Robin stood and marveled at the fine contraption, just recently erection inside of their room. The craftsmanship was exquisite, but nothing less was expected when Franky was involved. The large X-shaped, wooden object leaned slightly backwards against the wall, padded by many lean, leathery cushions. Cuffs were positioned at the end of each plank, meant to secure a person's wrists and ankles. There were even some soft straps for the thighs and waist, just to prevent any unwanted movements.

Nami, on the other hand, was getting more and more nervous. She had pondered deeply on the deal the two of them had made and seeing Robin go to such an extent, just to satisfy her wicked need, made her both scared and aroused at the same time. Beneath her skirt, Nami could feel her cock grow from the mere thought of being tied up in that thing. She wouldn't be able to stop Robin from doing whatever she wanted.

She glanced, briefly, over at the archaeologist and saw that wide, wolfish grin on her blushing face. Robin was no doubt extremely pleased with what the cyborg had made for them. Her arms were folded over each other, gently pressing against the underside of her ample chest. It made them look even more impressive than they already were and Nami found herself staring at them like a dork. Luckily for her, Robin was far too busy admiring her new toy to even realize what was going on.

"Will this do?" Franky asked bluntly.

"Yes. Anything else and it would only get in the way." Robin replied, eyes still fixated forward.

"Even thought I'd love to add some additional features to it, I'll leave it per your request, Robin!"

"Thank you, Franky."

"I'll collect the payment later, then. You two suuuuuper enjoy yourselves now!" Franky gave out a hearty laugh as he made his way out of their room, closing the door behind him as he left.

"You are being awfully quiet, Nami. Is there something that is bothering you?" Robin asked, keeping her voice soft, hiding any apparent excitement.

"Oh I'm just thinking about all the things I'm going to do to you once it's my turn..." Nami replied, doing an equally fine job at hiding her own thoughts and feelings.

"Mmm... I can imagine you having many wonderful and naughty ideas inside that head of yours." Robin paused briefly. "But let us not get ahead of ourselves, because you will need to survive what I have got in store for you tonight first..."

"..." Nami didn't reply, she was far too busy hiding her growing excitement. She wasn't shy, far from it in fact, but she wanted to prove a point and stood her ground against this overwhelming, sexual being that stood in besides her.

"Oh my... I had completely forgotten." Robin placed the palm of her hand against her cheek, trying to look worried. "We should probably test it out before using it later."

"I'm sure it's fine." Nami replied. "It's Franky after all. I'm sure it works as intended."

"But what if it is not comfortable?"

"..." Nami narrowed her eyes and tried to decipher whatever Robin's face was hiding.

"It would be a shame if we had to interrupt our fun because of any stress put on your body."

"Well... You're not wrong." Nami couldn't lie, it was a valid concern. Not even Franky would know if the padding on the contraption was too much or too little for her own personal preference.

"Of course I am not wrong." Robin nodded. "We have to try it out and make sure that all is well.

"And you want me to test it?"

"You are the one that is going to be tied up, so it is only natural that you should do it.

"Fine..." Nami sighed and reluctantly walked up to the wooden X and turned around.

"You need to undress first."

"W-what!? Why!?"

"We cannot properly test it unless you are naked, silly."

"Right..." Nami did as Robin said and reluctantly began to undress, tossing her clothes to the side. Once nude, Nami stood with her back against their new toy and waited for further instructions, making sure to cover her erect penis for as long as she could.

"Oh my... Aren't we excited?" Robin smiled and walked up to Nami and gestured her to spread her legs. Robin slowly wrapped the restraints around Nami's many limbs, taking her sweet time with tying her up. Once every cuff and strap had been neatly secured, Robin took a few steps back and just stared at Nami. "How does it feel, Nami?"

"It's a bit embarrassing, but it's not that bad... It's kind of nice, actually." Nami smiled, she could get used to this. "Well, now that we know that it works, you can go ahead and untie me now."

"..."

"Robin? A-aah!? W-what are you doing, Robin!?" Nami felr Robin's warm hand caress her rigid length, teasing her with a few light rubbings. "S-stop... Untie me!"

Robin wasn't listening; she was far too busy feeling up Nami's wonderful cock. It's not like she was going anywhere, so why not just enjoy it while it lasted? She leaned in and placed her tongue just under the engorged tip and slowly wrapped her lips around it. The sweet taste and sensation of a pulsating cock-head trapped inside her mouth had Robin quiver with delight. A lewd moan escaped her throat as she twirled her tongue all over her meaty treat.

She could hear her friend complain and object to this sudden outburst of sexual activity but, even though Nami did her best to get free, she just couldn't do anything about it. The restraints sat tightly around her, restricting her movements to the point where she could only wriggle slightly. It was such an empowering feeling to have someone tied down to this degree, and Robin was going to get all she could out of this moment of opportunity.

