Knuckles left the colony to ask Tails to make him potion that could actually transform his normal voice into his movie voice. Temporarily, that is.
When Knuckles drank the potion, the effects immediately kicked in, and he talked like he did on the big screen.
Back in the colony, he showed off his voice with the words, "Knock, knock."
Mina was the first to be allured by that voice and hugged him, "Wow, Knuckles. You sound sexy."
"Thank you for that comment."
"Did Tails help you with that?"
"Yep. After all, the fox can build a TV out of paperclips and reprogram a supercomputer using dishwashing detergent and a toothpick. What is there that Tails can't do?"
Getting her phone, Mina asked Knuckles to keeping talking with his movie voice so she could record him as she pulled out her phone and pressed the record button on it, "We haven't seen any sign of another person since I departed from this colony to get a voice-altering elixir from Mr. Prower. Now, since no one here has any dresses, skirts, shirts, shoes, socks, or even any undergarments on, every female here is free to expose their delicious tits. Furthermore, since this place is secret, chances of someone else breaking into this place are miniscule. No one will hear us or even be coming for us; they also will not be able to see or hear anything."
After the echidna stopped speaking, Mina stepped back and looked at him, standing while shivering from the sexiness of his new voice as he went on, "Since this is a nudist colony, I am delighted to be surrounded by something affiliated with nature. Naked women have beautiful round tits on display with their hard nipples being encouraged to blossom to full harness by the air around them without a bra to hide them."
The way Knuckles spoke was somewhat quiet, but loud enough for Mina to hear. She blushed and responded, "I don't think you would be as nonchalant if it was you who was exposed."
"I am exposed. I usually wear only my spiked gloves and shoes until I visited this place."
She just laughed. After all, every woman in the club had no intention of trying to cover themselves. Knuckles then reached for Mina's while observing the erect state of his own cock, asking, "If you don't mind, I'd like to take some au naturel pictures of you."
Mina giggled and said, "I do not mind at all. Take as many as you wish."
Knuckles then proceeded to blatantly take pictures of Mina's nudity from multiple angles. Some of her front, some of her back, and some of her left and right sides. He really imagined himself as an erotic photographer. She smiled, "You are such a good picture taker."
"I know, and I know you love me all the more for it."
After some closeup pics of Mina's genitals, the red echidna stepped close to her. As soon as she was close enough for him to reach out and touch, he gently caressed one of her boobs in one hand. Knuckles could never get enough of playing with her tits... or anyone else's.
Putting his hands on her shoulders, Knuckles had Mina kneel down until he was able to have his erection pointing right at her face. With his hand now at the back of her head, he directed her face closer to his penis a bit. Mina knew what to do because she opened her mouth and Knuckles let out a sigh as he felt the soft wetness of her mouth encapsulate him. He slowly guided her mouth up and down his cock while enjoying the sensations. Then he stopped well before he really wanted to and let go of her, saying, "My, my, I just want to take a moment to say that your mouth is skilled in the art of blowjobs."
She wiped a bit of drool from her chin and asked, "I expect you to want to keep going?"
"Hopefully, you want to keep going as much as I do."
"Luckily for you, I would love to resume what we are doing."
"Excellent. Before we do, I would like to do one thing really quickly."
"What is that?"
Grabbing a nearby chair, Knuckles sat down since he knew it would be more relaxing. He exhaled, "This is comfy. Whenever you're ready to keep going, Mina."
Knuckles gave a light slap on Mina's round ass to prompt her to continue. A quick finger check revealed that her pussy was soaking wet, and she mostly was wet long before Knuckles returned the colony to showcase his movie voice. Quickly, Mina turned around and lowered her pussy to let his member go in. She moaned when his cock slid fully into her. Both of them loved the feeling of him being inside of her. Her tight warmth enveloped him as he pressed all the way inside of her and began slowly fucking her, thrusting in and out of her with long strokes. Mina moaned, "You have turned me into such a slut."
The echidna said back, "I am pretty sure that you made yourself a slut."
"I would have never done something like this with another man because I doubt there are good men like you."
Picking up speed, he said, "I'm sure Sonic and Tails are good men."
"Tails, definitely. Sonic, I'm not so sure."
"Let us agree to disagree. Dot dot dot dot dot."
That last sentence from him made Mina laugh hysterically. As her orgasm started to build, Knuckles slammed into her with full force, the sound of his thighs slapping against her ass mixing with little noises coming out of her mouth each time he bottomed out inside of her, filled the room. No other lady heard because apparently, they were all busy with other stuff.
Suddenly, Mina gasped and moaned as her orgasm hit. Knuckles felt her grind against him and clamp down. It was enough to push him over the edge as well. He grunted in pleasure as he pumped her pussy full of cum. They stayed still for a minute, enjoying the feelings, and catching their breaths. Eventually, they separated with Mina collapsing on the floor.
With Mina still not able to move, Knuckles took the opportunity to take more pictures. He captured the way her tits were pressed against the floor as she lied down with her butt pointing upwards. The way her pussy glistened in the sunlight made him want to take another pic before she stood up as he said, "Man, these pics-"
Knuckles stopped before he noticed that something was off. His voice seemed to have reverted back to normal, "Huh, guess the potion wore off."
Mina giggled, "Well, it was fun while it lasted. You can always ask Tails to make another one."
