It was a bright and beautiful day in the city of New Mobotropolis. Feral birds flew through the air, feral bees hummed. Many Mobians walked around the city, saying good morning to those opening their stalls. 
Far from the city though, a small house sat outside the wall. Inside, an eighteen year old fox with two tails was up working on several experiments. His name is Miles “Tails” Prower. Currently, he was researching about pheromones and chaos energy. The fox watched the liquid pheromones bubble in the beakers surrounding him. Nearby, a emerald sat glowing dimly. 
Turning on a nearby recorder, he spoke into the tape.
“Test number six-zero-four-five-nine...previous experiments were a failure. Too little chaos energy extracted or too little pheromones. Have waited six weeks to create a new extractor to extract enough chaos energy and harvested enough pheromones from nearby feral queen bees. Commencing test.”
The fox stopped the recorder and pulled a glass vial with enough of the pheromones. He set it in a chamber, making sure it was nice and secured. After he closed the door, he picked up the Emerald and turn back on the recorder.
“Chaos Emerald is in the extractor...hooking up extractor to chamber.” 
After hooking up the devices, he turned the extractor on. The Emerald glowed brightly, the energy bathing the insides of the device. The instruments showed a massive increase in the pheromones levels. Tails watched the readings, humming.
“Chaos energy seems to make the pheromones of a female Queen to increase in potency.”
The fox didn't know it, but the energy from the emerald was starting to overload the extractor AND the chamber. The wires began to spark, the fox's ears twitching. He looked up just as the sparks caused the machines to explode, the vial sailing out with a large plume of smoke. Unseen by the fox, the vial broke coating Tails in its new substance.
THX
Outside his home, a rabbit with long, shapely legs, a pink leotard that held a massive bust, brown leather jacket and cowboy hat was walking up. Bunnie Rabbot-DeCoolette was her name, though that last part was no longer hers. Earlier in the year, her husband Antoine had passed after sacrificing himself against Ixis Naugus when the wizard tried to take the throne. The resulting attack from the wizard's death had left her with her organic limbs once more.
She walked to the house of her surrogate nephew to make sure he was eating right again, only to hear an explosion and see the large plume of black smoke come out the window..
“Sugah-fox!” The rabbit cried, breaking out into a dead sprint.
She entered the home to see Tails on the ground, rubbing the back of his head. His face covered in soot and coughed out some smoke. She knelt down by him, looking concerned.
“Tails-sugah, what in tarnation happened?”
“Sorry, Bunnie...experiment of mine blew up in my face. Literally.” The fox said with a sheepish grin.
Bunnie smiled sweetly at that, but it soon became a frown. Her nose itched something fierce. She took a deep breath and nearly let out a moan. A sweet, sweet smell wafted through the air and it smelled of spice and oil with a hint of vanilla mixed in. She looked over the fox, her heart beat getting erratic every time she looked over him.
The young fox she used to read stories to had grown up nicely; while not as muscled as Knuckles or Shadow, Tails had a nice amount. All that lifting the Tornado's engine block did wonders in his youth. She licked her lips, trailing her eyes down to the corded muscle, gasping in both surprise and delight.
“T-Tails, hon...”
Tails cocked his head before looking where Bunnie's eyes were. 
“Oh shit!” Tails swore, Bunnie too mesmerized to scold him.
The reason was for the long, large, fat cock that was standing at attention, two large balls resting against the ground. Bunnie had never seen such a large cock, not even from Sonic and he ran around in the nude! Reaching down, she grabbed the cock firmly, but gently enough to not cause him any pain. Tails gasped, staring.
“B-bunnie...we...we can-”
“We can and we are Sugah. I am hotter between my legs then a dry spell in Death Valley.” Bunnie snarled, lust overtaking her.
She tore off her leotard, letting her massive chest bounce free. Tails stared, his eyes wide as one of the nipples presented itself to him. Bunnie grabbed his head and smashed him in, ordering him to take the nipple. 
Tails rapidly complied, sucking hard on the nipple. Bunnie felt the cock stir to life and moaned, rubbing herself against the thick shaft. That just got Tails to moan deeply, Bunnie enjoying the vibrations on her bosom. After several minutes of just foreplay, Bunnie lifted herself up.
Lining up with the tip, she rested against it, Tails watching spellbound. Slowly, she lowered herself, her pussy walls expanding and fighting against the intrusion. She moaned throatily.
“So big...so large...” Bunnie exhaled breathlessly.
Were it not for the amount of juices she had been gushing, the cock would not have slid in so easily. Finally, Tails felt his tip reach something and he stared at the rabbit in shock.
“Bunnie you're-”
“Still am. Now...you're gonna be my first and I'll be yours.”
The rabbit pulled up, Tails gasping at the sucking sensation he was getting. Then she slammed down. He felt his cock tip tear through and saw her entire body go rigid. She panted, holding onto his shoulders for support. He wrapped his own arms around her waist, holding her steady. 
Several tense minutes passed and soon the pain she felt ebbed into pleasure. She gave out a coo, looking down at the fox.
“Go on, sugah...ride this cowgirl.” She breathed out.
Tails obliged her, moving his hips. The action caused his cock to slide back out. Once it reached a certain distance in the kit's mind, he thrust back in. Bunnie gasped at the motion the fox started to set, moving her own hips along with his own. She bit her lips, struggling to suppress the moan that was building up in her throat. It was a fight she quickly lost when Tails began to lick and kiss her sensitive breasts. 
“F-faster, hun!” She whimpered out.
The fox nodded, picking up his pace. The sound of flesh meeting flesh echoed in the silent house, Bunnie's pants and Tails' grunts mixing in. But all too soon Tails could feel himself tightening.
“B-bunnie! I'm...” He panted.
“Hold out, Sugah...just a little...” Bunnie breathed out.
A sudden sensation made her gasp loudly. Looking down, she saw why. A strange red lump was on Tails cock and the rabbit knew right away what it was. His knot. 
Oh, she knew some Mobians had anatomy closer to their feral counterparts, but to actually see one. It mesmerized her. Suddenly, Tails flipped her over, spun her around so that her knees were on the ground and slamming his cock into her over and over. Gasping loudly, she felt her arms pulled back. Looking back over her shoulder, she saw a wide eyed frantic look in the fox's eyes.
She felt something rush over her and shuddered, nearly loosing all control of her limbs. But she was kept up by the fox's ruthless pounding. Realizing that it was his inability to cum due to the knot, she met his thrust with her own, taking the knot in its entirety. 
Her world EXPLODED. No sense of words or feelings could describe the euphoria she was feeling. She didn't even know she was crying out in pleasure and felt Tails filling her to the brim with his seed. All she could focus on was the knot after it had entered her tight pussy. 
After several intense minutes, the two were panting on the floor, Tails still locked in.
“Sugah-tails?”
“Y-Yeah?”
“You and I are DEFEINITLY doin' this again.”