After a fit of teasing laughter, Li Yundong finally managed to suppress his smile and helped the young girl sit up. He said, "Alright, alright, no more fooling around. Tell me, what do you need me to do?"

Su Chan huffed, like a triumphant general returning from victory, and declared smugly, "Even the great True Person Li had to beg for mercy from me?"

Li Yundong chuckled, "Yes, yes, Divine Fox Immortal, quickly give your orders, and this humble servant will certainly comply!"

Su Chan giggled and said, "Just close your eyes!"

Li Yundong curiously and confusedly closed his eyes. After a short while, he felt waves of cool, faint energy slip in through his lips. This influx of Yin energy immediately stirred the Yang energy within him. Li Yundong felt that if he didn't exert control, this Yang energy would automatically follow the Yin energy and flow outward continuously.

This lasted for perhaps less than a minute when Su Chan suddenly laughed, "All done!"

When Li Yundong opened his eyes, he saw Su Chan radiant, her skin so tender it seemed ready to burst at the slightest touch, her complexion almost glowing. Li Yundong exclaimed in surprise, "Wow, did you eat a Ginseng Fruit? Are you experiencing rejuvenation?"

Su Chan playfully shot him a look and retorted, "Hmph, you're old! I only absorbed a tiny bit of your Yang energy. Is the change noticeable?"

Li Yundong scrutinized Su Chan up and down, clicking his tongue in amazement. "Impressive, the change is indeed very obvious. You could be a spokesperson for cosmetics! Whoever gets you as an endorser, wow, that product would absolutely blow up!"

Su Chan blinked her eyes, "Really? Can I earn a lot of money?"

Seeing that she was genuinely considering it, Li Yundong quickly said, "No, no! You're my girl, how could I let you step into the entertainment industry? The waters there are too murky. How could I bear to let you wade through it? No, no, absolutely not."

Su Chan had only said it in passing. Seeing Li Yundong strongly object, she didn't press the issue. She smiled, "Fine then, I'll listen to my Master!"

Li Yundong playfully reached out to pinch Su Chan's cheek. The moment his hand touched her, he theatrically snatched it back, exclaiming with exaggerated drama, "Whoa, such amazing elasticity!"

Li Yundong's antics made Su Chan burst into peals of laughter, "Stop it! Is it really that exaggerated?"

Li Yundong laughed, "The change is quite significant, but I feel like the Yang energy you took wasn't that much. Why is the transformation so rapid?"

Su Chan sighed softly and said, "That's the power of us demon cultivators, Yundong. Do you know what dual cultivation is?"

Li Yundong thought back to the ancient texts he had perused. He replied, "I initially thought it was a Qi refinement technique performed during sexual intimacy between a man and a woman. But later I learned that dual cultivation can also mean cultivating both life essence and spirit simultaneously—a dual cultivation of body and mind. There is also Buddhist-Daoist dual cultivation, practicing both Buddhist and Daoist techniques concurrently. It doesn't just refer to intimacy between genders."

When it came to cultivation matters, Su Chan shed her usual playful demeanor. She said softly, "You are correct, but in reality, dual cultivation is an extremely complex and dangerous endeavor. When a man and a woman are in the throes of ecstatic pleasure, they often lose all restraint, finding it impossible to calm their minds and control their breath. If one loses control of their breath, their essential gate will become insecure, causing the weaker party's essence to flow to the stronger, resulting in one party being greatly depleted while the other is greatly nourished."

Li Yundong nodded in agreement, "You speak the truth. I recall Ziyuan once saying that cultivation is highly scientific; it cannot create energy from nothing. Even cultivation must adhere to the law of conservation of energy. When two people cultivate together, it is almost impossible for both of their powers to increase upon completion. The principle is the same as playing Mahjong; whether two or four people play, it's impossible for two or four sides to simultaneously win money. There must be a loser to balance the winner."

