Cosmo, Millie, and Barby were asked by Knuckles to see him in private. In his bedroom, their jaws dropped at what they were looking. They were staring Knuckles having not one, but two penises. He turned around and showed them his tail was a penis too. It was only temporary as Cosmo was the first to stop being speechless, "Oh my."
Knuckles chuckled, "No kidding. This will be a great way to have a foursome."
Millie asked, "How is this possible?"
"I had Tails help me out with some elixirs. The fox is a total genius."
Barby then sauntered over and put her arms around his neck. She kissed him on the temple and looked him in the eyes as she spoke, "I got dibs on the tail end."
Standing behind the echidna, Barby squatted down on the cock-tail and thrusted her hips. His eyes went wide with surprise as the other unclothed females followed suit. Showing him their bodies still gave them a thrill and he still enjoyed letting them see the goods he had to offer. His eyes roved over Cosmo and Millie's nudity, and vice versa. Taking in their pairs of tits, slim waists, neatly trimmed pubes, and shaved pussy lips. He licked his lips in anticipation while his eyes flicked from their plump breasts to their bright damp triangles, "Holy shit. This'll be hot."
He smiled as he was fully aware of what was going on with Barby around his bum. Huskily, he told Millie and Cosmo, "I believe these are what you want."
Pointing down at his two dicks, the ladies saw them being perpendicular around his crotch as they nodded dumbly. They stroked his fur and kissed his cheeks as they smiled while telling him out of unison, "This is quite a gift. With three no-no parts, this'll definitely be big."
Knuckles took both of Cosmo's hands with his left hand and took Millie's in his right. He looked into both sets of eyes with intense love while speaking with sincerity, "I love you all so much. You three and every other woman in this colony."
Cosmo grinned up at him while she kneeled down to fondle his left member as Millie went to his right one, "A big way to end it all."
"Well, it's almost the end."
"What do you mean by that?"
"I remember some other women telling me they wanted to join this club."
As Cosmo nodded to say that she understood, Millie asked him, "Who exactly are you talking about?"
"Well, I need to grab my phone and check."
"It's ok, you can do that after you cum in all of us."
Looking back, the red echidna noticed Barby laying her head on the back of his neck as he kept bumping his penis-tail into her vulva. She questioned him, "Are you familiar with these... soon-to-be new residents?"
"To some degree. It would be weird if I didn't, don't you think?"
"I don't think, I know it would."
After patting Barby's rear and rubbing her buttocks to make her giggle, Knuckles groaned as she felt Cosmo and Millie caress his special parts. He could imagine the smiles on their faces, then he said in an awed whisper, "You ladies like it? It's unnatural, but it's too damn fun to not do."
With a small laugh, Barby, Cosmo, and Millie and agreed, "If having more than one penis for an indefinite period time is wrong, we don't want to be right."
The chicks could hear his breathing quicken as he wiggled his body a bit. He seemed fascinated with everyone's actions as he asked them all, "Anyone want to use a bit of lube?"
Without speaking, Barby got out a bottle of lube she brought with her and poured some on Knuckles's dick-tail. Now she was really ready for whenever his cock went in and out of her. She then shared some with Cosmo and Millie. Since he now had his members lubricated well, he gritted as he queried the others, "What does it feel like to have part of me inside all of you?"
Barby answered, "Soft. Warm. Tight."
Cosmo moaned, "Like eating a mushroom with the squeezability of a damp sponge."
Millie added, "Familiar. Comfortable in a way... very naughty."
Knuckles grinned as he continued to them all, "Glad you all like it. Foursomes are awesome and positioning these cocks to fuck three females at once is easy... unless you don't have help from a genius."
Barby felt the tip of the dick on his behind push against her back door and she let out a gasp of arousal. Then she had an idea, which was to turn her body until she could see his back and bounce on his dick the same way as before, only now she could kiss the back of his head too. Meanwhile, Cosmo and Millie stood up to slide the heads of his cocks into their pussies while bending over. Those sex organs were stretching the ladies wider than they had expected and such a sensation made them wince a little. He asked as soon as he felt them tense up, "You gals okay?"
Cosmo and Millie assured him, "Yeah. we're good... but go slow at first."
"No problem."
After all, his cocks were big and thick. While Barby's vagina was snuggly stretched around his shaft enough to convince her that she didn't need to complain, Cosmo and Millie need some time adjust as Knuckles work his cocks in a slow rocking motion. Easing more and more of it into them, they were tempted to reach for their clit but held back. Their pleasure resulted in them moaning and blinking in amazement as he fed them inch after inch of his stiff penises, they estimated that all of them must be at least seven, eight, maybe nine inches long. That was a lot for all of them.
As Cosmo and Millie felt Knuckles's hips press against their tushies and gave a gasp. Just a tiny bit of pain and mostly pleasure, Knuckles was gentle and steady as he pulled halfway out and then pushed back in slowly, he was slowing down until the ladies gave him consent to speed up.
Barby, Cosmo, and Millie all moaned, "This feels so good. Ung. Ahh. Unnggg."
That was all forced from their mouth along other short gasps as Knuckles began to thrust a bit harder after being told that he was allowed to do so. It was hard enough to make soft slapping noises when his hips banged against Cosmo and Millie's buttocks. Similar noises were made as his butt humped Barby's. He panted out in pleasure as he worked harder and faster. Also, both sets of balls swung and slapped against Millie and Cosmo's shaved pussy lips, they would stick there for a split second, glued by my sopping wet cunt. The one on Knuckles's tail had no scrotum of testes, so Barby didn't need to worry about anything getting stuck to her.
Knuckles pounded everyone's asses in fast relentless strokes. The room filled with the noise of flesh on flesh, yelps, and breathy swearing. Suddenly, the red echidna grunted out as he slammed all the way inside of Cosmo and Millie and held himself balls deep in their bare bottoms, "Ffffuuuuuucccckkkkk."
The two women in front of Knuckles felt him judder and his cocks twitch inside them as he began to ejaculate. He spurted again and again, filling their vaginal canals with his semen. His unloading seemed to last forever as his body shook and made their butt cheeks tremble. It wasn't long before Barby felt the same with his seed also traveling to his butt to come out of the tail penis.
With a tired sigh of pleasure, Knuckles pulled out of everyone's behinds and used his remaining shred of energy to check his phone and see who was due to visit him, he told them, "Ok, expect Tangle the Lemur, Whisper the Wolf, Perci the Bandicoot, and Staci the Bandicoot to come by."
While Cosmo and Millie had fainted from sleepiness, Barby lied on the bed and laughed, "Boy, tomorrow is going to be a long day, assuming they all come here tomorrow."
Before Knuckles fell asleep too, he watched the tail become normal again as the duplicate penis on his front disappear, leaving the only the original. He yawned as he pondered, "Doing a fivesome should be easy with Tails's gadgets and potions."
