Looking at the superb body in front of him, Zhang Zheng and Zhang Daguan's breathing suddenly became short.

At this time, Zhu Yuanyuan's face was already crimson, her eyes were as drunk as silk, her moist lips were red, and she felt Brother Zhang's fiery gaze, this burning gaze, which made her obsessed and intoxicated.

"Sister Yuanyuan, you are so beautiful!"

"Brother Zhang, do you like it?"

"Love it so much! Loved it! ”

"As long as the brother likes it, the sister will always belong to the brother."

"Sister, from today on, you are my woman, and my brother will love you for the rest of your life." Zhang Zheng said solemnly.

"Since you like your sister, why are you still bothering? It's almost time for my sister! ”

At this time, the words of the best beauty were the lights out signal for stripping and going to bed in the barracks, and Zhang Daguan immediately began to act like a soldier.

I saw him wave his big hand a few times, and his clothes left his body, and when he landed, Zhang Daguan's sturdy and toned physique was presented in front of Yuanyuan.

"Mom!"

"Sister Yuanyuan, do you like it?"

"Hmmm! My sister loves it so much! ”

"Brother, you are a doctor, can you give my sister a science popularization, how can such a * guy enter a woman's body?" Zhu Yuanyuan asked curiously.

"In fact, in Western society, few people ask such questions." Zhang Zheng said.

"Why?"

"Because in Western society, these physiological common sense or knowledge has been popularized since primary and secondary schools, and our country is very backward in the popularization of knowledge due to the influence of traditional moral concepts. Zhang Zheng said.

"Brother Zhang is right, I am extremely lacking in this knowledge, such as the problem I just mentioned." Zhu Yuanyuan said.

Actually, this question is not difficult to grasp. Because the female channel will become larger with the increase of **, the channel wall is like a pleated skirt, when the *** is aroused, these pleats will open, so that the diameter of the channel reaches 5 or even 7 cm, so that objects with a certain diameter and thickness can enter and exit freely. Zhang Zheng explained.

"That means that the women's aisle automatically adjusts its size to ensure the most comfortable enjoyment for you?" Zhu Yuanyuan asked.

"My sister is right, not only can it increase the diameter, but it will also automatically extend the length of the channel to accommodate objects with long scales. Usually the diameter of the passage for women will not exceed 2.6 cm, but when giving birth, it will automatically expand to about 11 cm to 13 cm, ensuring that the baby's head can pass through, which is why such a large baby can be delivered through the life channel. Zhang Zheng further explained.

"Ahh Can you scale to such a big scale? It's horrible. After expanding to such a large size, can it still recover? Zhu Yuanyuan asked worriedly.

"Sister don't panic, after about six weeks of childbirth, the passage will (or almost) return to its pre-pregnancy size." Zhang Zheng said.

"Oh, then I'm relieved, in that case, when are you waiting, brother, come up quickly!"

At this time, the words of the best beauty are the charge of the charge, and Zhang Daguan began to act like a brave warrior.