Her mouth sucked on the eager limb, taking more and more of it, deeper and deeper with every bob of her head. The hand she had used to tease Nami was moving down the length, all the way to her dangling testicles. Robin cupped her hand and lifted the heavy balls, weighing them in her mind. Despite not being able to accurately determine the amount of semen Nami had stored away in her sack, Robin could pretty much tell how back up she was. Unfortunately, these testicles didn't have nearly the amount that would satisfy Robin, but that could be easily fixed.

"Aaah..." Nami moaned as she looked down on Robin. Watching her cock being sucked was incredibly hot and arousing. Robin was so good at what she did; there was no doubt about that. "C'mon, Robin... You've had you f... Aaaah... Fun! Let me go..."

The only response Nami would get was the slurping sounds of Robin's mouth going to town on her throbbing cock. Not a single gesture was given that Robin even cared to what she had to say. Her tongue lapped away with increased vigor as Nami erection was plunged into the wet, slippery tightness of her friend's gullet. As Robin deep-throated her pulsated dick, her hands began to pull and squeeze on Nami's testicles and teasing her wet cunt. She seemed determined to make the navigator cum as hard and fast as she possible.

Nami was gasping and moaning as she tugged on the restraints, doing whatever she could to deal with the intense pleasure and sensation being forced upon all of her most sensitive areas. Her toes curled up and her hands desperately grabbed on to what little surface they had access to as her balls began to tense up. Robin showed no signs of stopping, she just continued to slurp away on Nami's cock, still pulling on her aching balls.

"Aaaahh!! I'm... I'm going to cuuuum, Robin!!"

As if sealing her own fate, Nami screamed out her impending orgasm, giving Robin ample time to retreat from the now pumping cock. Nami groaned as all the pleasure stopped, leaving her stuck on the very brink of an earthshattering ejaculation. Her testicles pumped furiously, but no semen was released. Her cock jumped, but only precum drooled out. It was a maddening sensation, one that she had been put through so many times.

"Please please please please please!" Nami desperately moaned. "Pleeeease make me cum!"

"Fufufu... But I thought you wanted me to stop?" Robin grinned, getting up on her feet.

"No no no no no... Please continue... I need to cum so badly!"

Robin just smiled at Nami and turned away from her, walking towards the nightstand beside her bed. She opened one of the drawers and picked up some strange objects that Nami couldn't identify from that distance. As Robin walked back towards her, her intentions became all too clear to the poor cat. She had used those items several times before, and even though the results had been out of this world, the frustration leading up to it was nothing short of insanity.

"No... You wouldn't..." Nami's voice was trembling.

Again, Robin didn't say a thing, but just went back down on her knees and positioned herself right in front of Nami's needy cock. She placed the items down on the floor and gave Nami a tender kiss on her drooling tip. Robin grabbed two items from the floor and reached for the heavy testicles in front of her. She pulled on Nami's balls and a loud click was heard. A large, weighty and thick metallic ring had been placed just above her aching nuts. The ring pushed them down and forced them away from her crotch, causing a constant frustration inside them.

The second item was pretty much the same, but this ring was far less thick and not at all as heavy. Robin placed it at the base of Nami's cock and locked it in place, making all her veins begin to pop out and become much more pronounced. The third object was the worst part of it all. Nami had often referred to it as "vile and sadistic" and was something could be very dangerous in the wrong hands. Of course, when used corrected, it would send Nami into frenzy of sexual satisfaction, but only after going to through hell and beyond to get there.

Robin picked up the item and squeezed down on it. Out came a thick, clear liquid, pooling into the other palm of the archaeologist's hand. Once a sufficient amount had been extracted, Robin just looked up at Nami and gave her the most sincere and gentle smile as she could. Nami was already starting to sweat as the liquid-covered hands reached for her throbbing member. The very second the substance made contact with her, Nami began to grit her teeth as both pleasure and frustration swept across her cock.

The hands wrapped around her member, massaging it and spreading all that slippery stuff all over her length. With every second that passed, the frustration increased at a frightening pace and caused Nami to instinctively pull and tug on the restraints once more. Lewd sounds of masturbation filled the room as Robin continued to smear the liquid all over Nami's now growing sex. It was already at an impressive size, but thanks to this substance, the navigator's penis was expanding further than what she was normally capable of.

"Oh my, would you look at that..." Robin said. "I should bring a ruler with me next time; this has to be the biggest you've been so far. At least ten or eleven inches..."

"Ffffuuuuckk..." Nami groaned, arching her head back, tensing up her entire body.

"Mmm, good girl." With a final stroke, Robin pulled her hands off of Nami and watched her dick jerk in the air.

As Robin wiped her hands clean on the piece of cloth she had brought, she contemplating on her actions. "Oh, that's right..." She thought and chuckled slightly. She had done it in the wrong order. Robin picked up the fourth item from the floor and pulled it out of its wrapping. She placed it between her teeth and brought her mouth to Nami's cock. The condom folded neatly over the red, swollen tip and rolled easily over Nami's entire length.

