Because Zhang Jingdong appeared to be arduously carrying them both up the mountain, but his hands weren't idle, always demanding "transport fees" on their bodies.
At first, Zhang Jingdong was quite polite to both of them, just gripping Xu Nuo's calf, and slightly sketching Qi Siyuan.
But later on, Zhang Jingdong started sketching Xu Nuo and pressing Qi Siyuan, and the closer to the mountain top, the more daring his hand positions became.
Xu Nuo didn't notice at first, until Zhang Jingdong began to sketch her calf, and then she finally reacted.
But she didn't struggle or stop him.
One reason is that being carried by Zhang Jingdong, she had no way to struggle or stop him.
Secondly, Zhang Jingdong showed her so much today: wealth, racing skills, photography skills, and even arranged advertising and movie production opportunities for her and Qi Siyuan.
And now he was even showing Infinite Strength carrying them both up the mountain.
