Certainly, I'd be happy to help you improve the grammar and language in your novel. Here's a revised version of your text:
The incredibly fragrant and sweet aroma filled the air, carrying a subtle hint of sweetness. This delightful sensation caused Lu Yunxiao's starry eyes to widen, filling them with astonishment.
Yun Yun's eyes mirrored his surprise as they locked onto each other's gaze. They stood there, frozen in the moment.
Although Lu Yunxiao's eyes were dazed, his hands instinctively found their way to Yun Yun's waist, pulling her gently closer. He tilted his head slightly and pressed his lips against Yun Yun's rosy ones.
He had harbored affection for Yun Yun for some time, and in this intense moment, he could no longer suppress his innermost emotions.
Everything they did was entirely unconscious, stemming from the deepest corners of their hearts.
Yun Yun, however, remained stunned, unable to comprehend the situation as Lu Yunxiao took the lead.
As Lu Yunxiao kissed her, Gu Xun'er was left utterly bewildered, his thoughts in disarray as he surrendered to Lu Yunxiao's advances.
Yun Yun was similarly lost, engulfed in Lu Yunxiao's intoxicating warmth and breath. Her heart raced, and beneath that kiss, she found herself unable to control her emotions any longer.
Instinctively, she followed the desires of her heart, reciprocating Lu Yunxiao's affection.
They embraced each other passionately, sharing warm, lingering kisses deep within the cave.
...
"Yunzhi!"
Seeing Yun Yun seated on the stone platform, her back turned to him, Lu Yunxiao couldn't help but whisper.
He had not anticipated this sudden kiss, but Yun Yun's eager response had filled him with joy.
"Yunxiao, let's consider this incident a one-time accident," Yun Yun whispered, her voice calm but tinged with a hint of coldness.
She felt ashamed and infuriated by her own actions during that moment. How had she allowed herself to take the initiative like that? It had even seemed as if she had enjoyed it.
Now, she was back to her senses, and she wished to dismiss the matter lightly.
"What do you mean by that?" Lu Yunxiao frowned. Was she intending to sweep this under the rug so easily?
"That's exactly what I mean. We'll act as though it never happened," Yun Yun's voice remained crisp and cold despite her inner turmoil.
"Act as though it never happened?" Lu Yunxiao raised an eyebrow, his tone tinged with sarcasm. "I'm sorry, but I can't do that. And can you truly pretend it never happened?"
Yun Yun's body trembled slightly upon hearing this, and memories of that kiss and the unique sensations it had stirred surged to the forefront of her mind.
Could she really forget? Could she truly act as if it had never occurred?
She closed her eyes, and all she could picture was Lu Yunxiao's handsome face. Though she refused to admit it, she had developed feelings for him.
She was unwilling to accept it so easily, that she had fallen for someone so much younger.
"It seems that you're just as conflicted as I am, telling me to forget when you can't forget either," Lu Yunxiao sighed. He took a step closer, wrapping his arms around Yun Yun from behind.
"Yunxiao, what are you doing..." Yun Yun began to protest, but her movements froze at Lu Yunxiao's commanding tone.
"You're a stubborn woman," Lu Yunxiao chided gently. "I don't know what's holding you back, but time will reveal everything. One day, you'll willingly accept me."
Lu Yunxiao's words were filled with confidence.
After that kiss, Yun Yun could never forget the feeling. The longer they were apart, the more she longed for him.
She found herself in a situation similar to Gu Xun'er's in the past, captivated by Lu Yunxiao.
This woman, no matter how stubborn she was, would eventually belong to him.
Lu Yunxiao lowered his head and placed a gentle kiss on Yun Yun's cheek.
Yun Yun's body stiffened, her eyes filled with a mix of shock and anger. How dare he kiss her again?
She thought indignantly, Did he think he could embrace her and kiss her at will?
"Lu Yunxiao!" Yun Yun exclaimed, turning to face him with a look of fury. She grabbed his arm, opened her mouth slightly, and bit down.
When a rabbit is cornered, it bites, and Yun Yun was no different.
Lu Yunxiao winced in pain but refrained from using any protective measures. "Ouch! Yunzhi, please stop."
Yun Yun sneered, biting him once more.
Lu Yunxiao couldn't believe how merciless she was being. This woman, did she have no restraint?
However, he found himself liking her even more than before. She was more genuine now, without the pretense of arrogance and indifference.
After all, to win over a fairy, one must first bring her down to earth.
Today's Yun Yun had a hint of worldly allure, something the previous Yun Yun had never displayed.
"Yunzhi," Lu Yunxiao endured the pain and gently ran his hand through her silky hair. It was soft and exquisite, and the sensation was too pleasing to let go of.
As he stroked her hair, Yun Yun trembled slightly. The memory of the warmth from Lu Yunxiao's body flooded her mind, and a complex mixture of emotions swirled in her beautiful eyes.
"What a troublesome man," she sighed internally, feeling cornered.
Seizing an opportunity, Lu Yunxiao released himself from her grip, and his left hand found its way to her back, embracing her from behind.
"Yunzhi, I really like you," Lu Yunxiao whispered dreamily. His right hand slid down her long hair, gently patting her back.
Yun Yun leaned into his embrace, her voice barely audible as she made her final excuse. "But, Yunxiao, you're still so young, and I'm more than ten years older than you."
"In fact, I could introduce you to a beautiful woman more suitable for your age."
In an attempt to extricate herself, Yun Yun brought up her talented apprentice.