~The Ultimate Protector~

(Disclaimer: I do not own Sonic the Hedgehog or any of the characters, all credit goes to Sega. Please support the official release).

Chapter 1: New Secrets Revealed

"He's disappeared off into the forest again. I wonder what he does, he's been doing this at least once a month".

Knuckles sat in front of the Master Emerald one evening, as he usually did since it was his duty to guard it. The only time he ever got to take a break from his lifelong duty was usually when the world was in danger, and he needed to help Sonic save it.

But there was another time he was able to get away from his duty, and it didn't involve having to save the world from a crisis.

It was when he got to spend time with his boyfriend...Shadow the Hedgehog.

Knuckles and Shadow had been in a secret relationship for what was going to be four years, it had started sometime after the Black Arms invasion. The two had bumped into each other one day, and with nothing better to do, they decided to hang out.

It turned out that the two of them shared a lot in common, between their rivalry with Sonic and their shared feelings of feeling like outcasts despite having friends, they found themselves being able to relate to one another quite well.

They had both decided to keep the relationship a secret, opting to tell their friends only when they were ready for fear of embarrassment over revealing that either two could be so soft and vulnerable when they've made themselves out to be tough, no nonsense talking bruisers this whole time.

Knuckles suggested that Shadow could just meet up with him on Angel Island, since it was the most secretive place they could think of. Shadow even went the extra mile of building a small hut on the island not too far from where the Master Emerald was.

This was so they could have privacy sometimes, and also so Knuckles could have a safe and dry place to sleep whenever the weather got too bad. In those instances, Shadow would stay outside to guard the Master Emerald. Due to his alien DNA, he didn't need to sleep as much as the average Mobian and he was immune to disease, so he wasn't going to catch a cold from being out in the rain or snow.

All in all, their secret relationship was going perfectly well. But then, Knuckles began to notice a recent change. It seemed as though once a month, when Shadow came to the island, he would disappear into the forest for several hours.

Knuckles had no idea what he was even doing because when he came back, he wouldn't explain and just go about as normal. Knuckles was beginning to think something was wrong with Shadow, and that Shadow was refusing to tell him probably out of stubbornness or fear.

So finally, Knuckles decided to see what was going on and get to the bottom of it. If something was wrong with Shadow, he was determined to be a good boyfriend and help him.

Knuckles stepped off the Master Emerald alter and started making his way into the forest. He walked around looking for any sign of Shadow anywhere, that was when he accidentally bumped into an unsuspecting Chao.

"Oh! Sorry, little guy. Say, maybe you can help me. I'm looking for a black and red hedgehog, have you seen him?", said Knuckles.

The Chao nodded as it pointed towards what looked like a burrow dug into the ground not too far from where they were standing. "Thanks, little fella!", said Knuckles as he headed towards the burrow. He dropped down into it and was great by a tunnel.

That was when he heard a familiar voice making grunting noises. "Shadow? Is that you?", Knuckles called out. Before he could get a response, he started running down the tunnel until he came upon a small chamber and gasped at what he saw.

Shadow was sitting on the ground, looking sweaty and exhausted. One hand was gripped tightly around his member, which looked quite abnormal and almost alien; it almost looked like an insect's ovipositor. On the ground all around Shadow, in pools of green ooze, were these strange orbs. They were all roughly the size of golf balls, red and almost fully transparent.

Knuckles had the most confused look on his face as he gazed at Shadow, who was panting. "Shadow, what's going on here?", he asked. Shadow sighed, removing his hand from his crotch and leaning against the wall for support.

"I suppose you were going to find out sooner or later, you're not the smartest but you're certainly no idiot. Fine, I'll tell you...", he said.

Shadow then explained to Knuckles exactly what was going on, in a way he could understand. Shadow wasn't a normal Mobian, he had alien DNA coursing through his body, and once a month, Shadow would need to...lay eggs for lack of a better term.

It was something he discovered about himself after his first encounter with Black Doom. The process was triggered by his body deciding it was safe to reproduce, but Shadow was more or less laying eggs in the same way a chicken did. The eggs were unfertilized, and needed very specific conditions in order to become fertile.

