A black hedgehog began to wake up, his eyes greeted by the blinding light seeping itself through the half open blinds. Shadow grumbled, hearing the sound of his alarm was something he never looked forward to. He slammed his fist down on it causing it to stop ringing and heard a soft sound realising he was not alone in bed. 
His red eyes slowly diverted to the left of him to see a reptile curled in a ball with his back to Shadow, scratches covering the majority of his neck and shoulders. But the back of his head was untouched, it looked polished and brand new compared to the rest of his battered body. Though, most of his body was hiding under the covers, and he could only see as low as his bust, and gulped slightly.
"Ah, you stayed the night." monochromatically spoke the hedgehog, watching the chameleon sit up slowly and arc his back as the pain travelled through his body. A weak hand was soon placed on Shadow's, causing the hedgehog to look up his arm. Deep cuts going from the top of his shoulder, all the way down to just underneath the nail of his index finger. His hand was moved when he noticed Shadow's pupil's had shrank and he placed a hand on his own head. 
"It's okay Shadow." Espio weakly said, trying to get himself out of the bed. "It doesn't hurt as much as you, a-ah…would expect it to." His feet slowly touched the carpet and he stood up, legs wobbling as they battled to keep balance. 
The hedgehog watched the reptile make his way to Shadow's closet and use his tail to pick up one of Shadow's shirts. He didn't damage his tail either, just a bruise could be seen from where Shadow had yanked it too hard and dragged him all the way up his stairs to his bedroom. 
"No, no it's not. I went too far this time." The hedgehog bitterly said, rolling out of bed and falling on the floor. He then stood himself up, feeling a small sting at his ankle from where Espio had began biting him to stop tears from coming as Shadow dug the blade into his friend. "I'm sorry." He then limped over to Espio and began putting the shirt he picked up on the chameleon, knowing how much damage he'd done and how much he abused the shit out of him. "I shouldn't have taken advantage of your trust. I almost killed you." He slid the shirt through one arm, and then the other, beginning to button it up. He noticed the chameleon didn't turn away from Shadow, but stare right into his ruby eyes as he helped the chameleon. "Are you sure you want to go into work today?" 
Shadow could just make out a small nod, it looked more like a twitch in his neck though. "I…" he winced as one of his legs were lifted slightly and trousers slowly beginning to be placed over his red stained white boxers. "Please don't apologise. I realised you felt bad once you…" Shadow was glad Espio could speak, at the least, showing he could breath properly now. Espio didn't finish his sentence, but he didn't need to, Shadow knew exactly what he meant. "Just cover for me at work?" He nodded slightly, it was the least he could do. 
Once Espio was dressed, Shadow decided it was only appropriate to give him a lift to the agency. The car was awfully silent though, and Shadow noticed Espio was looking at one of the deeper cuts around his wrist, but Shadow only did this to the back of his hand so he didn't do any damage to Espio's veins, knowing he could've died. He continued to drive though, the 30 minuets distance from his house to Espio's by car gave him enough time to think back on their relationship. 

It hadn't been long, just over a week, since this messed up situation began. Starting as a bit of fun, Shadow used Espio as what was known as a punching bag one night after drinking one too many at a party and stumbling across the chameleon alone in a room. The next day Shadow apologised to him and Espio said it was okay, and admitted it helped him to forget problems. They began getting closer in terms of friendship, and after having the last chaos emerald he had stolen by Rouge, he got angry and began smashing up the agency when only him and Espio where around. The chameleon panicked, being threatened by the boss about damages from previous incidents and told Shadow to lash it out on the chameleon instead, and Shadow did. No matter what the pain was Espio kept to the deal and stuck it out. 
Shadow had used a knife before, but only to scratch against the chameleon when he's screams got too loud. Nowadays he used any excuse to abuse the chameleon, but Espio never questioned him or complained. Heck, at times he caught Espio smiling and breathing through his teeth as if he was enjoying the pain. And it would be wrong to say Shadow wasn't enjoying it either. They were both finding it…Kinky to some extent.
That was, until, last night. Espio and Shadow went to his house and watched a horror film. A gore scene approached and neither of them seemed to scared about it, but sat close to each other anyway and it seemed intimate vibes were being passed onto one another while watching film. Even though all it began with was the slight lean on one another bodies, it ended up with Shadow's hand on Espio's inner thigh as they continued to watch one of the figures touch the other one with the knife, shredding off all his clothes in the process except from his boxers and scratching into him. He then turned off the television and slowly looked at the chameleon, squeezing his thigh slightly. 
"That wasn't scary was it?"
"Not really, it's basically what you do to me half the time." Awkward silence. "I don't mind it though."
Something escaped Shadow's mouth after an internal conflict he was having with his mind. "Do you…Want to go a step further?"
"I…What do you mean?"
"I've had this desire for a while Espio, but it is fine if you don't want to."
"Well what is it?"
The hedgehog let out a small sigh before turning to Espio. "I want to go deeper with the knife, I want to feel it inside your skin…you probably find me weird and psychotic. But I don't feel it for anyone and don't think I'd be able to do it to anyone else out of pleasure like I do with you. I find the moans of pleasures and gasps you do quiet…Appealing"
Espio didn't look disgusted or anything, but curious. "Does my body satisfy you then? Is it a slightly sexual reference you are talking about? Is blood a lust to you?"
