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It was an accident... or at least it started as one.

Knuckles the Echidna didn't know how to feel when he returned from his morning workout session and found none of the residents of his home lounging about. Amy and Sticks liked to take walks this time of morning, but usually around the time he got home Tails and Sonic were sitting on the couch watching television or playing video games of some kind. To find nobody in the large living room was slightly strange, but didn't cause for concern just yet.

"Guys?" Knuckles called out, halfway to the bathroom to find a towel so he could wipe the sweat from his body. Even with the ceiling fan he still felt overheated. He went to the nearest closet and promptly buried his face in one of the towels, groaning as he rubbed it down his face. Right now he equally desired a nap and some proper food.

Knuckles was just thinking of how he could probably rest a bit with everybody out of the house when he heard a noise. The noise startled him because up until now things had been dead quiet. He jumped, dropping the towel at his feet. It sounded like a cry, or a shout, or something in between that Knuckles couldn't make out through the walls. He went back into the living room, but still nobody was here. He heard it again. It was definitely somebody shouting.

"Please!" Knuckles could just barely make out. Somebody was begging.

"Tails?" Knuckles asked. He recognized the voice even if it was distant. He followed it all the way outside when he heard it again. It was coming from Sonic's shack. As he approached he saw all of the window blinds were shut, and the door that usually hung open was shut. Knuckles was just about to hop up the steps, but nearly tripped over something he kicked his feet into.

"A-Ah!" Knuckles gasped, steadying himself quickly. Right in front of the door were both Sonic and Tails' shoes. Their socks were tucked out of the end as though they had been removed hastily, but why they were outside and not inside Knuckles had no idea.

"S-Stop it!" Knuckles heard Tails shout again.

Knuckles approached the door, and found it to be locked. He thought about shouting, but remembered something Sonic said to him once about making his presence known in danger was a bad decision. He instead decided to assess the situation before barging in, even if Tails pleading sent a chill up his spine. He crouched and went to the closest window, peering into the crack.

The sight was... Knuckles had no clue how he felt about the sight.

Knuckles saw Sonic and Tails both laying on the floor. Both of them were barefoot, although only one of them was bound up in a hogtied position. Tails writhed in his bindings, wiggling his toes and feet pathetically. Sonic was on his back with his head near Tails bare feet. His legs were up and he looked relaxed despite Tails clear struggling.

"What's wrong?" Knuckles heard Sonic ask. He outstretched his fingers, and stroked one down Tails' bare sole. "Why are you begging? You know that won't make me stop."

"S-Sohohonic!" Tails whined. "K-Knock it off!"

"Oh, I know how to make you like it," Sonic said in a teasing almost sort of purring way. He grabbed Tails' ankle and moved his mouth to his toes, slipping his lips over them. Tails instantly gasped.

"N-No!" Tails shouted. "P-Please no more licking! I-It tickles!"

"Caah heee hooo!" Sonic said through a mouthful of fox foot residing on his tongue. He licked slowly, delicately, precisely. Tails screamed as though he were truly being tortured. Knuckles stared at his feet and how they writhed and listened to his laughter. He couldn't look away. Knuckles was actually frozen in place staring as his friend tortured his other friend. Tails seemed to be in agony, but Knuckles couldn't look away or command his body to move.

"I know what you need," Sonic said tauntingly. He picked something up from the floor. It looked to be a long metal stick with a flap of leather at the end. "It's your old friend, Tails."

"N-Not that," Tails whined as Sonic stroked the riding crop up Tails' heel to his toes. He tapped three times, each more rough than the last. He lifted his wrist, and swatted down. Tails cried out.

"A-Ahh!" Tails whined, his feet scrunching.

"Beg and I'll stop," Sonic said in a sing song voice, slapping again.

"P-Please!" Tails cried out.

Knuckles could take this no more. Tails seemed to be in pure

Knuckles puffed out his chest and stood up, taking in a deep breath.

"HEY!" Knuckles shouted, right before barging in through the closed door.

"A-Ah, what the heck?" Sonic shouted, jumping to his feet but then instantly stumbling backward in startlement.

"I-I don't know what's going on here but knock it off!" Knuckles shouted, holding up his fists. "L-Leave Tails alone, you hear?"

"W-What the heck's going on?" Tails asked, sitting up onto his knees. Instantly, Knuckles eyes widened as Tails' wrists slipped out from the bindings near his feet. He ripped off his blindfold, and stared at Knuckles. As their eyes met, Tails' white cheeks turned pink. "K-Knuckles?"

Knuckles blinked, and looked to Sonic. His eyes went down in between Sonic's legs. His cock was fully visible and fully erect, as was Tails' own. Knuckles tensed. His mind was working to process all of this. Sonic and Tails aroused. Tails able to slip out of his bindings. The teasing. The way Tails didn't actually sound upset.

It suddenly dawned on Knuckles that perhaps Tails wasn't in any danger at all.

"Get out!" Sonic shouted.

...................................................................................................

"It's not a big deal," Sonic groaned as he sat back on the couch. Though it was clear the blue hedgehog was flustered, it was nothing in comparison to the way Tails was acting. Tails had been the one in the most compromising position, and not once since removing his blindfold did he look Knuckles in the eye. He stared mostly to the floor, and his cheeks never quite went back to a normal shade. The only time he looked up was to look to Sonic, and Sonic looked back at him.