Specifically, they needed to be laid inside of another being into order to become fertile. Once a month, Shadow would disappear into the forest of Angel Island, hide away in the burrow he dug out and laid the eggs until his body stopped producing them for the time being.

The eggs themselves eventually disintegrated after a few hours, so he never had to worry about it harming the environment.

"I didn't think you'd find out about this though. I kept it a secret because I thought you would be disgusted by it. I'm sorry, Knuckles", said Shadow.

As he looked off to the side with shame in his eyes, Knuckles bent down to pick up one of the eggs. It felt firm but smooth, it actually fascinated him more than anything else. Knuckles was an echidna, he knew his species reproduced by laying eggs, but he never thought he'd see any other Mobians besides birds doing it.

He could also understand why Shadow kept it a secret, who would want to know that their boyfriend could lay alien eggs...it sounded pretty disgusting, but Knuckles wasn't disgusted at all.

He looked at his boyfriend with a smile, "Shadow, you've got nothing to be sorry about. I understand why you would keep it a secret, so I don't blame you. In fact... there's something I've been hiding from you as well", said Knuckles.

"What do you mean?", asked Shadow.

"Well...remember about a year ago when you asked me if I wanted to get intimate with you in bed and I said no? And I never gave you a reason why? The reason I refused flat out...is because I didn't want you to know that I'm a...a...a hermaphrodite", explained Knuckles.

Shadow gasped in shock, he wasn't expecting to hear that. "Are you serious?", he asked.

Knuckles nodded, "Yes. I was born with male and female reproductive organs, in fact I'm fully capable of getting pregnant. I didn't tell you and I didn't want to have intercourse because you would've seen my extra female features, and I was afraid you'd be disgusted by them", he said.

There was a brief moment of silence before the two burst out laughing. Shadow then walked over and placed a kiss on Knuckles' lips, "I guess we were both keeping secrets from each other for fear of us finding one another disgusting, we're both idiots!", he laughed.

Knuckles snorted as he kissed him back, "Definitely. From now on, let's be more open to each other", he said.

As they stood there hugging, Knuckles looked down at all the eggs on the floor and he became curious. "Does it hurt when you lay all of these?", he asked.

Shadow looked down, "No, but it doing it for hours can be exhausting", he said.

Knuckles continued to look at the eggs as thoughts began to form in his mind, he was wondering if he should bring up something he's been pondering ever since the two got together.

"You know, Shadow. There's been something I've been thinking about for a while now", said Knuckles.

"What is it?", asked Shadow.

"Starting a family...with you"

Shadow was once again flabbergasted, he didn't know what to make of what he had just been told.

"You see, it'll soon be four years since we've become a couple. I've been playing around with the idea of starting a family with you in my head. Since I didn't tell you I was a hermaphrodite, I thought we would've had to adopt.

"But now that you know the truth, and now that I know you can produce spawn that need to be fertilized within someone else's body, I don't suppose...", Knuckles trailed off.

"Wait, are you saying you want me to impregnate you with my eggs?", asked Shadow.

"If that's too weird for you, then we don't have to. We can still adopt like I was thinking of doing--"

Knuckles was suddenly cut off when Shadow pulled him into a deep, passionate kiss. Knuckles moaned into the kiss as he felt his thoughts become a jumbled mess. Soon, Shadow pulled away and gazed at him lovingly.

"You don't know this, but I've always wanted to have children with you that way. However, since you were a male I knew that would never happen, but since you've told me you can get pregnant, I now plan to fill you up with my spawn", he whispered.

Knuckles felt a tingle run down his spine, "Well then... should we head back to my hut before it gets dark?", he said.

[Time Skip]

A shiver ran up Knuckles' back, Shadow had him on his knees, face down against the bedsheets, pillows under his stomach and hips helping him keep his lower body up.

Said black and red hedgehog was massaging his thighs, trying to comfort and ease his nerves since he was beginning to feel just a tad bit anxious.

