As night deepened, at the makeshift camp of the North Wales Knights, only the crackle of the bonfire and the chirping of insects filled the air.
The knights, their bellies full, had taken turns standing watch before falling asleep, and the Servants inside the carriage seemed to have quieted down as well.
"Maybe I should go catch some sleep, too."
Kay, who had volunteered to tend the fire and stand watch, stretched as he rose.
"My lord… you're not going to sleep yet?"
A sweet voice drifted from behind him.
When he turned around, Tamamo was approaching with her tail swaying. Instead of her usual gorgeous kimono, she wore only a thin slip, her cheeks flushed in a strangely shy expression.
"Oh, Tamamo. You wake up? It's cold—why are you dressed so lightly?"
As Kay moved to drape his outer coat over her shoulders, Tamamo slipped back slightly and gently grabbed his sleeve.
"Um, my lord. It's embarrassing to say… but tonight, for some reason, I need your warmth. I want to… do it… a little."
She whispered in a low voice, bowing her head.
Normally she'd wag her tail openly and pounce on him with a teasing meow, but tonight she was acting so bashful that it felt oddly unfamiliar.
"…Here, at the camp? Everyone else is asleep—how would we even… If we make noise, the knights will wake up."
"That's why… if we slip a little deeper into the forest, it should be fine. Neither you nor I am at risk of being ambushed outdoors. Right? Please…"
Tamamo looked up at him pleadingly and pressed her chest against his arm.
Kay scratched the back of his head awkwardly, but he, too, had felt his desires building after days of tense vigilance since crossing over from the Mage's Realm.
Besides, he wasn't heartless enough to refuse the seductive fox asking so shyly.
"All right. But be quiet, and we'll be quick."
"Ah! Thank you, my lord…!"
They slipped away into the deep, dark forest where moonlight barely reached, careful not to disturb the sleeping knights.
In a clearing covered with soft moss.
Kay laid his coat on the ground and slowly removed Tamamo's thin slip.
In the moonlight, her skin was as dazzlingly white and smooth as always. Kay wrapped his arms around her waist and gently pressed his lips along the line from her nape to her collarbone.
"…Hnn."
Tamamo trembled and let out a short moan.
But something felt off.
If Tamamo's skin usually felt like the warmth of spring sunlight, the body in his arms now was strangely cool and taut with tension.
The touch of her lips and the taste of her flesh were heavier, deeper—different from her usual mischievous sweetness.
"Tamamo? You feel a bit stiff tonight… and your scent's a little different, too."
Kay tilted his head and asked. Tamamo in his arms startled and hurriedly answered,
"A-ahaha… It must be because I'm breathing Britain's real-world air instead of the Mage's Realm! And since we've never done this outside, in secret, I'm… a bit nervous."
Her voice wavered oddly, but Kay chalked it up to stage fright from an outdoor tryst.
"Right? Relax. For now, do what you usually do with your mouth."
"Yes… mmph…"
Tamamo knelt carefully and leaned toward Kay's lower half. The moment she faced his rock-hard, swollen weapon, her eyes widened in disbelief.
Like a beast confronting something enormous for the first time, her breath became ragged and her fingertips trembled.
Then her soft lips wrapped around him.
"…Ugh."
Kay frowned.
Tamamo's usual brilliant, teasing technique—the kind that would steal your soul—was nowhere to be found.
Instead, driven by instinct, she licked and sucked with clumsy, rigid movements. Whenever her sharp fangs brushed him, he shivered.
'Why is she acting so weird? Is she pretending to be a novice?'
Despite his puzzlement, Kay's breathing grew ragged at the raw pleasure of her desperate caresses.
Before long, reaching his limit, Kay grabbed her head and poured his hot, dense white mana into her mouth.
"…! Mmph, mmmph…♡"
Her eyes flew open in shock and pain, but she swallowed every drop of mana without spitting it out.
Licking the milky fluid from her lips, she wore an ecstatic, sweet expression.
"…It's delicious, my lord."
She slowly turned onto the coat and raised her hips.
It was Kay's favorite position and the one where she could best take his weight.
"Here I go."
Kay gripped her hips tightly and thrust himself in one powerful motion.
"AAAAAH!!"
