Knuckles had recently caught wind of a Chaos Emerald in the city, sensing its seething power. He soon realized that it was coming from a rather tall building, seemingly an apartment of some kind. It was definitely a wealthier part of town, so Knuckles had presumed it was someone that simply bought the Chaos Emerald somehow. Possibly a collector or something different entirely, the echidna pushed away these thoughts swiftly. The person withholding such a powerful gem didn't matter; the only thing that mattered was retrieving and securing it.
The muscular red echidna pressed onward along the sidewalk to the front of the complex. He pressed the door of the building open with his muscled hand, slowly trotting inward, observing his surroundings keenly. Eventually, he spotted the stairs, walking towards them and ascending upwards once reaching the first step. He was growing closer to the source of the energy, stopping on the second level and finding his way to a door, he was certain this was the location. He balled his muscular gloved hand into a fist and knocked firmly onto the door, not the type to immediately trespass when attempting to get what he wants.
Finally, after a few more knocks, he heard mild shuffling coming from within the home. He stood stalwart awaiting an answer, growing more and more impatient as he knew it was his duty to retrieve this powerful relic at all costs. The door suddenly swung open, Knuckles eyes opening wide, perplexed at the sight before him…a blue hedgehog, adorned in what seemed to be French maid attire with subtle stains. "S-Sonic, what are you doing, why are you here?" Knuckles shouted demandingly, Sonic only lowering his head submissively and stepping to the side, allowing the sensual bat to trot over, swinging her hips from side to side; breasts bouncing delightfully.
"Oh Knuckie, how unexpected of you to arrive at my humble abode," She uttered with near delight in her voice, giggling after her joyous sentence, resulting in her breasts bouncing hypnotically. "Have you come for a drink, or something more darling?" She said whilst resting her feminine gloved hand over his strong red chest. Knuckles remained unenthused by these actions, swiping her hand away as she looked nearly offended by his stone-cold facial expression. "What have you done to Sonic? And more importantly, what have you done with the Chaos Emerald?" He spoke with might and command in his voice, not falling for her feminine wiles whatsoever.
"Oh Knuckie, how disappointing…I was hoping so much that you would have more on your mind than that silly little crystal, tsk tsk," She was blatantly disappointed, always wanting to have a go with the muscular red male, but having her advances denied each time. "And as for Sonic, he's just my little plaything by now, don't worry about him, he surely doesn't." Methodically this response was trickled from Rouge's lips, unconcerned about her blue slave, and more concerned about what actions Knuckles would take to get the crystal from her.
The red hunk could sense the crystal radiating energy from within her apartment, and he simply shoved Rouge to the side, having no care for her pointless dribble. He wanted to help Sonic, but the Chaos Emerald had to come first. Rouge attempted to protest, but hadn't enough time before Knuckles had already entered her bedroom, nearly smashing open her closet to reveal a thick metal safe, he knew where the crystal was located.
He balled up his muscular hand once again but prepared to strike. It only took him a few moments to bust through the weak-in-comparison metal box, seeing the Chaos Emerald inside, and taking it into his grasp quickly. The echidna trotted his way out of the bat's room triumphant in his quest to find one of the remaining Chaos Emeralds not in his possession. It was now time to aid his friend, Sonic the Hedgehog.
"You know it's rude to go through someone's personal items without asking, knucklehead!" The beautiful bat boasted, immediately attempting to kick the echidna to the ground with her strong leg, the heel of her boot nearly reaching Knuckles before he simply put out his hand, grabbing her leg and tossing her to the other side of the room, bloodying her face and bruising her body. "Sonic, we have to get out of here!" Once again, the response of the blue hedgehog was nothing, he was simply another one of Rouge's sapphire gems.
Knuckles knew Sonic was too broken to do anything without being forced, so Knuckles had decided he had to finish off Rouge somehow…he had to get revenge for his friend. He stomped with purpose towards the now completely vulnerable bat, she tried her best to stand, but was pushed down under the sheer force and muscle of the echidna. He gripped onto her clothing firmly, with one strong yank, it was all but gone. The bat was now truly vulnerable to the echidna's whim.
Though Rouge protested slightly, she wanted this and knew deep down her lust hungered for him greatly. His muscular red form overpowering her juicy plump rear; just imagining being slapped by him made her throbbing walls ache with desire. But Knuckles wanted nothing to do with the bat, he simply wanted to punish her for the atrocities she committed against Sonic, he had already decided he wouldn't use his thick crimson cock to ravage this needy slut. Her rounded rear now being revealed to Knuckles, he spat on his fist to lubricate it just enough to fit before lowering it to her now puckering hole.
Rouge spoke up in horror at the sight of Knuckles preparing his fist behind her, sweating in fear as she whimpered out "Kn-Knuckles, you can't do this! That won't fit, I'll be killed!" but her protests meant nothing to the muscular echidna. He punched his fist into her dark star, the large spiked glove splitting open her pained tailhole. He retracted it out after his fist was fully engulfed by her hole, only to ram it back in once again, repeating this process until her puckering gape was nearly as big as her own head.
Sonic watched nearly expressionless, still standing patiently by the door, awaiting new orders from his mistress. As he watched Knuckles fisting her, though… he began sweating through his fur as he felt something rising beneath his black and white skirt; nearly lifting it as his blue boner began launching upward. His cock couldn't help but dribble pre at the sight, it falling from beneath his dress onto the ground, desiring to be used by Knuckles and abused by Knuckles.
At this point, Rouge was knocked unconscious from the sheer agony racked throughout her body. Knuckles saw no point in continuing this action if Rouge wasn't even awake to suffer it. So he retracted his fist, and stood up from the still breathing unconscious bat and began marching towards Sonic, taking him by the hand and walking from the apartment building, out of it and escorting him away from the complex.