No matter how vivid a memory is, humans eventually develop a tolerance for experiences they have already undergone. If the same act is performed repeatedly, the stimulation loses its edge; to maintain the same impact, one must strike harder.
The problem was whether that would create memories so deep they might actually harm Chisato Hasegawa. To avoid that risk, it was better to forgo intensifying the shock and instead focus on increasing her threshold for such acts by making them habitual. This meant repeating the experience until it became second nature.
This logic applied not only to Chisato but to all the girls. Fortunately, Ethan and his companions were far from ordinary. As long as things didn't go too far, physical injury wasn't a concern; they only needed to keep pushing the boundaries of their limits.
One might think Chisato would find such rough treatment painful or distressing, but the reality was quite the opposite.
"Mmph? Nng... chu... slurp... ahh... lick?"
The beautiful, sexy black-haired school doctor found joy even in the mistreatment, blissfully surrendering herself to the sensation. Her total immersion only served to heighten Ethan's own excitement.
"Ugh... ah...!"
As he finally reached his limit, he released a thick torrent of life essence into her mouth. The sheer force of the climax made his member twitch violently against Chisato's tongue.
"Mmmppphh————!"
Chisato accepted every drop with greedy devotion.
"Nng... chu... haa... slurp..." After meticulously cleaning him off, she looked up at Ethan, her eyes shimmering. Ethan slowly pulled back, withdrawing himself from her mouth.
"Show me," he commanded.
Chisato sat back on her heels, kneeling in a submissive posture with her hands resting on her thighs. She tilted her head up.
"Mmm... ah..."
She displayed her tongue, piled high with the thick, cream-colored essence of Ethan's vitality.
"Good. Swallow it."
"Nng! Gulp... ahh... mm... gulp! Haa..."
With every contraction of her throat as she drank the fluid, her hips and buttocks shuddered in rhythm. Once she had finished, Chisato exhaled a rapturous breath and tucked a stray lock of hair behind her ear.
"Well, Tachibana... I told you about my relationship with Ethan a long time ago. How does it feel to see it with your own eyes?"
She looked at Nanao, who was slumped on the floor, and offered a serene, almost taunting smile. Nanao, lost in a daze, offered no response.
This kind of thing... this kind of thing...
Nanao had imagined many things about what Ethan and Chisato did together, but the reality far exceeded the limits of her imagination. Just watching had made her entire body burn with unquenchable heat, leaving her mind hazy and her consciousness drifting.
"What are you so afraid of, Tachibana? Come... if you want to become a woman, now is the time."
"!... I-I'm coming..." Spurred by Chisato, Nanao scrambled to her feet. "Wait... th-that's strange...?" Her legs were completely weak; her knees shook so much she could barely stand.
Seeing this, Ethan stepped toward Nanao and silently extended his left hand.
"Ah—..."
Nanao looked at his hand and swallowed hard. Even an innocent girl understood the consequences of taking that hand. What Ethan had just done with Chisato would happen to her. She hesitated.
Chisato leaned hungrily against Ethan and whispered, "If you aren't ready, then I suppose I'll have to show you our relationship in an even more intense way... shall I?"
Chisato's declaration finally pushed Nanao past her hesitation. She reached out and firmly grasped Ethan's hand. At that moment, the erotic ritual to turn Nanao into a complete woman began.
"Uh... should I start?" Ethan asked, feeling a slight bit of awkwardness.
"Mmm... yes. Please."
Nanao replied with a deep blush. She was wearing a girl's sailor uniform and feminine lingerie, but perhaps due to her nerves, her body hadn't fully transitioned into its female state. Ethan wasn't quite sure where to begin.
The goal was to use intense stimulation to "lock" her body into a female form. Given her unique circumstances, if he followed the usual slow steps, her body might resist the change.
Ethan took a deep breath and shifted his mindset. He decided to view Nanao as a woman who had already submitted to him—just like Maria the succubus. He was her absolute master, and he needed to make her surrender completely.
"Nanao."