"You absolutely sure you want to do this? I've never laid them inside another creature, so we don't know how your body will handle them. The last thing I would want is to hurt you", said Shadow. Knuckles could hear the slight worry at the edges of each word, he knew he was very concerned.

Knuckles was concerned as well, this would be the very first time that he not only had intercourse, but also became pregnant. And while he was excited to have Shadow's children, he was nervous and even a bit scared. After all, the eggs themselves were alien and he was just an ordinary Mobian, there was no telling how his body would handle such an unusual pregnancy.

With a deep breath, Knuckles looked back at his boyfriend. "N-no! I'm good! Just, ya know, first time doing anything like this...I am nervous, but I do want this. Honestly. Just...please be gentle with me, okay?", he said.

He tried to play off his nerves and flashed Shadow a smile as he swayed his hips from side to side. Shadow chuckled, sliding his hands up to rub and squeeze Knuckles' butt.

"Don't worry, I'll be as gentle as I possibly can, it is our first time after all", he said. His sharp canines showed in his smile, and for some odd reason the humor in Shadow's voice eased Knuckles' nerves.

"Well we better get to it then! Don't wanna miss anything out!", said the red echidna. He then reached for a lubricant bottle in the bedside table drawer and handed it back to Shadow.

A hum of approval left tan lips as Shadow moistened up his fingers, tracing and teasing Knuckles' slit for a second or two before sliding two lube coated fingers into it, wasting no time in massaging and preparing the it for what was to come. He listened as Knuckles moaned and felt him relax around his fingers.

"That's it. Just relax and let me do all the work for us~", Shadow whispered in a sultry tone. Knuckles gave a loud and long moan as his reply, Shadow's fingers sliding in and out felt so smooth and easy for him.

"Oh Chaos...I never knew this felt so nice~", Knuckles moaned under his breath.

He let his body relax into the sheets and pillows as he let his worries go, he trusted Shadow to take care of him, he trusted that he would make this go as easy and as smoothly as possible.

A few minutes of prepping went by as Knuckles started to feel more needy with every second. He started to moan and whine louder, rolling his hips into Shadow's hand while whispering and whimpering his name.

Shadow felt the heat within himself build as he watched and listened to Knuckles, the soft moans, the tight heat around his fingers and him slowly rocking his hips into the touch.

Sliding his fingers out, he listened to the whine of need that left peach lips and chuckled. "I'll be back in a second~", he said. Shadow picked up the bottle of lube and began coating his alien looking length with more than enough.

"Are you ready for this?", he asked as he moved Knuckles' hips, positioning himself against his feminine entrance and teasingly rubbed the tip against the clit.

"Yes! Please! Take me! I love you, and I want to have your puggles!", Knuckles shouted. All the nervousness had left his voice as he pushed his hips back, trying to get Shadow's member inside of him. Shadow laughed under his breath at what Knuckles just said, he had no idea if the resulting offspring would even be hedgehog or echidna, but he didn't feel like correcting him and ruining the moment.

That was all the black and red hedgehog needed to hear as he too started to push himself into Knuckles' tight heat. A hiss left Shadow as they both felt the member slide in inch by inch. Shadow was thicker than Knuckles had ever expected, but he wasn't complaining because it felt so good to him.

Shadow shuddered as he slowly thrusted himself within Knuckles, it felt so tight, so warm, so good. He had controlled his overwhelming desire and need for so long, wanting the red echidna to feel safe and relaxed, but now he was starting to feel his control slipping away as a more...animalistic or rather alien side of himself started to take over.

A needy whine from Knuckles was all it took for Shadow to lose most control to the other side, gripping ref hips tightly he began to thrust fast and rough into Knuckles' vagina.

Knuckles cried out as the thrusting started, not ready for such a rough start. "Sh-Shadow! Wait!", he stammered but there was no stopping now. He looked back at his lover, his once white sclera now an emerald green, his canines protruding as he grits his teeth and his claws long and black now digging into his hips.

