Miles "Tails" Prower was casually strolling down the dirt road leading to Sonic's house, carrying a letter he'd received from him in his hand, an immediate indicator that something was off.
Sonic was not the kind of person to write letter, not with his incredibly short patience.
If he needed to talk to someone he'd simply run over to their place, or at the very least make a phone call.
He came to a halt and opened up the letter to read it again, still perplexed by its mere existence.
It read : 
Dear Tails
How ya doin' little buddy, Betcha weren't expecting someone like me to take the time to write eh?
Anyway, if you're not busy, you think you could come over to my place this weekend? There's something incredible I wanna show ya!
I'd tell you what it was, but you wouldn't believe me if I did, I still kinda don't believe it myself!
Hope to see you there!
Your #1 pal,
Sonic
He reread it a few more times, still not entirely believing this really was from Sonic.
It was his handwriting, and it did seem like something he would write, if he had the patience for it.
And still, something about all of this seemed...off. He couldn't shake the sense of foreboding.
With a small sigh, he stuffed the letter back into the envelope and continued onward.
Minutes later he came upon the familiar domicile where Sonic resided.
Coming to the front door, he extended his arm out and knocked on it to announce his arrival.
The door swung open after the first knock with ease, already unlocked.
"Sonic?" Tails called uncertainly, stepping inside and closing the door behind him.
There was no answer.
"Oh, gee, door's wide open and Sonic doesn't answer. Totally a good sign!" He muttered sarcastically.
Tails proceeded to make his was through Sonic's house, calling his name the whole time.
He wasn't in the living room, or his bedroom.
Neither was he in the kitchen or in the bathroom.
Finally, after checking everywhere, he decided to check the only place left that he hadn't looked.
The basement.
Pulling open the basement door, Tails hesistated before calling out.
"Sonic! Are you down there?!"
No response.
Something is wrong he thought to himself.
After taking a breath and working up the nerve, he made his descent into the basement, scared of what he might find.
He only managed to get halfway down before he froze in terror.
In the middle of the basement was a guillotine, covered in blood.
His heart raced as his mind conjured up a horrifying possibility, that his friend was...
He shook his head, once again working up the nerve to press onward.
"G-get a hold of yourself Miles!" He growled to himself. If Sonic was in trouble, or even worse, then he had to know for sure, he wouldn't go for help unless he knew for certain.
Tails made his way to the bottom of the staircase, spotting a door at the other end of the room that wasn't there before.
Quickly he walked over to it, keeping his gaze off the macabre execution device in the room with him.
Coming to the door, he noticed up close it was metallic silver, and it appeared to be an electronic door.
The door slid open with a hiss. This is getting more and more bizarre he thought to himself.
On the other side, the door lead into a hall, the walls lined with a similar metallic sheen, fluorescent lights faintly buzzing in the ceiling overhead.
Tails only managed to take a few steps in when he heard another hiss.
He swung around and saw that the door had closed, and no matter how much he pushed or pulled on it, it would not open.
"No turning back now...I hope you're okay Sonic." Tails told himself.
He continued onward until he reached the end of the hall, cautiously passing through another door leading into another room.
The room bewildered him, it was very large, but all that was in it was a slightly smaller glass room, and inside that room was...
"Sonic!" Tails exclaimed upon seeing his friend. He ran over to the glass room, hands pressed against it as he tried to find a way in.
His relief showed as he smiled upon seeing his friend in one piece, his chest still moving, indicating that he was breathing and therefore alive. Then he noticed the rope around Sonic's neck, leading up to the ceiling, attached to a winch...
That smile left his face quicker than a lightbulb going out. He knew what was gonna happen if Sonic didn't wake up soon.
"SONIC! SONIC! WAKE UP! PLEASE WAKE UP!" he screamed, pounding his hands on the glass so hard it hurt his hands.
His shouts and pounding seemed to work, as Sonic began to stir.
"Nnnggh...Hnnn? Oh, hey Tails..." Sonic said lazily as he let out a yawn.
