Clinks, clangs, rattles and bangs echoed in the depths of the busy workshop in Mobius, as the owner & operaive was hard at work.

Tails was rarely bored or had nothing to do in his home; the vulpine was always tinkering, building, designing or experimenting with something, either for his own benefit, for his friends to stop Eggman, or the benefit of the whole world.

This time though, it was purely for science... And partly for fun, both mostly for science.

It was a hot day and Tails' workshop was quite warm and stuffy. He was working on a new invention which would help to create a more environmentally-friendly mode of travel: The Hovercar.

It wasn't as much of a challenge as he was expecting. It was a simple modification to his previous hover technology, and the vehicle was nearly finished, he just needed to fix the last few bits.

Once he was finished here, he'd be able to keep up with Sonic with ease, and make the trip to the outer parts of Mobius and back so much quicker.

It was hard work, as always, but he knew it would be worth it in the end. It often was.

Unbeknownst to the foxy genius, however, his work was about to have an unexpected, but very much appreciated, break from the routine.

Turning a screw, connecting a wire, twisting a bolt and welding a panel, the vulpine was hard at work in his station, and the noises drowned out the additional sound of the door opening and closing quietly, and the soft footsteps approaching from behind.

In his current position, bent over with his lower half sticking out and his upper half buried inside the vehicle's insides, the yellow fox was vulnerable.

Tails' twin namesakes were swishing about gently behind him, the bushy appendages twitching and wagging slightly, back and forth, leaving him oblivious to the figures moving towards him, sneaking up slowly, trying not to make a sound, as they drew nearer and nearer.

That was, until it was too late for him to react.

"What the- whoa!" The fox exclaimed, feeling something firmly grasp his shoulder, pulling him out of the vehicle's components and spinning him around, pressing his back against the invention.

And he got back to his bearings, what his eyes revealed to him really turned his day upside-down.

"A- Amy!? C- Co -Cosmo!?" Tails gasped in shock, his mouth open and his eyes wide with surprise.

Sure enough, both the pink hedgehog and the green Seedrian were both standing in front of him, the former having her hands on his shoulders, while the latter stood behind her with her hands behind her back, both if them looking at him with a sweet smile on their beautiful faces.

In fact, overly-sweet smiles. And for good reason.

To his complete shock, and a strong sense of delight buried underneath that powerful sense of surprise, both of the girls were wearing exactly the same as him:

Nothing.

They stood before him in their birthday suits, and if the sultry looks on their faces were anything to go by, it seemed like they weren't exactly shy about showing off their bodies.

"Hello, Tails~" Cosmo smiled sweetly, walking up to stand by the hedgehog's side, as if all was normal.

This whole scene had an air of familiarity to it, and the memories of what happened time started flooding back to him.

Despite his flustered state, the fox turned his head to look at the calendar on the wall, and noted to date that was circled on it.

Specifically, a red circle with some pink hearts and green flowers drawn on it; a reminder he made for himself about what would be happening around this time of year, which turned out to be right now.

"O- Ohhhh..." He muttered, daring to look back to his friends with shaking nerves. "I- It's y- your... Time, a- again?"

It was pretty impossible to forget what happened last year, when these two entered his workshop back then, as well. The last time this happened, they quickly got into a threesome, and later transpired into a foursome with the arrival of Blaze.

As he found out the hard/fun way, natives to Cosmo's planet went into their own version of estrus, in which they would find their most suited lovers and show them a really good time, whether they were ready for it or not.

Speaking of, the Seedrian nodded slowly, and her eyes looked him up and down with an unashamed gaze.

"Yes, and you know what that means~" She replied, reaching out and cupping the vulpine's chin. "I require to commit reproductive activities with my chosen partner, and it benefits to include additional participants. I would like you and Amy to engage in coitus with me once again."

The pink hedgehog giggled beside her, and without even needing to be told, she wrapped her arms around Tails's neck, pulling him in for a deep, passionate kiss, making the fox's eyes widen even more.

It wasn't something he was ready for, but also not something he wanted to fight against, either.

Not for the first time in his life, he pitied his best friend for missing out on how amazing of a kisser Amy really was, and it wasn't long before his hands found their way behind Amy's back, helping him to return the favor.

They remained like this for several moments, their lips meeting tenderly as their tongues danced in between them, and Cosmo watched them with a deep level of interest.

The sexual foreplay was turning her on even more than her natural state already was, and the effects were immediate.