The forest's silence was torn by her scream.
Trying to stifle pain, she gripped the earth beneath her. Kay felt again a strange tightness—unlike anything normal.
But instinct ruled. Panting like a beast, he began to explore her depths with merciless force.
"Hah, haa…♡ deeper… aaah!"
Though in pain, she matched his ferocity, gripping him tighter.
Her moans were low, beast-like, and filled with anguished desperation, so different from her usual gentle coos.
The woman panting beneath Kay was not Tamamo.
It was Alter, using Tamamo's perfect transformation and illusion magic to wear the fox's guise.
'Ah, Kay…♡'
Alter felt on the verge of losing her mind from the overwhelming shock and pleasure striking her from behind.
Though her head played novice, her body melted helplessly under this violent ecstasy. Each time Kay's sweat fell on her back, she silently called him hundreds, thousands of times.
Alter knew: her inflexible big brother would never embrace her as a true woman.
As long as she remained his sister, he'd only ever see her as the cute little sister.
That humiliation was unbearable.
So she swallowed her pride, bowed to the seductive Tamamo she'd battled earlier, and begged for the magic.
If she could be loved by Kay, if she could bear his seed, wearing another woman's skin and playing the whore was nothing.
'Even if it's a lie… even if it's deceit…'
Alter scraped the ground until her nails bled, welcoming the pleasure.
'If I can fill myself with Kay like this…♡!'
Finally, at the edge of ecstasy, Kay growled like a beast and poured his heavy, hot seed into her deepest depths.
"AAAAH♡♡♡!"
Alter's trembling body cried out in rapture.
Kay's life force, hot and pulsing, filled her womb.
Overwhelmed by possession and fullness, tears of joy and tenderness streamed from Alter's true eyes beneath the illusion.
It didn't end with one. They changed positions and continued again and again.
And finally, another release of white mana to her.
That life-filled mana scattered, and Alter tasted it in ecstasy.
As the dawn mist cleared and morning approached, Kay returned to the carriage after their clandestine affair and collapsed into deep sleep from exhaustion.
In the furthest corner of the carriage, the real Tamamo, disguised as Alter, pretended to sleep.
Holding a small hand mirror, Tamamo dispelled the illusion; the fox's mask fell away, revealing the sweat-drenched face of the true Alter.
"Well done, sister-in-law. For a first time, that was quite intense, wasn't it?"
Tamamo teased with a mischievous grin, handing her a wet towel.
Alter, cheeks flushed, took the towel and wiped herself. The traces Kay left on her lower belly brought an irrepressible smile to her lips.
"Truly, it was what I always dreamed of… no, it was even more horribly wonderful than any dream♡"
Alter murmured, caressing her lower abdomen tenderly. Her gaze was that of a girl in first love, not a tyrant.
"I owe you a great debt for this. I'll take back calling you a beast. I'll compensate you handsomely—even if I have to raid North Wales' warehouses later."
"Oh, no need for reward. I completely understand a woman's desire to monopolize her beloved milord. Sharing the same master, a little favor like this is only fair, isn't it?"
Tamamo giggled coyly, covering her mouth with a fan.
"But, sister-in-law, when do you plan to reveal this enormous secret to milord?"
Alter gazed at Kay's broad back as he slept soundly.
"I have no intention of revealing it anytime soon."
Alter answered softly.
"When we reach North Wales, I'll first share this joyful news with that irritating Lancer—shatter his mind by telling him I was the first to bear my brother's seed… and only then will I tell Onii-chan."
The fact that she had become the sister most physically cherished by her brother made Alter's heart pound with triumph and guilt.
"I know it's wicked. But Kay would never truly embrace me. I know it's selfish and despicable, but this is the Pendragon way."
"Wow, just like a trash father's method~"
Even in distant Egypt, Nephthys, who loved Osiris, transformed into Isis to sleep with Osiris behind her husband Set's back. It's the Pendragon family tradition—or rather, a mythic tradition.
Alter felt guilt toward Kay, but more than that, she yearned for his love. After all, they weren't blood.
Unaware and snoring softly, Kay's future faced a whirl of jealousy and bloodshed more dizzying and terrifying than any Mage's Realm training.