prevent more panic.” Stepping forward, Luna lit her horn.

“Thank you, Luna, you really are the best sister a po-EEP! Luna! What are you doing!?”

Luna looked back up with a confused face, her magic still gently rolling the heavy balls in its grasp. “What? Tis inducing orgasm not the quickest way to relieve your waking stiffness?”

Celestia grunted, biting her lip at the alien sensation of having her new balls fondled. She had to admit that the tingle of her sister’s magic that was encompassing her sack felt heavenly, her stallionhood agreeing as it somehow grew even stiffer, a large dollop of pre forming at the tip before dribbling onto her barrel. Focusing through the foreign pleasure, she gasped, “No, I mean, yes, but no, I was hoping you would help me remove the organs entirely. To restore me to being fully mare.”

With a soft whump, her balls fell back to the bed. “You mean to tell me that you wish to waste this opportunity that you’ve been given? Also, you are fully mare.” Lifting Celestia’s balls back out of the way, Luna demonstrated the fact with a magical flick to her clit. “You have just been endowed with the addition of a dick.”

“I-”

“A beautiful specimen, with a mouthwatering pair of testes too, and the first thing you want to do is waste the opportunity you’ve been given.”

“Well-”

Luna held up a hoof. “And, if this is some form of transmutation spell that has been placed upon you it will take days to formulate the counterspell, so at least until then wouldn’t it be advantageous to enjoy what you have been given?”

Celestia sighed, closing her eyes to try and think past the tingling pleasure of Luna holding her balls. “You are right, sister, as always.”

“I know.” Smugly giving her sister’s balls a gentle tug, forcing Celestia’s eyes to cross momentarily as she bit her lip, Luna hopped up on the bed. “Now, unless your desire is to give our subjects quite the eyeful, let us see about restoring some of your modesty before you must lift the sun.”

Suddenly feeling vulnerable, Celestia meekly asked, “What are you going to do?”

Casting a quick spell to lube Celestia’s length, Luna gently laid her sister back down before straddling her. “I am going to make both of us feel wonderful, just as I have before.” Positioning the wide flare where she wanted it, the Lunar princess grinned. “The only difference is that this time, we have something more to work with.”

With no more warning, Luna leaned back, Celestia’s stallionhood pressing just above her clit, the flare mashing into the flesh there before finding a hole. Both ponies let out a loud moan, Celestia as she experienced penetrating a clenching, tight hole for the first time and Luna as her urethra was spread deliciously around the hottest dick she’d had the pleasure of experiencing.

“Oh, sister, you are so warm!” Luna moaned, the incredible heat emanating from the solar diarch’s wide flare offering a unique addition to an otherwise familiar experience.

Celestia could only grunt, the intense, unfamiliar sensations coursing through her causing her to clutch at the bedsheets and grit her teeth as her pleasure sensors tried to sort themselves out. Her balls knew what was going on though, the heavy orbs clenching in their sack at the pleasure of penetrating something so tight.

With a pop that made both sisters moan, Celestia’s flare slipped past the sphincter into the spacious cavity of Luna’s bladder. Readjusting her stance, the smaller sister eased herself down until the entrance to her impossibly stretched urethra bumped against the thick ring of flesh near the base of the solar scepter.

“Mother’s teats you’re almost painfully tight, Lu!” Celestia gasped out, her entire body spasming and squirming at the crushing grip of her sister’s practiced muscles on her new nerve endings.

“Neigh, I have not been tight for a dozen centuries. Thy dick is simply more filling than most.”

Even as pure as her little ponies believed her to be, Celestia was well aware of just how large her current member was in comparison with even the larger stallions. “Most?”

“Indeed. While your cock is most impressive for a pony, the larger dragons sport an appendage large enough that even you could not fit it within thy cavernous ass.” In lieu of giving her sister a chance to respond, Luna abruptly rose, forcing a duet of moans at the delightful friction. Stopping only when Celestia’s cock threatened to pop out, she added, “Though proportionally your new appendage suits you well.”

Celestia blushed at the compliment, though her gratitude went unsaid as Luna unceremoniously dropped, forcing a moan from the both of them as the momentum of Luna’s body forced the medial ring through. Luna’s breath hitched as Celestia’s flare slamming into the back of her bladder, her plush cheeks meeting white hips with a clap.

