We had been at the hotel with the penis chastity theme before and were familiar with the different colors and sizes of chastity penis cages.  It was very exciting seeing all the other couples at the nudist beach.  I didn't know my wife was going to be holding my key for such a long time and I was locked when we headed to the beach.
  As we stepped off the boardwalk, there was an attractive young female employee stationed there next to a large bin of towels.
"Towel?" The woman asked, stepping in front of is slightly.
"No thanks, we have our own." I replied.
"Actually," the attendant said. "I was referring to your towel, sir. Just a friendly reminder about our mandatory nudity requirement."
I glanced down at the beach towel I had wrapped around my waist. "Oh...right."
I sheepishly removed the towel and threw it over my shoulder. There was nowhere to hide now because my penis was locked in chastity for all to see.
"Enjoy your day!" The woman said as we walked away.
"I forgot about that rule." Anna teased. "I guess because it doesn't apply to me." Anna hung off my arm and playfully patted my caged penis. I could feel the chastity device dangling from my penis, weighing it down somewhat and bouncing around as I walked.
I spread my towel out and sat down on a beach chair.
Anna stood next to me and removed the thin, wispy cover-up she had been wearing. She wasn't wearing a bikini top, so her breasts were immediately exposed. 
Anna was wearing a small light blue bikini bottom that puckered down the middle in the back, causing it to ride up her ass crack. This had the effect of accentuating her round, ample cheeks, only half of which were covered. She turned away from me as she readied her own chair, bending over and giving me a perfect view of her scantily clad ass. I wanted to avert my eyes, to minimize the intense burning desire for sex, but was unable to turn away from such a captivating sight. The way her ass hung out the bottom of her bikini just inches from my face, begging to be grabbed- finally she turned and sat down. She reached into her bag, produced a bottle of sunscreen, and began to rub some onto her legs. Then she moved to her arms and face.
"Would you mind getting my back, babe?"
"Sure."
She moved over to straddle my chair, sitting between my knees so we were both facing the ocean. I rubbed lotion onto her shoulders, down her back, and across the soft part at the top of her ass. I was pleasantly surprised when Anna scooted backwards and leaned against me, nestling into my arms. She pulled my arms around her, held out my hand and squeezed more lotion out. What she did next nearly blew my mind. She took my hands, guided them to her breasts, and let go. I gulped hard and began massaging the lotion into her pale skin. Each breast was more than a hand full, so her tender flesh moved around fluidly, falling freely from the grasp of my hands as I worked the lotion in. I continued downward and rubbed across her soft stomach. Anna is far from fat, and doesn't have any sort of flab or belly, but she's also no fitness model. More of your average, slightly toned girl-next-door type. I had never liked sharp, defined abs on a woman. I preferred soft to the touch.
Anna moaned as I finished, put her head back and nibbling my ear softly. "That was just a taste of what you have in store later." She leaned back against me with her head on my shoulder, and I rested my hands just under her breasts so I could feel the weight of them on the top of my hands. Anna wiggled her butt against my caged cock.

  A couple approached and we stopped.  I rested my hands in my lap and we faced the ocean side by side.  The couple were talking casually and then it suddenly took a hard turn.  The woman spoke.
"You need to be edged for at least an hour before your next caging.  Just like last night.  Three ruins before lunch.  When this big cock is ready I will curve it in there again, let it expand.  Rest for 45 minutes and then have the maid inspect it and judge it."
I smirked a bit and looked at Anna.  She smiled, and put my arm around her.
The woman's voice became louder and clearer with more sensual tones.
"Then we are going to have you take 7 inches in the ass with the complimentary dildo.  And you should be begging for more.  Seven.  Please.  Repeat it for the new guests."
"Seven" the man said, looking at me.
I looked back in astonishment and somewhat offended he would include me in the conversation, implicating me in some fantasy.  I took a breath, my eyes darting side to side seeking a crowd that of course wasn't there.