More pheromones released from the plant-alien's body, quickly making their way to her two companions, affecting them in the same manner; their kiss was getting even deeper and hotter, and their hands began travelling south to explore the other's vessel.

The girl could feel his hardening erection exiting its sheath, the firm member starting to make its presence known to this little group, whereas the boy helped himself to a handful of pink buttock, squeezing & fondling her meaty cheek like it was his property.

Amy moaned into the kiss, and her hand drifted to start feeling up his length & girth, and she was pleased by the reaction his penis was making.

Just like last time, she was handling him like a pro, and it made Tails curious as to whether or not she had done a lot of practising by herself, probably in preparation of the day she would finally win her beloved blue hero's heart. Not that it mattered now; he was getting of her experience for himself, and he was sure to relish it as much as he could.

However, to their reluctance, their lungs were starting to fault from how long they had been making out like this, so they had to break the kiss and pull away, panting heavily as they looked into one another's eyes.

"Haaahh... Haaaa... You're... A good kisser~" Amy complimented, still rubbing his length, her face flushed with arousal.

"Thanks... Haaahhh... Y- You too..." Tails retorted, rubbing her buttock tenderly like he was petting a domesticated cat. "S- Sonic's... Missing out~"

"Screw him." The pink hedgehog declared with a sexual growl, leaning her head against his. "He can't handle me, anyway~ Not like you can~"

The vulpine gulped at the flattery, and his eyes darted to Cosmo, who was watching the spectacle before her intently.

She took notice of his sight shifting to her, and she took that as her cue to really get the fun going between them.

"Allow me to add some flavor~" The alien declared, moving up to her foxy lover and placing a hand on his cheek, before closing her eyes & leaning in as well.

Tails didn't resist as his lips met hers next, instead closing his own eyes to savor the taste of her mouth. And savor it, he did.

As he remembered, the Seedrian's lips, breath & tongue were all very fruity, making him feel like he was making out with a fruit salad.

There was mango, cherry, peach, kiwi, pears, apples, bananas, pineapple, all sorts of delicious edible botanical matter, and he got to enjoy them all.

She moaned into the kiss as well, wrapping her arms around his neck and squishing her plentiful bosom against him.

Naturally, he didn't hesitate in taking the initiative; his hand moved up to her breast and he gave it a soft, gentle squeeze, making her moan into his mouth.

The feeling of her unique flesh was amazing, just like the rest of her body. Her tits were just the right size for him; not excessively big like Vanilla's but also not below average like Blaze's, and the perfect handful for his palm.

His thumb rubbed over her sensitive nipple, causing even more of her sex-inducing pheromones to enter the air.

As their mouths mingled, as their tongues fought each other for dominance, Amy could only watch the scene with an incredible sense of arousal, giving both her clit and one of her own nipples a few teasing strokes and squeezes.

It was so hot to watch the two of them get together, and it was only adding to her lovesick desires.

"Ahhhh~! That looks so hot~!" She declared, not wanting to waste another second to get back in the fun, and knowing the perfect way to make that happen.

Getting behind the other female, the hedgehog dropped to her knees and licked her lips when she was face-to-face with her target.

She didn't hold back as she grasped the alien's buttocks with both hands and quickly spread them apart, briefly feeling a little waft of her natural botanic scents, mixed in with a musky scent of her anus, going straight to her face, which only heightened the overwhelming need to fuck even more.

As such, she plunged her face into Cosmo's butt, getting her tongue crash-landing inside her puckered asshole, and started licking away at it, sending a pleasurable shiver down the green-skinned beauty's spine.

"Nnnnghhhhh~!!" The Seedrian moaned loudly into Tail's mouth, feeling her whole body shake in pleasure at the stimulation both ends of her were facing.

It also came with the added benefit of making her grasp Tails's cock even harder, helping him get the same amount of pleasure that she was getting from their lewd activities.

The fox's eyes rolled back into his head, and his hips instinctively thrusted forward into the Seedrian's grasp, as if to further invite her to do as she pleased with his manhood.

Pleased with the reactions of her work, or perhaps still completely oblivious to what was going on between them and was just giving in to the powerful sexual urges, Amy continued to rim her friend's anal passage with unrelenting excitement.

As the wet muscle rammed deeper into her backdoor & got more comfortable in the surroundings, Cosmo felt her legs start to give in to the sheer pleasure, so much that she had to break the kiss & hold onto Tails's shoulders tightly, just to avoid falling over.

