Author's Note

Minor evilness warning: this bonus chapter features Adagio and Aria plotting and obtaining "revenge" on Trixie for getting them knocked up. While everything is consensual, the villains remain jerks about setting up situations in which it is likely to be given; they are certainly not as interested in equal relationships as our heroes, and enjoy the power they have over Trixie via her pride and arousal. If you're potentially triggered by such things, maybe give this one a pass.

Chapter-Specific Tagging: double penetration, weird seapony cocks, revenge sex, consent to unusual conditions while aroused, impregnation, cross-species impregnation

Bonus Chapter: In Which Trixie Gets Her Cum-Up-Ins

The Great and Powerful Trixie enjoyed her position on the swim team, of course. Not only was she rightly the captain, her team had reclaimed its rightful place at the top of the local rankings after that unfortunate few months when her teammates Aria, Adagio, and Sonata were all out of action due to their...Trixie couldn't be bothered to remember the lame story they'd told the other schools, really, since she knew the real reason.

She'd briefly worried they would be so upset that she'd singlehandedly foiled their plans to get their magic back via sex and take over the school that they'd quit the team in pique. But only Sonata had left, and then only to do whatever it was Sunset was doing after school. Why anyone would rather hang out with her than with the Great and Victorious Trixie was just impossible to fathom. But she supposed Sonata had always been a bit clueless.

Trixie enjoyed swimming so much, in fact, that she did not even object when Coach Sea Swirl had them keep up their daily practices even after the end of the season, so they wouldn't get too lax over the summer. Trixie did intend to keep swimming in college, after all. She found herself thinking, on the last day of practice before summer vacation, that she should take out a membership at the pool for the summer, and keep coming back, on her own time.

There was one thing, though, Trixie didn't like about swimming. It wasn't the attention of the slightly younger boys who invariably seemed to be in the free swim area as they practiced - Trixie knew she was stunning in her swimsuit, and enjoyed their stolen glances when they thought she was concentrating on her strokes. But the experience always left her distractedly horny by the end of practice, and made the trip back to her house and private space to relieve her tension stretch long.

She dragged her heels a little heading towards the shower on that last day. Though Aria seemed to be cooling down in the free swim area for a bit, Adagio's suit was already sitting on the bench and Trixie could hear the shower running when she got to the locker room. She thought about skipping the shower; she was even hornier than usual today, and she was worried Adagio might notice. But then she thought about taking the bus home wet both between her legs and everywhere else, and decided to go for it anyway. She pulled her own suit off, briefly admiring her perfectly handful-size breasts, and grinning at her ideally tight rear as she passed the mirror. Yes, she thought, those boys were lucky the Pert and Perfect Trixie practiced in their pool.

Still smiling, she entered the shower room. Adagio was under the center spigot, facing away from her. The siren's massive mane hid most of her, but Trixie couldn't help but notice one of her hands seemed to be busy between her legs. She wondered if she'd noticed the boys looking too, and was shocked the siren was so brazen as to masturbate in the public shower!

Before she could say anything, though, Adagio turned around. Her eyes were half-closed, her mouth half-open, and her hand was working not between her legs, but rather in front of them. Because from Adagio's crotch sprung a gorgeous, exotic dick. Yellowish like the rest of her skin, it looked like neither a human cock, nor the pony member she'd seen spying. Instead it was sinuous and looked slick and wet, barely even fleshy. Where the pony cock had a medial ring, it had what looked like small ridges all along the middle, and Trixie couldn't help but imagine what they'd feel like inside her. The head was neither flared nor bulbous, but tapered nearly to a point.

"T-Trixie! I didn't expect you back!" Adagio stammered.

"When did you get that?" Trixie's eyes were glued to the glorious member. "And why does it look like that?"

"I drank one of the potions," Adagio said, "just to see what it was like. But it did the same thing to me it did to Sunset. Now if I get too horny, it comes back." She sighed. "I couldn't help it, swimming next to you the whole time, the way the suit hugs your figure..." Her eyes drifted hungrily from Trixie's flawless breasts to the perfectly formed light furred patch between her legs. "I thought I'd finish before you got back."

Trixie couldn't believe her luck. Even for her rightfully fortunate life, this was unusual. Here she was, horny as a horse in heat, and Adagio was right in front of her. With a glorious-looking cock. Turned on by her.

"Well," Trixie said, taking Adagio's free hand and leading her towards one of the changing stalls with a door, "you're in luck. The Generous and Giving Trixie is willing to help fix your problem, since she unintentionally caused it."

Trixie made sure to wiggle her Platonically-formed rear as she walked. She closed and latched the stall door behind them, then lay on the bench, spreading her Smooth and Lustrous Thighs to reveal her Wet and Eager Pussy.

"Mount me with that unwelcome thing," she said in her best voice of command, "we'll take care of it."

"But..." Adagio moved, but hesitantly.

Most people who knew Adagio would have been suspicious, at least subconsciously. Of course, being caught masturbating in the shower is awkward, but Adagio was never so hesitant or quiet. The Commanding and Imperious Trixie, however, a girl so domme she didn't even have a subconscious, was merely vexed.