To ensure things proceeded smoothly, Ethan used an intentionally cold tone. Nanao flinched but managed to whisper, "Yes."
Ethan continued, "Lift your skirt with your hands... let me see the parts of you that have become a woman."
"Wh-! ...Alright."
Despite her overwhelming shame, Nanao nodded. She followed his instructions, pinching the hem of her skirt with her left hand and slowly lifting it. Gradually, she revealed her cute, red lattice-patterned panties. In the process, her body naturally and completely shifted into a female form.
"...I-Is this okay?" she asked, her face crimson.
"It is," Ethan replied. "Now, keep going."
"Eh?"
Seeing her confusion, Ethan clarified the true meaning of his command. "Didn't I say I wanted to see the parts of you that turned into a woman?"
"S-So soon...?"
Nanao took a few staggered steps back. Her expression made Ethan hesitate for a split second. He could stop now and explain his intentions to put her at ease, but the cost would be losing the effectiveness of this method. If he didn't push through the shock, the therapy would fail.
Ethan sighed intentionally. "Nanao, you just need to be as obedient as Chisato. If you don't cooperate, this isn't going to work."
He closed the distance between them. Nanao retreated until her back hit the wall. Ethan slammed his hand against the wall beside her head, trapping her in a classic "wall-slam" pose.
"Do you want to give up?"
"........."
Fearing that Ethan might actually walk away, Nanao eventually nodded silently. She didn't say another word. She steeled her resolve and reached under her skirt.
I have to do exactly what Ethan-kun says, she thought. He's right. I'm the one who asked for this. It's not fair to ask him to be gentle just because I'm embarrassed. He's doing this for my sake.
Nanao hooked her thumbs into the elastic waistband of her panties. Blushing furiously, she pushed them down, exposing her most private areas to the air.
The air...! The sensation of the cool room air brushing against her skin made her heart race. She pushed her thumbs down further, until her panties were bunched around her knees.
She then pulled the hem of her skirt up even higher. "Ethan-kun, look... my body has become a girl's..."
Just as she looked up to see his reaction, Ethan suddenly grabbed the collar of her shirt.
"Huh—?"
Ignoring her shock, Ethan yanked the zipper of her sailor top all the way down with a sharp zip! The force caused her bra clasp to snap open, and her pale, perky breasts spilled out.
But Ethan wasn't aiming for her chest yet. He slid his hands over her collarbones, pushing the uniform off her shoulders until it hung around her upper arms. Her pale throat was now fully exposed. Before the thought of what came next could even form, Ethan's lips were against the side of her neck.
"Ah! Ethan-kun—ah! Ahhhhhhh!"
Before she could even finish his name, she arched her neck and let out a high-pitched, lewd moan. Ethan sucked hard on her neck, sending a wave of sweet, terrifying pleasure through her. He didn't stop there; he pressed his thigh firmly into her crotch and began to knead her exposed breasts with both hands.
The realization that she was feeling "female pleasure" hit her like a tidal wave, crashing past her limits.
"No... haa... ahhh... haaaaa!"
A torrent of ecstasy surged from deep within her. Nanao found herself wrapping her arms around Ethan, her entire body twitching and shivering.
Oh god... I'm just like Professor Hasegawa now...!
Even though she had only watched Chisato for a short time, she had seen the way the calm school doctor had transformed into something primal and erotic under Ethan's touch. Now, she was the same.
The stimulation was particularly intense for a vampire. Their necks were a point of obsession; being sucked and licked there triggered a powerful biological response. Combined with her first time in a fully female body, Ethan's simple kiss on her neck sent her spiraling into a staggering climax.
When she finally caught her breath, Ethan and Chisato guided her to the bed, sandwiching her between them.
"Come, your mind is ready. Now we lock your body in place. Take off the rest of your clothes... be a good girl."
"O-Okay... ah..."
The remnants of her uniform were stripped away in seconds. Her useless bra followed, leaving her upper body completely bare.
"Ah... ah..."
Nanao moaned softly, overwhelmed by shame. She noticed her nipples had already swollen into hard, inviting points. "I hate this... don't misunderstand... I-I didn't mean to..."