"Gaaaaaahhhhhhh~!!" She gasped, panting heavily and drooling slightly as the pink hedgehog ate her ass out like this, feeling her loins burn all the hotter,

Her pussy was literally dripping wet, the juices starting to trickle down her legs and stain the floor, and the vulpine couldn't help but take notice.

Namely, because the scent was too strong for his nose to not pick up on.

Without even needing to be prompted or guided, Tails helped the faultering alien down to her own knees & hands, and positioned himself on his own knees, ready to take control of the situation now.

In her current pose, Cosmo could still get her butthole eaten out by the pink hedgehog at the back of her, while her face was ready & available at the front.

It took her a moment to get used to the feeling of the incredible rimming, but once she had gathered herself again, she was met with a pleasing sight of her own; Tails's massive erection, pointing right at her mouth.

But before she could ask, or even respond at all, she also felt the fox's hands grasp the top of her head, pulling her towards the proud boner.

It almost surprised her to see him acting so dominantly, but she didn't have any complaints about it. Instead, she opened her mouth wide, closed her eyes, and allowed the canine to thrust his member right into her oral cavity.

"Nnnnnghhh~!!" The green-skinned female moaned in a muffled voice as her mouth was completely stuffed, wrapping her lips around the intruding phallus and swirling her tongue along the shaft, tasting every last bit of it.

"Ohhhhhh... C- Cosmo~ Th- That's... S- So good~" Tails praised, his grip tightening slightly on the back of her head, and his hips gently thrusting into her fruity-scented mouth even more.

His praise didn't make much of a difference to her, though, since her mouth was being used as a fleshlight.

Cosmo had no problem taking his entire length inside her mouth and throat, and it wasn't long before his balls were smacking into her chin with every thrust, as he was using her face like a cheap whore on the street corner.

The feeling of having two of her orifices filled like this made the Seedrian moan even louder, the sounds muffled and barely heard over the loud slurping noises Amy was making with her oral ministrations in her anal canal.

She was starting to feel overwhelmed, but she managed to hold strong. She knew that they had plenty of time to enjoy themselves, and if they were lucky, they'd even be "interrupted" again like the last time this happened.

She could also feel her arousal building, and she could only wonder just how far she would end up going, before she had to release it all.

The hedgehog eating her out was clearly getting enjoying her taste back there, as evidenced by the increasing intensity in her movements, and Cosmo could only hope that it tasted as good, or as bad, as she wanted it to be.

Likewise, the cock in her mouth was starting to twitch, and the fox that it belonged to was moaning out loud, so she could tell he was getting ready for his first orgasm of this session.

The thought of that being the case only excited her all the more, and she started to suck his dick even harder, using her tongue as much as she could to give him extra stimulation, making his hips buck and his cock pulse in delight.

"Ooooooohhhhh, C- Co- Cosmo~!" Tails gasped, his legs shaking slightly and his tail swishing behind him as the pleasure kept on building, making his balls start to tighten. "I- I'm... N- Nearly theeeeeeeerrrreeeaaaaaaaaAAAAAAAHHHHH~!!"

That was the final warning, before he reached breaking point, and the dam finally burst.

"Aaaaaaaaaahhhhhhhh!!" The fox cried out, forcing his entire length into the Seedrian's mouth and holding her there, before shooting his load straight down her throat, making the Seedrian react a similar way.

"Mmmmmmmmph~!" Cosmo loudly hummed in delight as she hit climax as well; having his spunk inside her and feeling Amy's tongue's motions in her butthole drove her over the edge.

Her juices exploded from her cunt, soaking her thighs and Amy's face, and the pink hedgehog reacted in the exact way she both expected and didn't expect; the sudden spray of her fluids in her mouth & against her face sent her mind into overdrive, and her hips bucked as her own pussy creamed hard as well.

Her fluids erupted from her snatch and formed a puddle underneath her, staining the ground of the workshop as the trio all came pretty much simultaneously.

And after a few more moments, their climaxes slowly ended, and Tails's member popped out of Cosmo's mouth, with her gasping for air, while he and Amy were just left panting.

Despite their powerful orgasms, the three of them were far from finished with this incredible session; Tails was still hard as a rock, and the girls' cunts were aching for more satisfaction. Ideally, something to be shoved inside them and rammed senseless.