"Come on," she wiggled her assets again, "your captain's given you an order!"

"But it was the red potion," Adagio said.

"The new one? The one that works?"

"Yeah, that one."

Trixie bit her lip. Her Pert and Perfect Pussy called out to her that it really, really wanted something inside it. Preferably something that looked slick, with ridges. But Sunset had told them about the red potions, just to avoid any more mishaps. If Adagio's cock were inside her, the magic would advance her to maximum fertility within a few minutes, then keep her there for at least a day. If Adagio came in her, she'd be pregnant, apparent non-humanity of the cock be damned. In fact, it'd maybe create...

"Tell the Great and Powerful Trixie what she would have," she said. "An awful human pregnancy, or easy eggs, like you did?"

Adagio shrugged, member still fully hard and enticing. She stroked it gently with her hand, apparently without realizing it. "Probably the eggs. I don't think there are male sirens, so we're cross-fertile with basically everything, but always give birth to full siren eggs. I bet it'd work the same way for you."

Trixie considered. Even if she were totally fertile, surely if Adagio pulled out, and came on Trixie's Sexy and Firm Body, then she'd not get pregnant. And if it somehow went wrong, how bad would it be? A few months carrying eggs, not even visibly, then just go down to the river and be done with it.

She glanced down at Adagio's magical prick again. The ridges were calling to her. She craved it.

"I understand if you don't want me to follow your order, now that you know," Adagio said.

That did it. Trixie was many pairs of adjectives, but she hated people not following her orders.

"You heard the order," she said, raising up and parting her Firm and Inviting Ass to spread and reveal her sex even further, "you will fuck Captain Trixie senseless, Adagio. But warn her when you are close, so she may decide how she will allow you to finish."

Adagio said nothing, but a moment later she felt her nether lips part as the thin tip of Adagio's benthic cock spread it gently. Slowly she widened around it as the thicker base entered her body. Then the ridges pressed into her. She felt every one massage her passage as Adagio sunk deeper and deeper. and she began panting at the sensation, lost in the feeling, like the waves of the ocean massaging her insides. Finally she felt Adagio's heavy balls jiggle as they pressed against her, the tip of the sublime dick buried all the way inside her. S

Slowly, Adagio began moving, and the tidal sensation was back. Trixie could barely think, barely keep her eyes open, when there was an unexpected beep from Adagio's watch.

"Two minutes," she said, voice slightly uneven, "you're fertile now, Trixie, for sure. Should I pull out?"

"A...are you c-close?" Trixie managed.

"Not yet."

"Then keep going!"

Adagio began thrusting harder, pressing Trixie's Firm and Enticing Breasts hard against the slick bench, unintentionally rubbing her sensitively firm nipples when she pressed back up, desperate to keep the wonderful shaft inside her. Then, just as they were settling into a rhythm, they heard rushing feet in the main shower room, and stopped, silent.

"Adagio," Aria called out, "were are you?"

Adagio waited a moment, then called out. "In the stall, but I'm--"

Before she could finish, Aria crawled under the stall door and stood.

"Adagio, it's back--" she stopped as she saw what was happening in the stall.

Trixie, too, was taking in the sights. Aria was also naked, her body inferior to Trixie's own in its thinness, but standing from her crotch was a cock even more appealing than Aria's. It was of the same general form, but slightly thicker, and the ridges extended further along the length. Plus, Trixie thought that Aria's color was significantly more attractive, and a better match for hers, than Adagio's.

Not, she had to admit, that she was unhappy with the siren currently buried in her to the balls.

"I'll help," Adagio said, reaching out towards Aria's cock.

"No," Trixie said, "Trixie, your Helpful and Generous Captain, will help you both. Aria, you may have the honor of fucking Trixie as well, but you need to wait your turn."

"Uh, sure, I guess," Aria said. "I'll wait to get some real pussy instead of Adagio's hand again."

"Good," Trixie said, clenching said pussy around Adagio's glorious cock, "proceed, Adagio."

Trixie had to admit that Aria watching made the whole thing even more delicious. She could tell she was practically drowning Adagio's cock with her juices, and Aria was gazing slack-jawed at where the other siren was plunging in and out of her perfect azure body. The sensation overwhelmed her, and she could feel herself getting close, so close, to a mind-shattering orgasm...

"I'm very close," Adagio said, "tell me where you want it."

Trixie was too close to even think about any other answer.

"Don't you dare leave," she hissed.

"But I'll--"

"Give me your stupid fish babies, just don't stop fucking me!"

As soon as Trixie said it, she felt Adagio hilt in her again, then each of the tiny ridges swelled, like the flare on a pony cock. It was far, far too much for the Overstimulated and Randy Trixie. She shuddered, clenching her pussy on her guest, as she fell into orgasm. She felt the pulses as Adagio pumped her - certainly fertile - body full of seed. She even felt a little pinch with each one, and realized the thin tip of the siren's cock was gently parting her cervix, just enough to spray the cum directly into her womb, past her body's last natural barrier to fertilization. As she realized just how fucked she was, literally, she discovered it didn't matter; if anything, she came harder.