He wasn't full on alien, but it was getting closer and closer to it with every thrust. It seemed as though his Black Arms DNA had fully taken over his senses, making him a bit more aggressive and animalistic.

"Shad! I-I'm, oh CHAOS!", Knuckles cried out. Shadow's aim was perfect now, after hitting the red echidna's G-spot once and hearing the cry of please that left his lips, he started aiming for it every thrust.

This was a side to Shadow that Knuckles hadn't ever see before, it was fueled by desperation and need, and while it was rough and fast, it was also good.

The lubrication had helped a lot, but the aim and timing was all Shadow's instinct. Every thrust felt filling and sent a rush of pleasure throughout Knuckles' whole body as Shadow hit his G-spot.

Shadow was in heaven too, Knuckles was so tight and wet, his moans and little cries were like music to his ears. His body was going on his instinct to breed and mate his partner below him for the first time, his need to fill Knuckles with his spawn and to take care of them slowly consuming all his thoughts.

Shadow draped himself over Knuckles' back, turning his thrust into grinding as he pulled him up against his chest.

"Shads! Shads, please!", Knuckles whined as he tried to pull Shadow as close as he could to him. Shadow's growling sounded like an engine, loud and powerful, while Knuckles' whines and moans sounded more high pitch and desperate.

"Please! Oh please, yes! Right there!", Knuckles cried out. His body tightened under and around Shadow, trembling as his orgasm rushed through him.

The clench brought Shadow to his peak, sinking his canines into Knuckles' shoulder, he gripped him into a tight hug as he let the first egg slide into his awaiting womb. Knuckles choked out a gasp as he felt the warm orb stretch and slide into him, then another thrust from Shadow left another egg inside, then another and then the last one slid in followed by a wave of warm liquid.

Deep within the red echidna's body, the four alien eggs slowly moved to different sides of his womb and began implanting themselves within the uterine wall.

Knuckles could only gasp for air as he felt the warmth consume him from the inside out. He was trembling under Shadow, his body only being held up by Shadow's incredible strength, he could feel Shadow slowly release him from his hold and pull out.

Knuckles instantly clenched as he felt Shadow's fluids starting to leak from his slit, he could also feel the eggs' weight within him as he was laid on his side by Shadow.

"Knuckles? How do you feel? Are you alright?", he asked. Looking up, Knuckles could see that his lover had returned to his more Mobian looking form, worry and concern written across his face. He smiled playfully up at him as he nodded.

"Yeah...they're...they're a lot heavier than I was expecting. I feel more stuffed than a Thanksgiving turkey", he muttered. The relief on Shadow's face was instantly noticed and he too smirked down at Knuckles.

"Are they now? I've never noticed", he chuckled. Shadow then brought the blanket over the two of them as he moved to cuddle with Knuckles.

Knuckles nodded as he slid himself against Shadow, head resting on his white furred chest where he could hear both of Shadow's heartbeat.

"Do we need to do anything else now or...?", he mumbled as he had made himself comfortable. The thought of moving didn't appeal to his tired body that much. Shadow nuzzled into his dreadlocks and hummed thoughtfully before giving his answer.

"No. At this point, the eggs will have probably implanted themselves into your uterine wall. Now, all we have to do is let the pregnancy play out. How long will it be? I honestly haven't a clue since this is the first time I've decided to fertilize these eggs.

"What I do know is that I'll take good care of you, and our children. You can guarantee that I will make sure nothing bad happens to any of you, I will guard you with my life!", said Shadow.

His fingers combed through Knuckles' dreadlocks soothingly, encouraging the red echidna to close his eyes and rest. Before he drifted off to sleep, one thought came to his mind.

"You know... we're gonna have to tell our friends about our relationship now. They're gonna start asking questions when my belly starts getting bigger, so they'll need to know", he said.

[To be continued...]

Author's Note: Thus ends the first chapter of my first Knuxadow, Mpreg story. Hope you liked it. This story won't be that long, maybe five or six chapters, but I'll see how I feel. See you all next time!