The woman was tall, skinny with broad shoulders and a somewhat rigid appearance held his key near his face.  Her musculature eminated a dominant, instructive persona which commanded attention.
"After I've widened you're a-hole, you can be ready for the buttplug.  You will be wearing a buttplug with a dangling symbol of a penis in a chastity belt, and I will be wearing a buttplug with the dangling key container.
She held a blue contained resembling a bean.
"The key goes in the capsule, and it will be tied around the ring of the buttplug, snug against my ass crevice, dangling as an emblem of your dedication to this game we are playing when we walk together.  Everyone will see our declaration from a predatory angle.  From behind us.  Dedicated.  Say it to them."
He turned with some apprehension and a bit of genuine fear. "Dedicated."
His vulnerability allowed for Anna and I to relax, and my situation looked easier and I felt lucky.
I didn't know what to say and my mouth gaped open.  I almost felt myself moan with jealousy of the fantastic notion.
"You two are really into this!" I exclaimed.
The man said nothing and looked blankly ahead.  I briefly looked at his chastity cage and saw red marks on his inner thighs.
The skinny woman began explaining more.
"It was only thirty minutes since Jan's cock was fully erect in my ass.  What do you think about that?" she asked, looking directly at me sharply.
I looked to Anna, but she pointed at the woman's wiggling backside.  She slapped it.  I should have been hard but my cock stayed flaccid.
She sat next to the man who must have been "Jan" and opened the palm of her hand revealing a phone.
"My name is Aphrodite." She said.
"Hi." I said nervously.  I took the phone from her hand.  "I'm Chris."
Immediately my wife excitedly followed.
"I'm Anna."
 "Nice to meet you, Chris and Anna.  Jan's device will unlock and release the key with this app on my phone, and I am giving the app to you, perfect strangers.  At the Ping Pong table, you decide when Jan has fulfilled his duties and release him from this 3 inch cage by opening the keypod app.  You will see his name and the time log of access."
"3 inches.  That sounds wonderful.  Maybe we can make a trade."
I looked at Jan with sympathy.  "I lost my key and they are working on a lockpick."
I thought about the 7 inches comment.
"Hi. I'm Chris."
Jan changed his passive expression to an active one.  It almost felt like his voice, although I hadn't heard it yet, had lowered in pitch.  He reached his hand out.
"I'm Jan."
"Nice to meet you."
Aphrodite apologized for the interruption but explained her impulsive reasonings and risk addiction in great detail, all the while occasionally eyeing my wife which caused me to guard against the couple instinctually.  In a playful suspense my attitude slowly became accustomed to their honesty, and I even glanced at Jan's chastity.
They left and I put the phone into Anna's purse.

We sat and enjoyed the sound of the waves crashing for a while. It was the first chance I had had to look around and take notice of the other beach-goers. I'd say the average age at the resort was early 30's, with quite a few even younger than us. Anna and I are both 28. There were some couples by themselves, but a lot of people also appeared to be there with small groups of friends.
They say once you're at a nudist resort, after about 30 minutes you don't notice anymore that everyone is naked. And that had generally been true during our past visits. Maybe it was my extreme state of arousal recently, but the excitement was not fading for me this time. I couldn't help after Aphrodite's conversation to fantasize about every woman's kinky relationship with their partners. Tall, short, thin, thick, young, old.
Of course, my eyes always gravitated towards those with the "assets" I found most attractive: younger, average build, round ass, medium/large tits. Boy, there were a lot that fit the bill! As for the guys, well, I'm not bi or anything, but i can safely say there were some fit guys there. And Aimee was right; I was amazed at how many blue and black chastity cages I saw! Was this really an accurate section of the population?? It's called "average" for a reason, I thought. All of these guys seem to be really packing! I only saw a few of the smaller colors, green and white. And so far no extremes; clear or red. I was beginning to realize that I really was an exception around here, and not in a good way.