Finally her orgasm faded, and Adagio's ridges fell back as the siren pulled out, panting. Almost none of her cum followed, but her still-hard shaft was dripping with its own secretions and Trixie's generous fluids. As for Trixie herself, far from being done, she craved more. Luckily as she came to and refocused her eyes, she saw Aria's member, ready and neglected, right in front of her.

The Full but Randy Trixie rose. Was it her imagination, or could she feel Adagio's sperm slosh around inside her as she did? Regardless, even as she got to her feet, none of it dripped from her pussy; her cervix, far from keeping it out, seemed to be holding the seed inside her. In front of her, the two sirens stood, both ready.

"Not done yet, Adagio?"

"It usually has two," she said.

Trixie found herself feeling empty, now that Adagio's cock had left. She decided that she wanted to see just how full she could feel.

"Well then, it seems the Helpful and Giving Trixie still has some work to do here. Lie on the bench," she ordered Adagio, "face-up."

The siren did, her member standing proud above her. It still glistened with fluids from their frantic mating. Trixie grinned, seeing that. Just to be sure, she reached between her legs and scooped a generous helping of fluid from her still-ready pussy on to her fingers, then carefully spread it over her pucker. She put one finger slightly inside, to make sure it moved easily, then, satisfied, squatted above Adagio, slowly inserting the girl's pecker into her ass.

The thin tip, gradually thickening, and the liquid coating the cock made it slide in easily, and Trixie gasped at this new way of being filled. Though she couldn't feel the ridges as well once they passed her asshole itself, they felt wonderfully novel as they passed through it, and her stuffed bowels made her both even hornier, and eager to get the second cock into her hungry pussy.

She spread her legs, and looked to Aria.

"Well, what are you waiting for? Trixie is ready for your cock."

Aria came over, delicious pink member poised at Trixie's entrance.

"I'll warn you when I'm about to cum," she said.

"Just fill me up," Trixie panted, clenching her ass around Adagio, "I can't get any more pregnant." Just saying it made her shiver with inexplicable pleasure.

Grinning, Aria plunged all the way into her in one smooth stroke, bottoming out inside her. The thicker cock made Trixie gasp, and her thrust pushed her down firmly onto Adagio, sandwiching her between the two girls. Both pairs of balls pressed against her, feeling heavy with seed.

"Yesss," Trixie moaned, "use the Ready and Willing Trixie to sate your magical lusts."

As she lay between them, they did so, eagerly. Both sirens pounded her, frantic, lifting her body first into the air, teasing her asshole, then pressing her down, filling both holes and stuffing her to the limit. Trixie had never managed to make herself multi-orgasmic before, but she thought she was now, riding a wave of pleasure that seemed to crest and fall, but never abate, like the ridges, or the sea.

Then, finally, through the haze of pleasure, she felt those ridges bulge inside her, and she came to rest, fully impaled by both sirens, and the wave peaked again as she knew what was about to happen. Simultaneously, Aria and Adagio unloaded in her. She felt the pulses in her rear, but nothing else as Adagio blasted her nerveless bowels full of wasted seed. But in her pussy she felt every delicious wave pass up Aria's shaft and felt the little jolts of half-pain as, once again, a siren's perfectly tapered cock deposited eager seed directly into her fertile womb.

Finally, as Trixie was wondering if it was healthy to cum for so long, Adagio's member suddenly vanished, leaving a steady trickle of her own cum dripping on to her flat belly. Trixie felt Aria's ridges lowering, and wondered if she would have the strength to help her teammate with her second load. But before Aria could withdraw, Adagio reached a hand lazily around and inserted two fingers into Aria's pussy, hidden behind her magical cock. Trixie didn't have the chance to say anything, or even really think. Aria let out a long moan, and pressed forward hard, driving Trixie down firmly on to Adagio's prone body, the siren's generous, pillowy breasts pressing into her back. Aria's ridges firmed up again, and Trixie discovered she could indeed cum a little longer as the second orgasm shook the siren.

This one was different. As with the pony cocks, one long spurt of seed flooded Trixie, surging into her already full womb. She felt it bulging inside her, the seed too much to fit without distending her belly. And then, only then, did she truly understand that she'd told the sirens, ordered them, to impregnate her, and they had.

Of course, being Trixie, it took her almost no time to decide that this had been a wonderful idea all along.

"That was a strange revenge," Adagio said to Aria once they were out of earshot, "I think Trixie enjoyed it at least as much as we did. And she doesn't even know it was revenge."

"Everyone's a critic," Aria sighed. "I think it was perfectly poetic. She got us knocked up, so we knocked her up. But better! In a decade or two, she'll get to know she helped return us to our rightful place of power. And she even told us to do it!"

"You love your clever schemes too much. A simple plan's a better plan."

"Like your simple plan that got us stripped of our powers by a bunch of useless pony-lites? But fine. You want simpler revenge? Think of how much you'll be able to make her beg the next time she gets horny."

Then, Adagio smiled.