Sonic jerked awake, finding himself in a cell, arms bound behind his back and a gag stuffed in his mouth.
He felt very weak, like he had been drugged. He didn't think he'd be able to bust out in his current state. Sonic was wondering where he was and if his friends knew he was kidnapped when a tap on the cell bars got his attention.
Standing outside was Fiona Fox, looking at him with an evil grin.
"Well hello blue boy, comfy?" Fiona sneered.
Unable to talk, Sonic merely growled at his captor.
"Oh don't be like that, I'm not gonna hurt ya." Fiona snickered. Pulling out a key, she unlocked the cell door and let herself in. She looked at him quitely for a minute, still wearing that irritating grin before happily delivering the bad news.
"No, no, I'm not gonna hurt you at all...I'm gonna kill you instead." She told him, clearly enjoying this way too much.
Sonic jumped up as soon as the words were out of her mouth and tried to make a run for it, but in his weakened state, he didn't get very far. Fiona was able to pin him to the ground and get him into a headlock quite easily.

Hoisting him up, she marched him out of the cell and down the hall.
"Now Sonic, don't make this more difficult than it has to be. Just let it happen." Fiona whispered into his ear, keeping a tight grip on him.
Arriving at a door at the end of the hallway, she expertly opened it up while keeping Sonic restrained. Closing the door behind them, she dragged him across the room. What he saw next almost made his legs give out.
Across from them, towering over them both, was a guillotine. The massive blade gleamed in the dim light, as though promising to make quick work of the blue blur.

Sonic fought as Fiona dragged him towards the macabre device, realizing she would make good on her threat. Ultimately it was futile, he simply didn't have the strength to break free from her hold.
She pinned him roughly to the seat as she lifted the lunette, then quickly slid his head under the blade and locked him in. Sweat formed on his head as he stared up at the massive blade promising to take his head clean off. Fiona smiled as she relished the look of fear upon his face. It was however the next sight that made her laugh like a maniac. To much his own surprise, Sonic became highly aroused, his cock now throbbing madly and dripping with pre.
"Seriously?! This gets you off?! Ha! You're the last person I would've expected to be into something like this." She said to him, highly amused.
A slight blush crept onto Sonic's face as he glared at Fiona, the only thing he could do at the moment. He struggled against his binds, trying to get his arms free, but it was no use.
"I'll be right back stud, I'm gonna grab a few things." Fiona told him, leaving the room to fetch her things.
Sonic again pulled against his bindings, once more trying to break free. His cock flopped about as he thrashed his body, succeeding in only making himself more aroused. He had no idea why this turned him on so much, but he knew if he didn't escape soon, that he wouldn't live long enough to find out.
The sound of footsteps told him Fiona was back. In her hands were a bullet vibrator, and a video camera. She set the camera up, pointing it at his genitals before strapping the bullet vibe to his cock and turning it on the max setting.
Sonic let out a long and loud moan, nearly ejaculating right then and there. Fiona turned the camera on and walked up to the guillotine, grabbing the rope, ready to drop the blade. "I've been waiting a long time for this Sonic, and I'm gonna enjoy watching this video of your death over and over again." She cruelly whispered into his ear.
Sonic continued to struggle, his heart racing from both the fear of death and from the pleasure he was experiencing. He bucked his hips, kicked his legs, and tried in vain to escape, but there would be no escaping this time. Finally he gave up, going limp as he closed his eyes and accepted his fate, opting to enjoy one last orgasm. But he would be denied even that.

Sensing that Sonic was just about to come, Fiona pulled the cord, releasing the pin holding the blade in place. The heavy blade fell swiftly, coming all the way down with a loud thud, taking Sonic's head right off his shoulders.
His now headless corpse thrashed about in its final moments. His heavy balls releasing their generous quantity of semen, his body's last attempt to impregnate a female that wasn't there. Sonic's head rolled to the side of the guillotine, allowing him to see his body in his final moments, and he was amazed at how much his body fought without a head. Finally Sonic succumbed to the darkness creeping at the corner of his eyes, and he thought no more.

Fiona watched wide eyed as Sonic's body continued thrashing about, his massive cock spurting semen all over his well toned chest and abdomen.
Giving one last great thrust into the air, and shooting off a final stream of seed, his body finally went limp, his twitching cock the only thing still moving.
She stared in amazement for a few minutes before shutting off the camera.
"Man, that was a hell of a lot hotter than I thought it'd be." Fiona mused to herself.
Picking up the camera, she left Sonic's decapitated body behind, eager to show the video to Scourge. This is gonna be one hell of a birthday present.