Volume 1 Chapter 20 *
Edited by: Kanaa-senpai
One day later, I found myself back in Mana’s room.
To do that… we needed to prepare. That’s why Mana had told me to wait a day.
”Well then… please, Kanade-kun. Just like we promised… give me the ‘first time’ of your second (Tenketsu)¹.”
”…Yeah,” I replied. “My first time using a (Tenketsu) on someone’s… on a girl’s butt… I’m dedicating it to you, Mana.”
After that brief exchange, a visibly nervous Mana climbed onto the bed. There, she smoothly slid off her sweatpants. Naturally, my eyes were immediately drawn to the pure white fabric hugging her well-shaped rear.
A surge of overwhelming excitement hit me. I almost wanted to squeeze my eyes shut, but… I was about to see things far more intense than this. If I chickened out now, there was no way I’d be able to go any further.
”Is this direction okay? Like… like this?” she asked.
Mana lay face-down on the bed and arched her back, thrusting her backside up into the air. It was a position that looked exactly like she was waiting to be taken from behind.
Right in the center of those protruding cheeks, through the white cloth… was that a faint vertical line I could see? W-Was that… Mana’s… p**sy…?
”…Gulp… Y-Yeah… that looks right. This way… it’ll be a little easier to work, I think…”
If she had been lying on her back, I would have had to look her in the eye while stimulating that spot. There was no way a guy whose age equaled his years of virginity could handle that level of stimulation.
”I’ll put a pillow under your stomach, okay?”
”Yes… thank you, Kanade-kun…” she replied.
It must have been exhausting to keep her hips hiked up like that, so I stuffed a pillow into the gap under her belly to support her weight.
I took several deep breaths, staring at the pristine white underwear covering her pristine white skin. Then, I slowly lowered my palm toward Mana’s rear.
”…Ah…♡”
The moment she let out that soft sound, I felt it—the supreme sensation of her skin. It was moist, sticking slightly to my palm as I sank into her pillowy softness.
Part of me wanted to just stay like that, stroking and kneading those innocent cheeks, but that wasn’t why I was here. I couldn’t betray the trust Mana had placed in me.
”I’m… I’m going to pull them down now…”
”……Yes…♡” she replied.
I hooked my fingers into the soft, thin fabric. As I slowly tugged, the underwear slid down much more easily than I’d expected. The soft, white curves of her buttocks were revealed inch by inch… the alluring start of her butt crack peeked out…
And then, as I slid the panties further down… Mana’s neat, tightly-puckered anus was fully displayed.
If I kept pushing them down, I’d be able to see her p**sy, too… but I absolutely couldn’t break her trust. I slammed a lid on my desperate urge to see her front and focused entirely on the cute, innocent-looking hole that had just emerged.
”…Ah… th-this is… gulp…”
It was a simple, unassuming hole. No discoloration, just faint, delicate wrinkles. Yet, I couldn’t look away.
Until now, I’d told myself that the anus wasn’t an “erotic” place—that it was just a functional hole for waste, and stimulating it would be nothing special. I was dead wrong. Mana’s anus—her anal—was so incredibly erotic I wanted to lose myself in it.
”O-Okay, I’m starting!”
If I waited any longer, I really was going to pounce on her. I hurriedly began the task at hand: the (Tenketsu) on Mana’s anus.
”……Yes…♡” she replied.
As she spoke, her neat hole twitched and contracted. It was trembling as if it were begging me to touch it. I slowly extended my right index finger toward her.
”……Hyan!♡ Kanade-kun’s… finger is… really on my… butt…♡”
The moment my finger made contact, Mana let out a voice that was dangerously sweet. I tried my best to ignore it and focused on the sensation. It was hard to tell if it felt more like skin or a mucous membrane.
As I lightly moved my fingertip over her hole, the very center felt slightly damp.
Mana let out strangely sweet moans. I fought to keep my focus. I had to remember—I wasn’t here to play with her; I was here to perform a (Tenketsu).
Squish, press, push…
”Nn…♡ Nfu…♡ Nku…♡”
I increased the pressure, recalling how it felt when I’d used the skill on myself. The sounds Mana was making grew more intense. I didn’t know if it was ticklish or painful for her, but she’d just have to bear with it. Besides, this level of pressure wasn’t enough to trigger the skill yet.
Push, grind, deeper…
”Nnn…♡ Nhiaa!♡ Nfaa…♡”
Mana’s panting was getting heavy now. Her skin was starting to get a light sheen of sweat, and her anus felt increasingly moist under my touch.
But even with this much stimulation, the (Tenketsu) wouldn’t trigger. When I’d done it to myself, this much should have worked. I guess the requirements vary from person to person.
I had a feeling that for Mana, I’d need to get a little deeper and really grind into it.
