At the same time, the little elf transmitted a message to Shen Lang: "After Master and Sister Shuang'er cultivate together, your cultivation levels will advance by leaps and bounds. The power contained in the Nine Yin Profound Body of a Heavenly Rank expert is unimaginable."

"Hehe! Okay." Upon hearing this, Shen Lang gave Shuang'er a malicious look.

The little sprite flew to Yu Xian'er and flattered her, saying, "Congratulations, Sister Xian'er, on successfully embarking on the path of cultivation. From now on, you will no longer be restrained by the Nine Aperture Exquisite Sword Heart."

Yu Xian'er patted the little elf's head affectionately and said, "Thank you, little guy. I'll reward you with two new dresses!"

"Yay!" The little elf jumped up excitedly in the air upon hearing this: "Long live Sister Fairy!"

In the following period, Shen Lang provided the teaching materials, and Shuang'er served as the teacher.

Shen Lang and Yu Xian'er, a married couple, began practicing ancient martial arts in their secluded cultivation room.

Shen Lang was not satisfied with the simple path of cultivating immortality; he also wanted to try the ancient martial arts path pioneered by the Yanhuang people.

Fortunately, after his first conversation with Shen Lang, Yu Tianxing gave Shen Lang two ancient martial arts manuals: one was the ancient Bajiquan, and the other was the ancient Taijiquan.

Unlike the Bajiquan and Taijiquan that are popular among the common people, these two ancient books are genuine ancient martial arts manuals, and their quality has even reached the Heavenly Rank.

The reason it is called the Heavenly Rank is because the highest level in the current ancient martial arts system is the Heavenly Rank.

Yu Tianxing had told Shen Lang frankly that if one day the path of ancient martial arts could break through to the Heavenly Rank, these two manuals might gradually be upgraded.

For this reason, Shen Lang exchanged two Enlightenment Pills in the system, but after taking them, he did not feel anything special.

After asking the little elf, the explanation given was that his and Yu Xian'er's comprehension was already close to the maximum level, so the comprehension pills no longer had much effect on them.

After learning the truth, Shen Lang silently shed tears, heartbroken over his 60 trading coins.

It wasn't until dusk that the three of them emerged from their secluded chamber.

Back in her room, Shuang'er hadn't forgotten the vow Shen Lang had made to her earlier that day. She hurriedly opened her wardrobe and selected her favorite blue and white JK uniform, pairing it with white knee-high socks. Her stunningly beautiful face needed no further embellishment.

Shen Lang and Yu Xian'er returned to their room and were about to go to bed when Yu Xian'er kicked them out.

"My lord, Shuang'er is still waiting for you. Don't forget the teeth marks on your body!"

Shen Lang stood at Shuang'er's door and swallowed hard.

Then, she gently pushed open the door and walked in, pretending to be calm.

If Yu Xian'er is a classical beauty who can topple cities and kingdoms, then Shuang'er, after being carefully dressed up, is a captivating and alluring beauty.

At this moment, Shuang'er was by the bed, with her hair tied in pigtails, wearing a JK uniform that only covered her private parts, her long, straight, snow-white legs wrapped in a pair of milky white lace stockings, and her feet wearing a pair of shiny black leather shoes.

"Young Master." Upon seeing Shen Lang enter, Shuang'er's heart skipped a beat. She then quickly ran to Shen Lang and wrapped her snow-white arms around his neck.

Shen Lang pinched Shuang'er's already blushing cheeks and teased her in a flirtatious manner, "Little girl, do you really want your young master to favor you?"

Shuang'er nodded vigorously, pouting her sexy little lips, and said with a breath as sweet as orchids, "You've already favored Xiao Shiya and Xiao Bingyan, so it's my turn in line!"

Shen Lang stretched out his right hand and used the knuckle of his index finger to scratch Shuang'er's alluring nose. Then he picked Shuang'er up by the waist and threw her onto the princess bed.

Looking at Shuang'er lying on the bed with her brow bone exposed, Shen Lang could no longer resist and pounced on her.

"Little darling, prepare to die!"

"Young Master~"

At the moment the two merged, Shen Lang felt a powerful and pure force enter his body.

"Shuang'er, quickly circulate the Qi Refining Technique!" Shen Lang knew this was a gift from the Nine Yin Profound Body, and hurriedly reminded Shuang'er.

Shuang'er also sensed the abnormality in her body and quickly began to practice her cultivation technique as Shen Lang had instructed.

Afterwards, Shuang'er nestled against Shen Lang's chest and asked, "Young Master, what happened just now?"

Shen Lang patted her head and laughed, "That's feedback from your Nine Yin Profound Body. What level of Qi Refining are you at now?"

Shuang'er closed her eyes and sensed it for a moment, then opened them in shock and said, "Young Master, it seems I've reached the fifth level of Qi Refining!"

"And you, young master?"

Shen Lang said with a smile, "I'm a little stronger than you, I've reached the sixth level of Qi Refining."

"Ah!" Shuang'er exclaimed in surprise, asking incredulously, "Can this really improve one's cultivation level?"

"Yes, that's for sure. It's all thanks to the Nine Yin Profound Qi within you," Shen Lang replied with a smile. "Now you know why, right?"

Shuang'er nodded, then looked up at Shen Lang excitedly and said, "Young Master, in that case, let's continue!"

It wasn't until the sun was high in the sky that Yu Xian'er knocked on the door.

Shuang'er froze upon hearing Yu Xian'er's voice, as if she had just remembered something, and exclaimed, "Oh no! Miss is already up, and I haven't gone to serve her yet."

Shen Lang gently patted her back, reassuring her, "It's alright."

After casually putting on my clothes, I walked to the door and opened it.

Looking at Yu Xian'er standing outside the door, her face flushed, he said with a grin, "Wife, you're awake!"

Yu Xian'er said in shame and indignation, "Don't you two even look at the time? What time is it?"

"Hehe!" Shen Lang chuckled and scratched the back of his head.

Shuang'er quickly dressed, her face flushed, and she stammered with her head down, "Miss..."

Yu Xian'er said coquettishly, "Hurry up and wash up. Shi Ya has already prepared the meal and has been waiting for you for a long time. You are all adults and don't you know how to restrain yourself?"

"Mmm." Shuang'er nodded twice and then quickly ran away.

"Honey, look what this is!"

Yu Xian'er looked in the direction of the light and saw a wisp of spiritual energy visible to the naked eye wandering in Shen Lang's palm.

He exclaimed in surprise, "Ninth level Qi Refining cultivator releasing spiritual energy?"

Shen Lang nodded, then told Yu Xian'er that Shuang'er possessed the Nine Yin Profound Body, explaining why the two had stayed up all night.

"That can't be done." Yu Xian'er rolled her beautiful eyes at Shen Lang: "What about Shuang'er? Has she broken through too?"

Shen Lang nodded: "Same as me, level nine of Qi Refining! Hehe."

"You guys!" Yu Xian'er sighed softly, then grabbed Shen Lang's arm: "Come with me to wash up, the food will get cold soon."

Although Yu Xian'er wanted to reprimand them, one was her beloved, and the other was her maidservant whom she had doted on since childhood, who was more like a sister than a sister.

They didn't say anything more.