It's Not Because of the Curse
It's not because of the curse. The symptoms of the curse had worsened. To alleviate them, the two of them needed to stay close together for the time being. That was Lua's explanation—she would inform those around them accordingly, and so they should share the same room.
“W-well, that would be nice. It's not even a lie...” Sia lowered his gaze to look at Lua's member. It stood fully erect as if in agony, twitching and jerking.
“If it becomes known that the Grand Duke possesses such a monstrosity, it would cause problems. Yet if I wander around looking for you in this state, someone might discover it.”
“So... that means I-I should come to your room whenever you need me...?”
“Correct.” Lua nodded.
“Is it really okay to share a room with someone like me?”
“We siblings have never once shared a room, even from when we were very young.”
“Yeah... Father was afraid my incompetence might rub off on you.”
“...Did he truly say it that way?”
“I-I understand Father. That's why I'm happy to finally be useful like this... Ehehe.”
Lua watched her older brother's bitter smile with a heavy heart. The previous Grand Duke had always been a gentle father to her. She had known he was harsh toward her brother, but she never imagined he had spoken in such terms. The reason Sia had grown so timid wasn't only because he had become a woman—Father's influence had come first.
“Brother. This isn't... just for your usefulness...”
Lua had meant to say she wasn't proposing they share a room solely because of her brother's utility.
Twitch—
“Ugh...”
But maintaining her sanity was growing impossible. Simply breathing in her brother's scent made her cock feel ready to burst.
“A-are you all right? Should I pull it out now?”
Noticing Lua's state, Sia reached out. But Lua stood and stepped back.
“N-no, it's fine.”
“But that looks incredibly painful...”
“I'll handle it myself. Brother, please just watch.”
“J-just watch?”
“Having you before my eyes is more than enough...”
Because it makes me so fucking horny. Lua kept the words unspoken.
When Lua lifted her skirt completely, her massively swollen member sprang into view. As if venting its resentment at being caged for so long, it dripped thick strings of precum like tears. The mere act of presenting it before her brother sent such pleasure surging through her that Lua's face twisted in torment.
“Haa... haa... ngh♥”
“I-I want to do it for you myself...”
“Your stamina isn't the best, is it, Brother? We'll likely need to do this again tonight, so...”
“Ah, I see. You're telling me to save my energy.”
Only then did Sia nod in understanding. In truth, Lua had simply wanted to be considerate of her brother. But unless she framed it as something that benefited her too, he would keep worrying.
“Hngh... ngh...♥”
Lua began working her massive shaft with both hands. Watching the sight, Sia let out a silent whoa of admiration.
Squish, squelch, slurp, squeeze.
It was something Sia had once possessed. An act he had performed himself. It should have been the same, yet it looked utterly different. He had never needed both hands because of sheer size, nor had he ever worn such a blissfully sloppy expression. Compared to a magnificent male like that, wasn't I basically a female from the start?
Another strange thought rose, and Sia shook his head vigorously.
“Um, Brother...”
“Yes?”
“It seems... I may need a little help after all...”
Having learned the pleasure of another's touch, his cock no longer seemed satisfied with its own efforts. The Grand Duke had no time to waste dozens of minutes on masturbation here. Lua decided she needed to add more stimulation.
“O-of course. Should I use my f-feet again?”
Feet! Soles! Toes! Brother's filthy, lewd feet!
She nearly lost her mind for a second, but Lua barely managed to think of something else.
“Your hair...”
“My... hair?”
“Yes. I'd like to borrow it.”
With hands slick from precum, Lua grabbed a thick handful of Sia's pink locks. The memory of having his hair yanked during oral sex made Sia's body flinch.
“Ah, I'm sorry. Did that hurt?”
“N-no. It's fine. Keep going.”
Lua didn't fully understand why Sia grew his hair so long, but she had always thought it suited him perfectly. Those floor-length pink tresses only made her brother's beauty even more breathtaking.
“Sorry for dirtying it.”
“I-I can just wash it later.”
Lua wrapped her monstrous member in the hair. There was more than enough length to coil around it several times over.
“Mmm...♥”
When she resumed stroking, the stimulation was exquisite. The sticky sounds of precum mixed with the soft rasping of hair. The silky smoothness against her palm harmonized perfectly with the slight roughness of the strands. As the hair soaked through, the scent of Sia's shampoo rose in a thick wave. The olfactory assault alone made her cock throb violently, as if it might explode.
“Ah... I'm going to c-cum...♥”
“T-then cum on my face like that.”
“Y-yes? But...”
“It's fine since I can wash it. And you like it better that way too, right...? I was a man once, so I k-know a little about that.”