Without wasting much time, Robin stood up on her feet, with the two last items in her hand. She looked, briefly, at Nami and her wonderful expression. It was deliciously twisted into a mess of excruciating pleasure and agonizing frustration. Robin could look at her for hours, but she quickly brought the fifth item up to Nami's face and pushed it inside her mouth. The ball-gag wasn't enormous, but was sufficiently big to prevent her from making too much noise, or accidentally biting down on her tongue when the pleasure would prove too strong.

"Mmmph!!" Nami protested, but Robin just smiled back at her and tightened the straps to the ball-gag.

Lastly, Robin raised the blindfold and dangled it in front of Nami, teasing her a bit before placing it in over her eyes. Unlike the ball-gag, it could just be placed around her head without much effort, which was really convenient as Nami began to thrash with her head. Her rebellious behavior was really cute, Robin thought, it really suited the little cat. But, ultimately, it was all in vain. She was going to endure it whether she liked it or not; tied up on a giant, wooden X, gagged, blindfolded and with her big cock trapped inside a tight condom.

If this was all Nami was being forced through, she wouldn't be so desperate to get loose. No, it was the cock-rings and that sadistic liquid that had her thrashing so wildly. The rings were there to make sure that Nami didn't have any unsuspecting ejaculations and served to deny any such accidents while the liquid did its magic. They normally only used these toys separate, especially the liquid, to not make things a bit too intense. But this time, however, Robin felt like Nami was ready for the next step.

"Mmm..." Robin moaned, stroking her hand over her own rigid length. She leaned in towards Nami and whispered into her ear. "I will be back once your cock has sucked in all of that nice liquid, so be sure not to go completely insane until then..."

"MMMMMPH!!" Nami screamed and whimpered as loudly as she could. Her cock felt like it was on fire. It throbbed and jerked violently as the liquid slowly seeped into her skin. She could feel her member strain inside the tiny condom, stretching it as her erection grew bigger and bigger.

"Don't worry, though, I'll leave the door open so you don't have to feel all alone..." Robin gave Nami a kiss on her cheek before slowly walking away from her.

The words echoed inside Nami head, along with the slow footsteps of Robin's departure. "Did she really say what Nami thought she said? Or did her brain just make it all up?" Nami thought to herself. "No, she wouldn't..." Without being able to see a thing, Nami could only hear the rustling of clothes and then, a moment later, a door being slowly pushed open. Wind blew in and swept across her body, sending shivers down her spine as it brushed around her naked balls. Listening to the best of her ability, through the constant torture of her situation, Nami could never hear the door closing.

Nami whimpered and strained in her bonds; she would've had her second orgasm by now if it wasn't for those bloody rings. She swore bloody murder inside her head as the sudden realization of being completely exposed was brought up in her mind. Anyone could literally see everything if they just happened to walk by. The thought was pure torture, and only caused her arousal to increase even further. It was an endless, maddening loop of torturous frustration and intense pleasure.

Unbeknownst to Nami, Robin did actually shut the door after her, but had done so very carefully. She would never do something that cruel to her friend. No, she had already done enough by placing Nami in that delicious and torturous position. But even so, she knew that Nami wouldn't want it any other way. As the archaeologist made her way to the deck, she tried her best to calm down and hide her massive excitement, even though that was almost impossible.

Normally, the liquid known as "Bull's hell," was used for men with disabilities that prevented them even the most basic of pleasures. But used on a healthy person (which had become it's actual use), especially on a cock, the results were a bit more intense. Basically, it worked as both an aphrodisiac and as a stimulant, bringing the person up to unnatural heights of arousal and sexual frustration. Once the skin of the cock had absorbed it, pleasure beyond your wildest dreams would surge through your cock and force it into a state of constant stimulation.

It usually takes between ten to fifteen minutes before the liquid would be absorbed. After that, it would only be a matter of minutes before the subject would be pushed over their limits and make them ejaculate like no tomorrow. It was a perfect tool, one of many, for Robin and all her sadistic needs and ideas, and Nami was the perfect person to use them all on. And now, the poor girl was tied up in their room, her vision stripped and was now going to endure several hours of pure torture; and the best prat was that she wouldn't be able to cum even the slightest drop of cum.

Robin was aching. She needed to stroke her cock and finger her pussy so very badly, but she wanted to save it for later. Yes... She would wait until Nami's cock and balls were ready for the blowjob of their life. "Ooh fuck, Nami... Please endure it like a good girl so I can taste the results of your torments..." Robin said to herself, feeling her face burn with a bright red. She didn't even bother to hide the giant bulge on her dress anymore. She removed her hands and let her cock push against the fabric. Who cares if anyone saw her, they would all find out eventually anyway. Robin brought her hand down to her dick as gave it a few tugs. "I can't wait to drain your cock and balls of all that delicious cum, Nami..."