common perpendicular

Tang Tan couldn't help shaking his head, so Xia Qu aimed the test tube clip at Tang Tan's little cherry and clipped it on.

Tang Tan trembled, it was no more painful than Zhishui pinching, but when the body twisted, the rough wood would rub against the delicate nipples, making it even more tingling and unbearable.

Moreover, the test tube clamp is much heavier than the water-stop clamp, hanging on the chest, it will pull the nipple with the movement of the body.

Tang Qin hissed through the tie, his chest rose and fell rapidly.

"Here, you should know that this is an ordinary test tube, and the other is a special test tube. Let's talk about it next time."

While talking, Xia Qu lowered Tang Qin's chair, then lifted his legs and put him on the laboratory table.

This posture was a huge test for Tang Qin. His legs were hanging in the air, his arms were tied to the back of the chair, and all his weight was pressed on Xia Qu's thighs through his knees.

After tying Tang Tan's feet together, Xia Qu ignored his twisting and took off Tang Tan's pants little by little.

"Test tubes are the most basic chemical laboratory supplies, and they are reaction vessels for small amounts of reagents."

There is a green light in his eyes like a ferocious wolf before predating, but he is still explaining the important knowledge points in a serious manner.

This kind of Xia Qu completely suppressed Tang Qin's desire to resist mentally, and pinched his weakest part.

Watching Xia Qu take out the lubricant and drop it into the test tube with a rubber-tipped dropper.

"When heating the liquid, the volume of the liquid should not exceed one-third of it. When dripping, the dropper should be suspended in the air, and it should not touch the wall of the test tube, which will contaminate the reagent."

Putting his hand in front of Tang Qin to demonstrate, he skillfully dripped a third of the amount and then stopped.

The test tubes are then placed on the test tube rack.

Xia Qu's hands that had just touched the glassware were slightly cold, and he decisively peeled off Tang Tan's somewhat faded underwear.

The corners of Tang Tan's eyes were red, and his nipples were clamped for a long time, and they trembled from time to time...

The pleasure has already begun to move vaguely under the skin, ready to attack the brain completely.

When he thought that Xia Qu was going to play with the cock again, he saw Xia Qu's hand go straight down and suddenly grabbed his buttocks.

"Very soft..."

Tang Tan was stunned when the three correct words came to his ears, and a flash of inspiration flashed in his mind.

Then suddenly twisted and trembled on Xia Qu's thigh like a water snake, trying to get rid of the hand biting his ass.

He realized what was going to happen.

Xia Qu ignored him at all, withdrew his hand, tilted the test tube, used the test tube to pour lubricant on his hand, and smeared the entire index finger.

Under the bright white light, the finger reflected the oily light, which looked very scary—this was the case for Tang Tan now.

"Well……"

When he felt Xia Qu move his fingers as if he was looking for something, Tang Qin tensed all the muscles in his body.

As if feeling it, Xia Qu used the other hand to comfort Tang Tan's chest, causing Tang Tan to sob.

Being distracted, the clenched buttocks gradually loosened.

At a certain moment, Xia Qu's index finger touched the place he was looking for, and his face showed joy.

When Tang Tan let out a breath, he stabbed hard.

In an instant, the overwhelming heat tightly wrapped the index finger, and the ten fingers connected to the heart, burning all the way to the heart.

Xia Qu's heart was full of mixed feelings.

Inexplicable feelings are mixed together, including the sadness of being betrayed, the anger of jealousy, the sweetness of liking, and the spiritual refreshment...

Without too much hesitation, the fingers moved forward in the tunnel like this.