"SONIC! TAKE THE ROPE OFF! TAKE IT OFF! HURRY!" Tails screamed again.
"I can't hear you little buddy..." Sonic mumbled, stretching his arms over his head.
He managed to look up to the ceiling and see the winch only a few seconds before it activated.
It whirred overhead as it quickly wound up the rope, leaving only enough time for Sonic to look back at Tails, his eyes widening with surprise as the winch hoisted him up to the ceiling.
"G-GUUUUUURK!" Was all Sonic could muster as the ligature tightened around his neck. He started to thrash his legs about as he hanged by his neck.
"SONIC!!! SOOOOOONIIIIIIIIIIIC!!!!!!" Tails screamed in pure terror as he helplessly watched his friend strangle to death.
He looked around, panicking, trying to find something he could use to bust his way into the glass room. But there was nothing, and there was no way out either with the hall door still being shut.
All he could do was watch his friend die.
Sonic continued to kick his legs as his face started to turn red and become drenched in sweat.
As asphyxiation started to take it's toll, his cocked firmed up, throbbing madly and dripping pre.
Tails was both horrified and embarrassed, he didn't want to see Sonic like this!
Sonic continued to struggle in a fight he couldn't win. His feet began to kick less and less as time went on, the veins alongside his arousal now much more prominent, his tongue swelling out causing drool to drip onto his well toned chest.
Then he did something that shocked Tails even more, if such a thing were possible right now.
Using what little strength remained, he reached down with his left hand and wrapped his fingers around his thick, swollen cock, stroking it as hard and as fast as he could.
Sonic's lips moved, but no sound came out.
Tails was stunned, why on earth would he be doing this right now, of all times?!
Tails then noticed that he himself had become aroused, and was deeply ashamed.
He pushed it from his mind, focusing back on the blue hedgehog dying in front of him.
Sonic continued to stroke himself, trying his best to cum before he died.
Opening his mouth in a silent cry of bliss, he ejaculated, his green eyes rolling back into his head as his body shook violently, his cum shooting across the room and hitting the glass wall.
Finally, Sonic's semen covered hand fell to his side, and he stopped moving.
Tails was torn between horror and arousal. He looked up above him and saw Sonic's spunk, his final climax slide down the glass in front of him.
Part of him wished he could taste it, but it was drowned out by thoughts of how he was gonna get out of here and what he would tell Sonic's friends and family.
Those thoughts were interrupted when he saw Sonic's body glow and disappear.
What on earth is going on?! He thought to himself, scared out of his mind.
He turned to leave to try and find a way out of here when he saw someone.
Someone he thought was dead.
Someone he has just watched die.
Standing in front of him, with a friendly grin on his face, was Sonic.
"Hey little buddy! Sorry for scaring you like that, but I told you in that letter you wouldn't believe me if I had just told you." He said apologetically. 
Tails struggled for a few minutes to find his voice. Finally, after taking a few breaths, he spoke his mind.
"H-how are you alive?! What on earth did I just see?! And why did you think I wanted to see something like this?!" Tails asked angrily.
Sonic's ears flattened against his skull and he gave a sheepish grin before answering all of his questions.
"Well, first, I'm alive thanks to the chaos emerald. Ya know, how they can turn thoughts into reality and blah, blah, blah. I just thought of myself being brought back to life after rubbing one out on the end of a noose, simple as that.
As for your second and third question..." Sonic blushed some before continuing. "...A-ahem, I wanted to show you a...kink of mine and how the emerald could satisfy that."
Again, Tails was shocked into silence for a bit.
"...You. Are. CRAZY!" The young fox bluntly told his friend.
Sonic snickered at this. "Pot calling the kettle black much? Don't think I didn't see how hard you got while I was jacking off up there."
Tails' face turned a deep red and he covered himself out of embarrassment, He didn't want to admit it to him, but he did find the sight of Sonic strangling to death while having a throbbing erection very arousing.
Walking up to his little buddy, Sonic licked his lips before gently stroking the young fox's face.
"Be honest with me pal, you got some fucked up erotic fantasy you're just aching to fulfill." He cooed.
