```
"Sixty-nine?" Xu Wendong asked, puzzled, "Isn't sixty-nine fifty-four?"
Lin Yiren blushed and avoided Xu Wendong's eyes, murmuring like a mosquito, "The sixty-nine I'm talking about isn't multiplication; it's a position. Don't you know?"
Boom!
Xu Wendong felt as if a bomb had exploded in his mind, flashbacks of scenes from old films filled his mind. He awkwardly replied, "I know a little, but not how to do it..."
"I can teach you!" Lin Yiren said, her face full of bashful charm, then slowly moved around in the dim room until she found a suitable position.
At that moment, Xu Wendong felt an unusual excitement because he could clearly see Lin Yiren's soft, pink shape.
At first, both of them used their hands, but as time went by, Lin Yiren surprisingly started using her mouth.
This made Xu Wendong's eyes redden, and even his breathing became more rapid.
He hadn't expected Lin Yiren would use her mouth to help him.