”Mana… it looks like I need to stimulate a bit deeper inside…”
”In… inside…?♡” she asked. “I-if you do that… I’ll… with my butt…♡ But I understand. Go ahead, Kanade-kun…♡”
”Right. Here I go, Mana…♡”
To get past her tightly closed entrance, I needed a bit more lubrication. I coated my fingertip with my own saliva and pressed it against her again.
Squelch.
My finger was swallowed into her narrow depths.
”Whoa… it’s so hot inside… and the tightening is incredible…”
Her internal muscles were pulsing and squeezing against my finger. I couldn’t help but wonder how amazing this would feel if it were my c**k instead of just a finger.
The deeper my finger went, the more intense the sensations became for her.
”Ah… ahh!♡ It’s so… wet…♡ Kanade-kun’s finger is… all the way inside!♡ Ah… ahh!♡ This… Kanade-kun, this is amazing!♡”
Her voice rose to a fever pitch. I just needed her to hold on a little longer. If I ground my finger in at this depth, it would surely trigger.
Grind…
”Nfu!♡”
Grind, swirl…
”Nfa!♡ Nfuuu!♡”
Grind, grind, swirl…
”Nhia!♡ Nfu!♡ Nnn-fuu!♡”
Grind-grind-grind-grind!
”Nn!♡ Nfu!♡ Nfui!♡ Nfaa!♡ Ah… nnnnnnnnn-fuaaaaaaaa!♡♡”
After a few moments of vigorous stimulation, I felt the Dungeon Energy suddenly drain from my body. Mana let out a wild, uninhibited cry as her entire body buckled and convulsed. At the same moment, her anus clamped down hard on my finger, squeezing with everything she had.
And just like that… I had successfully activated the (Tenketsu) on Mana’s anus.
—
Summary:
Following a day of preparation, Kanade visits Mana’s room to perform a specialized (Tenketsu) treatment on her buttocks. He struggles with his intense arousal and virgin anxiety as Mana assumes a provocative prone position. After carefully removing her underwear and observing her anatomy, he begins manual stimulation of her anus. Finding that light pressure is insufficient, he uses lubrication and deeper penetration to reach the necessary threshold. The treatment culminates in a surge of Dungeon Energy and a powerful physical reaction from Mana. Kanade successfully triggers the skill, marking a significant milestone in their intimate and magical collaboration.
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Trivia:
- The mention of ‘Dungeon Energy’ draining from Kanade suggests a mana-cost for his skill activation, implying limits to his abilities.
- The protagonist’s internal conflict regarding ‘betraying trust’ highlights his high moral fiber even in highly erotic situations.
- Mana’s willingness to allow ‘internal’ stimulation suggests a deep, growing level of submission and trust in Kanade’s expertise
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Character Insight:
The relationship shifts from simple cooperation to deep physical intimacy. Mana demonstrates absolute vulnerability by allowing Kanade to explore her most private areas, while Kanade’s devotion to his ‘cheat skill’ helps him overcome his social anxiety.
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Lore And Worldbuilding Context:
The activation conditions for (Tenketsu) vary between individuals, requiring different depths and intensities of stimulation to trigger the flow of energy.
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TL Notes:
The term ‘Tenketsu’ is left transliterated to maintain the martial arts/wuxia-style flavor of the skill names often found in Japanese ‘Cheat’ fiction.
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Glossary:
Notes:
• Mana – Class President, a serious, refined beauty with long black ponytail, glasses, and a neat, lovely appearance, wields the [Sage] job with mature observance and elite close-quarters combat skill. Though once dating soccer ace Kosaka—now depressed and feeling worthless—she’s deeply supportive of Kanade as his strategic confidante and partner, displaying bold, inquisitive curiosity during intimate moments, including requesting a (Tenketsu) treatment while wearing indoor sweatpants and pure white underwear. Her disciplined, almost clinical demeanor masks a sadistic competitive edge, honed through martial arts, yet her loyalty and emotional depth reveal a complex soul beneath the polished exterior.
• Kanade – Small-statured dungeon academy student and protagonist with the Unique Job [Vital Point Practitioner] (Tenketsu), specializing in pressure-point manipulation for defense and physical augmentation. Analytical and observant, he studies dungeon mechanics and combat styles while struggling with self-doubt over his failure to reach Phase One. Deeply infatuated with Mana, he navigates an intimate, erotic relationship with her—easily flustered by her boldness, yet fiercely protective of her trust—despite his virginity and a mysterious cheat skill that eliminates his refractory period. He feels competitive with Kosaka, cynically dismisses government-mandated classes, and quietly admires the Class President, though he questions his leadership. His embarrassing yet effective new application of Tenketsu has begun to shift his standing—both in battle and in Mana’s eyes.
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Edited by Kanaa-senpai.
Thanks for reading.
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