“Ooo~ Tis a perfect fit.” Grinding back and forth, Luna admired the prominent bulge just above her navel, loving the shear heat radiating from her sister’s shaft and warming her body from the inside out.

“Oh heavens, Sister! I don’t know how much longer I’m going to last if you keep doing that!” Celestia could feel her balls clench at the shockingly arousing sensation of being hilted within somepony, the back of her little sister’s bladder not quite a cervix, but stimulating all the right nerves nonetheless.

Pulling up until she was once again poised at the tip, Luna smirked. “Thank you, though wasn’t that the point?” Slamming down again, a loud ‘plap’ sounded out as their bodies met, both alicorns grunting. Again and again, she repeated the motion, the sounds of their union only overpowered by the moans of pleasure.

“Lulu, I’m-“

Lighting up her horn, Luna gently grasped Celestia’s twitching balls again, softly massaging them in her tingling aura. “I know, Celly, I know.” Feeling the heavy grey sack trembling in her aura, Luna slammed herself down one last time. “That’s it, just let yourself release within me.”

Her entire body clenching, Celestia’s balls practically yanked themselves out of Luna’s grip as they came for the very first time. “LUUNAA!”

The darker alicorn was not far behind, the sensation of her sister’s flare expanding to seal off her bladder before jet after jet of intoxicatingly hot cum bathed her insides proving more than enough to send her over the edge as well.

Their cries combining into perfect harmony, the sisters held each other as they rode out their orgasms. As spurt became dribble and clench became twitch, their heavy breathing was the only sound that filled the room.

Basking in the afterglow, Luna attempted to bend down and kiss Celestia, though the prominent swell of her stuffed to capacity bladder prevented her from getting close enough to make contact. Celestia could only stare in wonder at the size of the bulge, the thought of her own balls producing enough to make her sister look five months pregnant giving way to the taboo thought that with her own balls she could now make her sister pregnant for real.

“Hold one moment, let me just…”

Watching Luna place her forehooves on the bulge, Celestia took too long to realize what her sister was planning before Luna bore down with a grunt.

Unlike with her previous suiters where the added pressure forced the cum to bubble out from around their dick and make a mess she could clean up as a final thank you, Celestia’s dick was just big enough and still flared enough to form a tight seal.

Left with nowhere else to go, her own cum was forced back down her dick, taking the alternate path through her brand-new prostate up to her bladder.

“L-LUNA!”

Celestia’s bladder, practically untouched as it was, took only moments to fill to it’s maximum capacity, a small bulge forming between her soft teats. The cum just kept cumming though, and seeking a pressure release, squeezed through the much tighter of her two urethras to splatter against the back of her heavy balls and pool around her dock.

Finally empty, Luna pulled off of Celestia’s softening dick, though she paused when she didn’t see the mess of white around her older sister’s sheath that she expected. There was a huge mess of white around her tail though, and after doing some investigation by means of lifting a pair of heavy balls and flopping them across the big pony’s leg, she watched as another dollop of cum dribbled from Celestia’s virgin urethra.

“Celly, did I just force thine own cum through you?”

Looking down her stomach at her sister, Celestia nodded. “Yes, yes you did. I would have appreciated some warning, that was rather… Intense.”

Giving a long lick from dock to leaking urethra, Luna grinned. “Would you not wish to do it again sometime?”

Blushing, Celestia looked away. “Sometime, perhaps. Time. Time! THE SUN!” Leaping from the bed, the Sun Princess fired off a litany of spells to clean her tail, flatten her coat and straighten her mane. Throwing on her regalia, she trotted toward the balcony as Luna shook her head and teleported to her own.

Standing before the balcony doors, her length finished retreating into her sheath just as the clock struck, her relief at the crisis averted allowing her to put on a beaming smile before throwing open the doors and raising the sun to the cheers of the ponies awake at this time of day.

Walking into the dining hall for breakfast, Celestia’s good mood deflated at the expression on her sister’s face. “What now, sister? What else could there be today?”

“Behold.”

Celestia caught the newspaper that had been tossed her way, its lightness betraying it as a special edition. As soon as she saw the cover her mouth dropped open in shock.

PRINCESS OF THE SUN NOW PRINCE?

Beneath the massive headline was a full-page color picture taken from the perfect angle to capture both her cutie mark and the heavy set of balls hanging beneath her, the head of her cock just poking out of her sheath.

“Fuck.”