"…I don't know, does it appeal to you?" He noticed the chameleon turn slightly red. "It's just a fetish, you know I of all people don't mind." He brought his face closer to Espios. "So what do you do say?"
He didn't answer, but Shadow could tell from the look in his eye he wasn't too bothered either. A loud gasp and moan suddenly escaped his mouth once the hedgehog threw him to the ground and dragged him up by yanking his tail and pulling him up the stairs. It was the first time Shadow did anything with his tail, and he groaned at the pain, but got sidetracked at the new pain at his chin, which banged itself against each stepped. He felt it on the edge of splitting, but fortunately it stayed in one piece. The chameleon was then dragged to his bed where he would satisfy Shadow, and lied himself down immediately wincing knowing he may soon get pain.
It began slowly like usual, Shadow punching against Espio's stomach and biting him hard, this time he shook his head as he bit though, and let the blood seep out from the wounds. His tail had began wagging violently from the first sight of Espio's blood actually drip from from his neck and his lips trembled, dreaming to be able to lick off that blood. But he realised he shouldn't and continued biting, his ears looking out for the cries of bliss and moans from the sound of his partner. Once these sounds rang through his ears and blocked out everything else, he grabbed for the knife on the side of his bed and sliced the shirt in half. Espio began blushing as Shadow peeled the shirt away from his chest, being careful not to cut on his body, the blood still dripping down from his neck. He heard his warm blooded partner coo to himself before pushing the knife into his belly, just above his small belly button and working his way upwards. 
The chameleon gasped, feeling his body being cut open, and his legs began to shake. Despite this, he opened his legs out and let Shadow crawl in between them, continue his light carves and scratched around the huge line, as if trying to make a work of art. He continued working on the upper body for a whole 20 minuets, pressing his lips lightly against the unharmed parts of his chest as he threw his knife into the reptiles body, feeling the chameleon jump against him whenever he went somewhere new aroused him even more then he already was by the crimson lake. 
He finished off by slashing his knife into Espio's hips and then bring his face close to the chameleons. "Espio…This is so hot you know…" 
The chameleon put a hand slowly to his own chest, then bring his hand close to Shadow's mouth and let him lick the blood off of it. "It doesn't hurt too much, at the beginning it does especially, but like sex it gets…Better." Espio wasn't entirely sure whether he was getting pleasure from this, but seeing Shadow in such a way satisfied him. 
The hedgehog chuckled and began licking Espio's finger as he continued to attack Espio in such an inhumane manner. He ripped off his trousers and went lower with the knife, exploring his inner thighs which Shadow admitted were definitely on his 'hot spots.' He didn't plan on going towards Espio's sexual parts, mainly because if he hurt them then he couldn't make intercourse with the bloody reptile. And the hedgehog was very, very horny.
He wouldn't stop though, his mind had gone numb as he dug the knife deeper into Espio and sucked the new blood splurging out of his flesh. His body felt more erect at the feel, and stab deeper and deeper into him. Espio's voice was now drowned up, the only thing on his mind was lust, he needed more. 
The chameleon put the covers over his face to stop him from crying. It was the fear of death that was now ringing in his mind, and he knew he had to fight back somehow. Yet he was scared, Shadow had so much power over him one misunderstand could lead to him being stabbed right through the stomach on purpose. He hoped Shadow would stop, but the pain just kept on going for what seemed like hours, and he could barely keep up with consciousness and he decided to do it. He cried.
Wailing became known to the hedgehog and he looked up to see Espio's eyes drowning in water, teardrops falling down to mix themselves with his own blood. His face was pale, frightened and shaky. He couldn't move, all he was able to do was shake with fear and tremble. But once Espio did this, it made Shadow realise what he was doing to the chameleon.
He felt sickened by himself.
Shadow's first reaction was dropping the knife, but he picked it up soon after and threw it out the room, making sure it was out of sight. He then crawled over to Espio and sat upright, placing Espio's head slowly on his lap and stroking it. The chameleon continued to sob, and gazed into Shadow's eyes for comfort, which Shadow gave. He put his hand wearily on Espio's cheek and bit his own lip. 
"I'm a fucking monster." He lowered his head, and by doing this he also took it close to Espio's. "I…I'm so…so sorry." And with that, Shadow kissed his lip slightly, making sure Espio was comfortable and sitting in a safe position as they began to make out. Espio's scenario didn't help but he made the best of efforts to kiss him lightly on the lips as they continued, Shadow's bare hand upon his back to keep him upright. He slid his tongue into Espio's mouth, and Espio began to taste his own blood, it caused him to go slightly drowsy and close his eyes, and the next thing he knew he was finding it hard to breath and blacked out from reality…

Shadow shivered, he didn't enjoy thinking about that. It put him off ever wanting to fight again, let alone continue their blood-kink relationship. Yet, he did want a relationship with Espio. As he stopped the car, he couldn't help but think about the way Espio shyly kissed him, the way he touched Espio's body and the way they pressed against each other in the heat of the moment. He shook his head, knowing after what he did it was unlikely Espio would even visit his house again. 
"Wells heres your stop." He said with slight dissapointment. "I'm going to sign in later, I think I'll go on a drive." 
"Oh, uhum, okay." Espio smiled at him and closed his eyes tightly. "Thanks for the lift." Shadow felt his cheeks flush with the thing he so longed for last night as Espio pressed his lips against Shadow's cheek and then struggled to leave the car and limp to the agency. Shadow knew he could it, he didn't once doubt the guy, even after Espio had his breakdown.