Tails studied him for several minutes, before confessing his darkest desires with a single nod of his head. He leaned up to Sonic and whispered in his ear what it was he wanted. The blue blur's eyes widened and an excited grin spread across his face as Tails told him everything. Beaming, he kissed his little pal on the head and told him that they would do it right now.
The two friend retreated back to the room that housed the guillotine Tails' first saw. It no longer bothered him now that he knew everything. That wasn't what they were gonna use though for his twisted fantasy, although it was in the same category.
Sonic bound Tails' arms behind him, then gently laid him face up onto a chopping block. They were gonna use an older method of making the fox's head part ways with the rest of him.
After setting up a camera, Sonic took a huge, broad axe into his hands, giving off a gleam in the dim light.
Tails swallowed hard as he eyed the weapon that his friend would sever his head with. This is what he wanted, to have his head roll and for Sonic to fuck his headless corpse. And it would all be caught on camera.
Both of them were hard as a rock, dripping pre cum from their tips.
Carefully, Sonic lowered the axe onto Tails' neck, the sharp edge drawing a tiny amount of blood, causing Tails to moan as he felt the cold steel tease his jugular.
Raising it over his head, Sonic hesitated, waiting for his little buddy to cum before making his noggin roll.
Tails breathed hard and fast, his cock throbbing and twitching madly as he humped the air, his pecker flopping about as he did.
This went on for a good 20 minutes, the miracle here being that Sonic actually waited. The veins in Tails cock bulged more and more, pre cum was dripping nicely from his member, coating the head in a nice glaze.
Finally, Tails let out a cry as he hit his peak, firing off a nice ribbon of cum several feet into the air.
Sonic was so surprised by how far his little buddy could shoot that he almost forgot what he was supposed to do.
Almost.
He swung the axe hard, burying it into the wooden block and through Tails' neck, making his head roll several feet away, leaving a bloody trail as it did.
Tails moved his mouth and tried to speak, but no words would come out.
Just before everything went black, the last thing he saw was Sonic flipping his body over, ready to have his way with his corpse.
The next thing he knew he awoke in a bed. Sonic was standing over him, holding a memory card, wearing a wide grin on his face. He remembered what happened and was just about to ask about the video when Sonic put a finger to the fox's lips, saying nothing, only grinning and holding up a memory card.
Saying nothing, the two friend sat themselves down in front of a computer that was in the same room.
Tails was excited to see how the video turned out, and wasn't the least bit disappointed.
The camera had captured everything just as he had remembered it. From the moment he was tied up, to the moment he made himself ejaculate without touching himself, to the part where Sonic took his head off, it was all there.
The part he didn't remember though was Sonic having his way with his corpse, flipping him over onto his stomach and spreading his legs. The camera got a good back shot of the action as Sonic teased Tails' entrance. After a bit of teasing, the blue blur finally slipped his cock into his little buddy's ass, his rough thrusts causing his balls to slap against his willing victim's posterior. Tails' eyes grew wider and wider as the video went on. He and Sonic both started to get aroused again as they watched as his still hard cock swung between his legs as Sonic pounded away at his headless corpse, still throbbing and spitting cum despite the fountain of blood pouring from the bloody stump where his head used to be. 
Sonic in the video closed his eyes and gritted his teeth, sweat dripping off of his face as he tried to hold himself back. The constant twitches and spasms  of Tails corpse made this exceedingly difficult.
Finally, Sonic gave him, leaning his head back and letting out a yell as he came hot and hard.
The last minute of the video showed the body vanishing and Sonic turning off the camera.
Both boys sat their in silence after the video ended, once again highly aroused after watching.
Tails then unexpectedly grabbed Sonic into a tight hug and nuzzled his chest.
Laughing, Sonic kissed him on the top of his head. "I take it you enjoyed it then?"
Tails nodded, still grinning. "We're gonna have to find someone else to do this with!"
Sonic smiled and nodded as well in agreement. They definitely need to find another person to do this with now.
Only question is, who?