Su Chan looked at Li Yundong, admiration and envy mingling in her gaze, "Oh, Yundong, you are so clever, able to extrapolate so much from so little. What you said is absolutely correct. Many Daoists who advocate for dual cultivation are actually practicing methods of extraction and absorption. In their eyes, women are merely medicinal ingredients or cauldrons, so they never care about their fate. However, this method yields results incredibly quickly. Especially after our Fox Charm Sect's first Patriarch passed away and the second took the mantle, our sect's pillar was gone, and our influence severely waned, surrounded by enemies. Thus, the second Patriarch sought to rapidly increase her own strength. She heard that the Yin-Yang Sect on Mount Wuhua possessed a dual cultivation technique for rapid advancement, so she infiltrated Mount Wuhua disguised as a female disciple and secretly learned the technique."

Su Chan paused here and sighed mournfully, "The second Patriarch treasured this technique like a jewel and immediately passed it on to her disciples. As a result, nearly everyone in the Fox Charm Sect began dual cultivating, seeking out young men with pure Yang essence in the mortal world to harvest their Yang to supplement their Yin. In the end, they turned the human world into a miasma of corruption, leading many cultivators to believe we were inherently lecherous fiends."

Li Yundong asked curiously, "But I haven't been interacting with you for a short time. Whether it's your Master, Ao Wushuang, or Cao Yi, I’ve seen that although they possess alluring faces and graceful figures, their conduct is quite dignified and restrained, devoid of any licentious behavior."

Su Chan replied, "That's because after the second and third Patriarchs, the fourth, Tianji Xuanhu, took over as the leader of the Fox Charm Sect. By then, our sect was notorious, like rats fleeing the streets, hunted and persecuted by cultivators. Most terrifyingly, the cultivators of the Fox Charm Sect discovered that the inner elixirs they obtained through harvesting Yang were almost instantly shattered when confronted by the inner elixirs of orthodox Xuanmen cultivators!"

"At this time, Tianji Xuanhu summarized the lessons learned from the previous two leaders. She believed that while the path of dual cultivation offered quick success, it lacked tempering and refinement—it was a shortcut, not a worthy primary path. Therefore, she discarded the dual cultivation technique, transformed into an ordinary female disciple, and infiltrated the Daoist lineage to secretly learn orthodox Xuanmen techniques. However, the powers gained from dual cultivation were too easy to master, and abandoning them entirely was difficult. Tianji Xuanhu modified it."

"The modification changed the process from physical intimacy between male and female to the exchange of subtle energies between them. Thus, dual cultivation was subsequently divided into Great Dual Cultivation and Minor Dual Cultivation." Su Chan spoke fluently, summarizing the origins of Great and Minor Dual Cultivation in a few strokes. She continued, "With this alteration, the disciples of the Fox Charm Sect no longer had to risk universal condemnation by engaging in acts that harmed the celestial harmony by harvesting Yang to supplement Yin. Yundong, as you know, prolonged Great Dual Cultivation, involving the harvesting of Yang, can literally drain a person into a desiccated corpse. As the saying goes, desire is a bone-scraping knife; that is the very principle."

Li Yundong chuckled, "I understand. This principle is actually similar to my cultivation of the Eight Revolutions Fire Nurturing Art. My Eight Revolutions Fire Nurturing also combines the internal Heart Fire Qi with Kidney Water Qi, merging the Yang energy of the right kidney with the Yin energy of the left kidney. Through this, I refined Supreme Yin energy from pure Yang energy, causing my cultivation to leap from the Yin Spirit stage directly to the Yang Spirit stage."

"Your demon cultivation dual practice also combines Yin and Yang energies to catalyze and mature the inner elixir within your body, is that right?" Li Yundong asked with a smile.

Su Chan nodded, smiling, "Exactly. Tianji Xuanhu changed Great Dual Cultivation into Minor Dual Cultivation. Although the effects aren't as pronounced, it is much safer. At least neither the man nor the woman has to fear being completely drained by the other; they can control their own vital breath."

Li Yundong wrapped his arms around Su Chan and smiled, "Then shall we practice Minor Dual Cultivation every day from now on?"

Su Chan immediately waved her hands, protesting in alarm, "No, no, absolutely not!"

Li Yundong asked in surprise, "Why not? Look how much change just a tiny sip of my Yang energy caused in you. If you absorbed a little more, you'd ascend directly to immortality!"