She tried to cover her chest, but Chisato reached from behind, gently pulling her arms back and pinning them up, exposing her torso completely to Ethan's gaze.
"Hehe... why be shy when we're already in bed?" Chisato whispered in her ear. "There's no need to hide. You've worked hard to make this happen. It's time to let go and liberate yourself."
"Liberate... myself..." The words sank into Nanao's heart, and her tension began to melt.
"Chisato-san..."
Ethan's eyes flickered with a hint of concern; he didn't want this to feel like hypnosis. But Chisato remained serene. "Don't worry, leave it to me. If she didn't want this, no one could force her. I haven't used a drop of power."
It was true. Nanao was simply using Chisato's words as an excuse to give herself permission.
"Tachibana, do you feel your body getting hotter?" Chisato asked.
Nanao nodded vigorously. A sweet heat was swelling deep inside her.
"That is the feeling of being a woman... a feeling you've suppressed until now. Ethan is going to make that feeling grow many times over. But you can't just be passive. You have to ask for it, just like I did. Can you do that?"
"...I can... Professor..."
"Good. Now, look closely at the man in front of you."
Nanao obeyed, staring at Ethan. He was completely naked. His powerful, well-built body and the massive weapon between his legs were right in her line of sight.
"Ethan-kun..." she whispered, a shiver running down her spine. She was afraid, but the pleasure was stronger. The shame vanished, replaced by pure female instinct. "...Please. Come to me."
"Understood," Ethan nodded. "I will turn you into a complete woman."
And a woman who belongs entirely to me, he added silently.
The ritual began. The small bed became a classroom for Nanao to learn the rules of pleasure. Despite her lack of experience, Ethan and Chisato showed no restraint. Ethan sucked greedily at her swollen nipples while Chisato reached into her bunched panties to knead her buttocks.
"Haaa! Haa... mm! Ah...! Haa... ah! Ahhhhh!"
This was on an entirely different level than the kiss on her neck. Nanao's mind and body were branded by countless orgasms in a matter of minutes. The pincer attack from both Ethan and Chisato uprooted the last of her logic, dragging her into the abyss of carnal delight.
"Haa... ah... nng?"
Nanao's face was lost in a trance, a total captive to the pleasure they provided. Having climaxed so many times, her panties were soaked through with nectar, and the bedsheets were stained with the marks of her arousal.
Under their tutelage, she no longer felt ashamed of her state; she felt proud of it. When Ethan turned her around and began to fondle her breasts from behind, she was fully immersed in the happiness of being a woman.
"Now, Tachibana. You can't just keep all the pleasure for yourself," Chisato teased, poking Nanao's forehead. "How long are you going to make Ethan wait?"
Only then did Nanao feel the hard object pressing against her back.
That... that's Ethan-kun's...
She knew exactly what it was. Chisato smiled. "You haven't forgotten what I demonstrated earlier, have you? Can you do it?"
"...I can."
Nanao nodded and turned around to face Ethan, her eyes melting with lust. "I'm sorry... I was only thinking about my own pleasure. I want to make you feel good too. May I?"
"Of course," Ethan replied.
"This is my first time... so you have to tell me what feels good, okay?"
Nanao gave a sultry smile and extended her tongue, beginning to lick Ethan's length.
"Mmm... chu... slurp... mm... haa... slurp..."
She started from the base and licked all the way to the tip, coating him in her slick saliva.
I'm licking Ethan-kun's thing...
The pungent scent of his masculinity and pheromones, combined with the sheer taboo of what she was doing, sent her excitement to impossible heights. Before she knew it, she had taken the whole length into her mouth.
"Mmmph... chu... haa... mmm! Slurp... haa... nng... chu..."
The sound of her wet, intoxicated sucking filled the room. Ethan's breath hitched as he fought to maintain control, his member swelling even larger in her mouth.
"......!"
Perhaps due to her natural talent, Ethan began to pant heavily, his body tensing as Nanao worked her tongue with instinctive skill.