Chapter Text
It started as an experiment, and knowing Sonic, he's always willing to help his rival-turned-friend, whom he may or may not have a slight crush on.
They may have become so-called "friends," but their relationship hadn't changed much. Sonic had become even more annoying than usual—as Shadow would describe it. He had become bold. It started with subtle touches and flirty comments. However, Sonic was known to be affectionate, so Shadow didn't find it that strange. Shadow couldn't help but think Sonic had an ulterior motive, though, and it gave him an idea of how to find out.
By now, the two hedgehogs had a daily routine, so it wasn't difficult for Shadow to plan as they always met at a particular time. "Hey, Shads! Ready for our race of the day?" As expected, Sonic arrived at their regular meeting spot, later than usual. "About time you showed up, hedgehog," Shadow said as he crossed his arms and looked unimpressed by Sonic's presence.
"Aww, were you lonely without me, Shadow?" Sonic leaned in closer as he teased. "Hardly, though your tardiness gave me time to think." Sonic raised an eyebrow. "Oh? About what exactly?" Shadow smirked in his direction as he proposed a challenge he knew Sonic couldn't resist.
"If I win, you'll have to take part in a little experiment I've been working on," Sonic, already intrigued, asked. "And if I win? What do I get?"
"If you win, I'll do whatever you want." Sonic didn't need to hear anything else; he took his place beside Shadow, feeling motivated by the thrilling challenge. "You don't get to back out once you lose, Shadow." Sonic licked his lips as he glanced at Shadow beside him. "I can say the same for you, faker."
After their playful banter, they both took off, running at full speed and breaking the sound barrier in the process. Approaching the finish line, they both came to a stop, panting, trying to catch their breath.
"I win! Time for you to become my slave for the day, Shadow." Sonic put an arm around Shadow's shoulder as he teased about what he wanted out of the dare. Pushing Sonic slightly out of the way, Shadow smirked in his direction as he continued, "Not so fast, hedgehog. I had the fox make something for me to ensure accurate results." Sonic looked confused as Shadow began to explain. Sonic placed his hands on his hips and looked at Shadow with disinterest. "Dude, just explain it to me like a normal person."
"Take a look for yourself, then," Shadow said as he pulled out a small monitor. The monitor showed precise details about their velocity and aerodynamics as well as traced their vitals. Still, its primary purpose was to keep track of their time—that's what Shadow had in mind, at least, but we all know Tails always has to go all out whenever he makes a new gadget. Besides, this could be important information that they might find useful later.
Upon closely examining the numbers, Sonic noticed that Shadow had actually come in first place by a millisecond. As he stared blankly towards the ebony hedgehog, Shadow leaned in closer as he put his hand on his shoulder, whispering in his ear, "Don't tell me you're afraid; you said it yourself, 'no backing out'"
"I-I'm not afraid, I can handle anything you throw at me!" Sonic's voice faltered a little as he realized the consequences of his own words. That's right, he wanted to make him his test subject for his little experiment, as Shadow had called it. Sonic never bothered to ask what he had meant by it and was beginning to feel a little nervous at what he had in mind; it couldn't be that bad, right?
"So what now? You wanna brainwash me for your little experiment, is that it?" Sonic exaggerated, but wasn't actually that far off. "I wouldn't call it brainwashing, but yes, something like that. I've been practicing my hypnosis technique, but it doesn't quite have the same effect on myself as it has on others." As Shadow continued explaining, Sonic grew more anxious as he listened.
"So I've been wanting to try it out on someone else; I figured you wouldn't let yourself open like that unless there were some risks attached, so I proposed a challenge of sorts." That was only half the truth, as Shadow's intention was to figure out Sonic's true feelings and reasons for his recent behavior. "So you expected to win from the start..." Sonic couldn't argue as he knew he had won fair and square, but he didn't have to like it.
"Do your thing then, I won't fight back." Sonic accepted Shadow's proposal with open arms; he knew better than to cower away after already establishing the terms of their agreement. "What do I do?" Sonic asked as he sighed.
"Just look into my eyes and stay still." As Shadow prepared, Sonic took a deep breath as he got lost in his deep crimson eyes. Shadow felt little to no resistance from Sonic—it was almost too easy, Shadow thought. As Sonic fell further into the trance, his knees weakened, and his breath came in shallow huffs.
Sonic eagerly crawled on all fours toward Shadow, feeling unbearably hot. Shadow watched with amusement. He gently lifted Sonic's chin as he whispered in his ear, "Begging for it already?" Shadow licked his lips as he watched Sonic squirm "Please..."
As Sonic pleaded with him, Shadow allowed him to take whatever he wanted. The tension in the air was thickening; Shadow felt his arousal grow more and more as he watched Sonic's desperate tongue freely roam around his hardened pouch. A small gasp came out of Sonic's mouth as Shadow's cock slipped out of his sheath; he wasted no time and started licking and sucking relentlessly, from base to top.
"Fuck, your mouth feels so good..." Hearing Shadow's praise, Sonic's movement became more frantic. He had the urge to touch himself, but he didn't dare without permission. As if Shadow could hear his thoughts, he answered with a low, sultry voice. "Already so wet just by sucking some dick? You're such a slut for me, Sonic. Go on, touch yourself." Getting Shadow's approval, he didn't waste time indulging himself at Shadow's demand. He felt a shiver run through his entire body the moment his fingers made contact with his aching pussy. Wet sounds and panting covering the forrest they ended up in.
Getting more desperate by the second, Sonic couldn't take it anymore. Giving himself a small break to look up at Shadow, he lifted his head and pleaded with him again. "Give it to me, Shadow, cum in my mouth. I need it so badly." Feeling a little out of breath himself, Shadow answered with a thrust, and Sonic whined out in pleasure, "Such a needy little bitch. You'll take what I give you." Though Shadow was acting tough, he could barely hold it together himself. He had been fantasizing about this moment for so long, after all.
"Fuck, this is a fitting look for you. So pretty with my cock stuffed in your mouth." Sonic was reveling in Shadow's praise; he was so far gone into the hypnosis that the only thing he could think about was pleasing the hedgehog before him. As Shadow started thrusting harder, Sonic's slick-covered fingers moved faster as his own climax was approaching.
"Sonic..."
Emerald eyes met deep crimson, a small smile formed on Shadow's face as he saw the state of the hero in front of him. Who knew Sonic The Hedgehog was such a slut for him. The revelation that Sonic had likely never shown this side of him to anyone else awakened a primal instinct within Shadow.
"You're mine, Sonic. And I'll make sure everybody knows," with a final thrust, Shadow reached his limit as he came inside his mouth, it was enough for the hero to succumb to his own orgasm as well. Sonic, determined not to spill anything, did his best to swallow Shadow's thick load. Gasping for air, Sonic collapsed on the ground with contentment.
"Get up, Hedgehog. I'm not done with you yet, I'm gonna breed you until you can't walk."
Sonic simply smiles, and even in his hazy mind somehow manages to utter out his desires, "Fuck.. I can't wait."
"I love you, Shadow... "