Su Chan shook her head like a rattle drum, saying, "No, no. As the saying goes, dripping water pierces stone, and sawing rope breaks wood. Today I absorbed a little bit of yours, but this is your purest Original Yang True Essence. This is the most refined, the most essential substance within you, and it is extremely difficult to cultivate. If I take a bit, you lose a bit. As the Dao of Heaven dictates, it diminishes the abundant and replenishes the deficient. It takes a man only a few seconds to release his true essence, but replenishing it requires several days. By the same logic, the speed at which you deplete your true essence is certainly faster than the speed at which you replenish it. Over time, your cultivation will regress significantly!"

Li Yundong waved his hand dismissively with a smile, "What does that matter? As long as my little sweetheart grows stronger, isn't that enough?"

Su Chan looked moved, embracing Li Yundong, and said softly, "My Master, I appreciate your kindness, truly. But you cannot spoil me like this; it's not good. Think about it: if the cultivation I achieve comes too easily, I won't put in the hard work. An inner elixir cultivated without arduous effort is a false elixir—it will shatter instantly when encountering a true master. Even if I cultivate an immensely powerful inner elixir through Minor Dual Cultivation, it will still be useless against an expert."

This statement deeply resonated with Li Yundong. He sighed, "You speak well. I recall after I succeeded in Foundation Establishment in the Himalayas, I encountered Wu Hao. His inner elixir was formed through Yin-Yang dual cultivation. Yet, a mere gust of my true breath caused his Five Yang Blood Radiance Pearl to reverse its course, while his breath couldn't even move the pearl an inch. Why such a vast difference when both used a breath? It's because my inner elixir was forged through a thousand refinements, while his was obtained through male-female dual cultivation. It’s like the difference between a battle-hardened veteran soldier and a pampered garrison soldier living in comfort. Though both are soldiers and both can fire a gun, when it comes to a bayonet charge, the difference between them is immense."

As Li Yundong spoke, he lowered his head, gazing at Su Chan with deep admiration and affection, gently stroking her hair, "Good girl, my little sweetheart is truly sensible, truly understanding the need for self-improvement. Well done!"

Receiving this praise from Li Yundong made Su Chan feel sweeter than if she had eaten honey. She nodded with a delighted smile, "Mhm, I will work hard. When my true essence is strong and robust, I'll ask you to teach me the Nine Revolutions Golden Elixir Art!"

Li Yundong laughed heartily, "That sounds good."

But in his heart, he thought, Cultivation depends on gradual accumulation. By the time Su Chan's True Essence inner foundation is solid, it will be far too late. No, I must think of another way... It’s a pity I already consumed the Mortal Essence Golden Elixir, and the location of other Mortal Essence Golden Elixirs remains unknown. However, the Medicine King Cauldron that Ziyuan mentioned is indeed a marvelous treasure... but I don't know where it is, nor do I know how to refine elixirs...

Li Yundong pondered for a while but found no immediate solution, so he temporarily pushed the thought aside, marking it down in his memory.

When dawn broke the next day, Zhou Qin knocked on Li Yundong’s door early. Li Yundong opened it to see Zhou Qin dressed in a student uniform, with Ruan Hongling standing beside her, also in a student uniform. He asked, "What are you two dressed up for?"

Ruan Hongling let out a small laugh and said to Zhou Qin, "I told you this guy would definitely forget his other identity, right?"

Zhou Qin smiled wryly, "Master, you haven't forgotten, have you? You still have to go to school! You’ve missed classes for many days, as have I. If we don't go back now, our enrollment will be canceled!"

Li Yundong slapped his forehead and laughed, "I wouldn't have remembered if you hadn't mentioned it. Wait for me a moment, I’ll be right out."

After washing up, as Li Yundong was about to leave with Zhou Qin and Ruan Hongling, Su Chan spotted them and bounced over, laughing merrily, "You're going to school? I want to go too!"

Upon her suggestion, the other little foxes chimed in with excitement, "Sect Master, we want to go too!"

Li Yundong looked at the growing crowd and felt a massive headache forming. He thought: Last time you almost overturned the entire school, and now you want to go again? This is going to be a disaster! Do they think I’m taking them on a spring outing? C