"I... I just..." Knuckles trailed off. His mind felt hazy and unable to put it into words. "So, Tails wasn't in danger?"

"Dude!" Sonic snapped, sitting up and glaring to Knuckles. "How many times do I gotta say no?"

"I-I don't know!" Knuckles said. "W-What else were you doing, then?"

"Do I seriously have to spell it out?" Sonic responded.

"I. CAN'T. READ!" Knuckles shouted back.

"Should we just tell him, Sonic?" Tails questioned, interrupting the brewing fight that had just barely not bursted up between the two friends. Knuckles didn't even remember standing up, but now he set down with a huff. Sonic did the same and shook his head, planting his palm against his face.

"Fine," Sonic grumbled as he crossed his arms. "Be ready to explain it five times, though."

Tails frowned at this, and looked to Knuckles. When Knuckles looked into his eyes his pupils darted away and his gloved hands went to his knees to squeeze.

"Me and Sonic have been... dating for a while," Tails admitted sheepishly. "When you guys all go out in the morning we mess around at his place. I-It wasn't meant to be a secret this long or anything, just till I got comfortable."

He said it fast as though it were something he had been keeping inside of him for a while now, and it was quick to burst out.

"So, like," Knuckles said, lifting his hands and pressing his fingers together. "Do you two like... kiss?"

"Of course we kiss!" Sonic snapped.

Tails sighed and too face palmed. He shook his head.

"What were... what were you two doing?" Knuckles asked.

He didn't want to say it, but Knuckles hadn't been able to stop thinking about the sight he witnessed. Tails helpless. Sonic taunting him. The sight of the fox's feet, and Sonic's too, bare and helpless. Whatever they were doing wasn't the kind of things Knuckles thought of when he thought of sex at all. This was... different.

Both Sonic and Tails exchanged a look, and then looked away. Somehow this question seemed to embarrass the two of them at once.

"Does it matter?" Tails asked, his voice small. "It's just a... t-thing we like."

"Dude," Sonic said. "Don't tell him that."

"What else do I tell him?" Tails bickered back. "He's asking!"

"I don't know!" Sonic admitted.

There were sparks of frustration between them now.

"Um, dudes," Knuckles said, lifting his hands. "Don't fight, okay? I just... I just wanted to know."

Sonic groaned and covered his face with his hands. Tails bit his lip and squirmed slightly in his seat. Knuckles looked from one of them to the other and felt a tension grow in his chest he wasn't expecting.

"It... It looked kinda fun," Knuckles said.

This single sentence changed everything. The tension in the air didn't vanish, but changed entirely as it was now directed at Knuckles. He hadn't meant for it to come out like that. So bluntly. So... weirdly. What he meant to say was that he had no idea why he couldn't stop thinking of the way Tails writhed and begged and pleaded and how his feet looked.

"Seriously?" Sonic asked.

"I... is that weird?" Knuckles questioned. "D-Dude, you were licking his feet! That's weird!"

"What are you getting all defensive about?" Sonic snapped. "You don't brush your teeth every day don't judge me for where I put my mouth!"

"I forget!" Knuckles snapped back.

"It's just something we like," Tails said, crossing his arms. Once again he popped the bubble of anger between the hedgehog and echidna. "It's kind of personal, Knuckles. Do you really have to tease us about it?"

"I wasn't teasing!" Knuckles snapped in defense of himself. "I just..."

"Just what?" Tails asked. Sonic didn't say anything, but from the look on his face Knuckles could tell he was asking the same thing. Sonic looked to be daring him to make another nasty comment, in fact.

"Does it..." Knuckles began, pausing because he couldn't think of how to finish the sentence he started. "Does it feel good?"

"Uh..." Both Tails and Sonic made the same noise in response.

"When Sonic y'know... licks your... y'know," Knuckles shrugged. Despite his massive buff arms and height on the two he felt small right now. He crossed his arms. "Just wondering."

Sonic sighed, and looked to Tails. Suddenly, the blue hedgehog leaned over and cupped a hand over Tails' ear. The fox's eyes widened.

"What?" Tails snapped.

Sonic whispered something else, and for a moment the two made eye contact before looking to Knuckles. Sonic sat up, and cleared his throat with a cough.

"Look," Sonic said. "How about this. If you aren't being a jerk and just making fun of us we can show you. If you seriously think you're into it, I mean."

"W-Wait," Knuckles said, his chest tightening. "What do you mean show me?"

"As long as you don't tell Sticks and Amy," Sonic said, pointing his finger.

"What do you mean show me?" Knuckles repeated.

"He means..." Tails began, looking sheepish once more. "Y'know... doing what you saw us do."

Knuckles paused. His heartbeat was getting faster and faster. He wasn't sure why but right now he had the desire to close his legs. He buried his hands over his crotch and did just that. The idea of that, all of that, being done to him was suddenly too much. He had just been asking what it was like, not expecting an offer to join in of all things.

"You'd... do that?" Knuckles asked.

"Why not?" Sonic said with a shrug. "Be nice to get you back for busting in when me and Tails were having private time."

Knuckles swallowed, not realizing there was a lump in his throat. Everything in his mind was telling him to drop it, to move on and just respect the two's secret he had discovered by accident. This was none of his business, and the idea of getting in on all of it was...

He thought of Tails' feet again. Writhing. Being licked. Being tormented.

"W-When?" Knuckles asked. "Can we do it, I mean?"