Sia knew far more than a little. Men wanted to satisfy their conquest lust by defiling women. Lua wanted to deny those words. She wanted to say she had no desire to soil her brother. Yet despite her feelings, the Grand Duke's magnificent cock responded with raw honesty to its desire.
“Kngh, ugh...!”
Splat— splat—
“Hngh...!♡”
The spurting semen slammed into Sia's face. It was closer to being struck with it than simply receiving it. Even though we used to be the same kind of man, this is so different...♡ Overwhelming masculine potency that could arouse a female body with nothing but the sight of it.
“Agh...♥”
Splurt—
“Kyaa...!♡”
The sight of Sia moaning cutely while taking the load on his face was so arousing that Lua came again. Caught completely off guard, Sia could only squeeze his eyes shut against the surprise attack.
“Ah...♡”
The thick, sticky male scent flooded his nose. Sia felt an itching heat in his lower belly and between his thighs. But the chief physician had said it was still within controllable levels.
I am... I am only Lua's older brother...
It was merely physiological arousal caused by having biologically become female. He repeated to himself that he wasn't truly feeling such things toward his little sister or the Grand Duke's cock.
“Haa... haa... B-Brother.”
“Y-yeah...?”
When Sia looked up at Lua's call, he was startled. Even after releasing such an enormous volume, the Grand Duke's member remained rigidly erect.
“I'm sorry. Because of the curse... my sexual urges have grown too strong...”
Lua realized her slip of the tongue. Saying it was because of the curse was essentially the same as saying it was because of her brother. Though true, she worried it sounded like she was shifting blame and would burden him.
Yet Sia only blinked, showing no sign of displeasure.
“Huh? Lua. Didn't you hear it from the chief physician?”
“What?”
“They said the increased sexual desire isn't because of the curse...”
The chief physician had sent a report, but her erection had made concentration impossible and she'd only read the conclusion. Had there been such details in the parts she skipped?
“What do you mean...? My lust suddenly became strong enough to make me lose my mind, and you're saying it's not the curse?”
“It's not that the curse s-strengthened the sexual desire. It seems to have w-weakened self-control instead. It might sound like the same thing, but...”
Lua understood what Sia had been about to say. Strengthening desire or weakening restraint both ultimately caused one to lose reason to lust. But the former created desire where none existed, while the latter simply prevented hiding desire that had always been there. In other words, the fact that Lua was frantically jerking off like a beast toward her own brother simply meant her true feelings had been laid bare.
“N-no! I would never... toward Brother...!”
Lua tried to explain, terrified of earning his contempt.
But Sia waved both hands, trying to calm her.
“I-I'm not misunderstanding, so don't worry. Even if the desire itself didn't increase, they said the d-direction might have become twisted. Like s-sexual preference or something.”
“...Right? That must be it, surely?”
“It must be... right?”
In truth the chief physician had never stated it with certainty, but both of them naturally assumed it must be so. If not because of the curse, how could siblings possibly feel sexual impulses toward each other?
“A-anyway, shouldn't you finish the rest?”
“Ah, y-yes.”
The Grand Duke's tireless cock only began to droop after releasing four more loads. Sia was an absolute mess, completely covered in semen. Not only his face and clothes—his hair was now clumped together in thick, sticky strands.
The sight that seemed to declare he was the Grand Duke's possession was so arousing that Lua felt herself growing hard again.
“I-I need to wash quickly. Before Angelica sees.”
Sia stood, brushing the thick semen from his hands. Being discovered by Angelica was bad enough, but if he kept smelling this scent any longer he felt he would truly lose his mind.
“...Brother.”
“Yes?”
Lua clasped both hands over her large breasts and gazed at him with cautious eyes.
“When I suggested we share a room, it was never only for my own sake.”
“Huh?”
“What I was trying to say earlier... is that since we never shared a room as children, it feels like we're finally reclaiming those memories, and that makes me happy.”
“Ah, aah! I like it for that reason too! Ehehe.”
“And if you're with me, you'll naturally receive treatment equal to the Grand Duke. The attendants and guards will follow me, which means they'll stay close to you as well, Brother.”
“I-I see. So Lua was thinking of me, but I didn't realize.”
“Ah, I didn't say it so you would realize. Still... if you do, I'd be glad.”
“Yeah. Thank you, Lua. This makes me feel like I've become the Grand Duke's wife or something. Ehehe.”
“...Wife?”
“The Grand Duchess receives treatment on par with the Grand Duke in that way...”
Sia belatedly realized what he had just said. Both their faces flushed bright red at the same time.
“N-no! It was just a figure of speech! It absolutely doesn't mean our relationship is l-like that or anything!”
“I-I didn't misunderstand either! ...Absolutely not.”