"You can go now, Beau. We are finishing work for today. Put the chains on their pussies again and let them here for the night."
She watched as the mulatto girl obeyed her.
"Good girls," she said as she caressed one of the fillies. "You have given your cream for the first time; there will be others, because this thing is very important to us humans. Tomorrow we will put reins on you and teach you to walk with a person on you. Aren't you happy?"
"Yes, mistress," said one of the fillies. Linda looked at her badge: she was Ginga, a filly from Kumbo, as the earring indicated. Her mother was Tonga, to whom she resembled very much. Linda touched the belt lock over her pants and sighed. Still some days to go...
"Mistress, are we going to pull carts too?" Ginga's girlish voice asked. She had come near Linda and the chain from her pussy was fully stretched. She groaned as she felt the tug, and went a step back.
"Yes, certainly, this is what black centauresses do, and also other things, as you have seen," said Linda.
"But why have we to stay with this thing on us?"
"Because Master said so," was the reply. "You belong to him, never forget that."
She slapped gently Ginga's rump and watched as the girl shivered. Then she locked the stall and took a long glance at Beau's slender body, as she walked gracefully away towards her room. Linda would give a month's salary to go after her and have her lick her soles again; but that would have to wait. She was belted like a medieval woman; still surprised, she asked herself why she had agreed to such a thing. As she could not figure that out, she shook her head and went up to the lab, where she put the flasks in the fridge together with the one from Beau.
It was darkening; another day had passed in the Centaur Ranch. Dinner should be ready; Linda went to the house in a brisk pace, feeling the contact of the cold metal on her pussy and wondering how good it would be when Sean released her.
21. Linda restrained
The next morning, James and Linda sat by the computer as it processed the slides made from the cream samples they had collected from the centauresses and from Beau. A special program had been installed, and the screen showed a pattern of lines in a sort of graph. James superposed the images and said:
"You see, Linda, it is intriguing... Look here, the curves from the girl match for some inches those from the females. This means that some parts of the DNA chain are the same."
"James, I am still puzzled how it is easy to control these beasts. With simple commands, we are able to make them perform almost duty. And now Beau started to call us whites "master.".. Any idea of why?"
"I think that these centaurs have sprung from some still unknown mutation. You know that there was runaway Negro slaves in this area. They may have got some mares to relieve themselves. Usually this would give nothing, but it seems that here we had a most unlikely result: the DNA's mingled and the offspring was fertile. I am not sure, but this is at least a working hypothesis."
Linda was standing; she put her head to the microscope and took some notes. James could not help feeling his cock bulge as he watched the gracious curve of her ass; Sean had told him about the belt, and he was eager to see it. The girl felt his gaze on her and turned her head; her face was red with shame.
"Linda? Are you well?"
"Yes, why?"
"May I ask what is this under your pants?"
Linda gasped. "It is... er... ah... Sean suggested an experiment..."
James feigned not to be aware.
"An experiment?"
"Yes... he said that we are to study female sexual responses..."
"I see... and...?"
"And..." She took a deep breath. "And I am wearing a ...a ..."
"A what, Linda?" James was savoring her embarrassment.
"A chastity belt," she said and buried her face in her hands.
"Oh, but this is quite natural... I understand that you have to be restrained, so that you don't yield to any temptations, and then be examined, is that correct?" Linda nodded.
"Linda, would you allow me to see it?"
The girl's eyes opened wide, showing her astonishment at that request. James waited calmly as she made up her mind.
"Well... I don't think it would do any harm," she said. James smiled as she lowered her pants. The belt was shining on her pussy, a lock well visible on the triangular buckle. James sniffed between her legs:
"You are in some heat, aren't you, Linda?"
"Oh, James, this is unbearable... You don't know how it feels here!"
"I can imagine, but it is probably necessary," said the scientist. "And how do you use the toilet?"
Linda turned her back to him. He saw the opening for the asshole and instantly decided that he had to fuck that inviting, rosy circle. Too bad if she could not arrive to climax; he would not rape her, of course, but he wanted that and would not accept any negatives.
"Linda, you know what... I will ask Sean to give you some relief, but you have to do me a favor..."
"What is it?" she asked.
"I want to try you here," said James, rubbing the girl's ass hole with his finger.
"Oh!" Her face went blank with surprise. "Do you mean that I have to ... with the belt on... how could I? I do not come with ... er... with penetration here..."
"Well, it is up to you. If you agree, I might persuade Sean to let you have some pleasure soon. If not, you will have to wait."
Linda thought quickly. The tension in her clit was becoming unbearable. She did not particularly like ass fucking, but it seemed the only way to get out of that horrible thing, even for some minutes. She sighed; there was no alternative. Moving slowly to the desk, she held it with her hands, parted her legs and put up her ass cheeks.
James took his cock out and rubbed it on the small rosy hole. He put some saliva to his finger and wetted the girl; then he slowly slid his cock inside her and felt the firm pressure on his tip. Inch by inch, he moved into her, and, when he was halfway in, he commanded:
"You move back and forth, dear... Do your work..."
Linda was humiliated, but she complied. She could feel the cock entering her, throbbing from pleasure against the tight walls of her ass. James licked her neck and put his hands to her breasts; her nipples were rock hard, her whole body shaking with unfulfilled desire. The scientist lowered his hand and played with the lock of the belt, thrusting faster against the firm, white cheeks. Linda was breathing heavily, her labia itching with the need to be relieved.
"Milk me with your muscles, dear! Yes, like this... you do it so well!"
Linda did as she was told; then she felt the man spurting his juice inside her, kissing her back and licking her spine in quick, lascivious movements. He took his cock out and watched the girl gasping in desire, her slender body exposed to him.
"I will go for the key, Linda. But I want you to feel a special feeling... May I?" He opened a drawer and took out a chain about three feet long. He passed it swiftly inside the metal semicircle over the lock and hooked it to the desk bolt. Linda was so stunned that she could not think of a reaction.
"Now walk a bit," ordered James.
The girl walked as long as the chain would allow her. James smiled and told her:
"Now, you go back and hold the desk again. Stay so until I come back with the key. This way you will see how a centauress feels when she is attached by her pussy."
He left her there and went to meet Sean. They conferred quickly and James received the key to Linda's belt, as well as the measurer. He came back to the lab and took a long glance at the girl's body bent over the desk, her ass exposed, the chain dangling from her belt. He said:
"Linda, you are a true scientist! Now please stand up, I will release you. But first I have to cuff your hands behind you."
He went to her and cuffed her hands. Then he opened the belt and said:
"I know that you want most of all to touch yourself, but I have to measure you first." He rubbed her labia with the measurer and heard her moan in response. The scale showed maximum tension.
"Please, James, please... I can't stand this anymore... You will not lock this again, will you?"
"I have to," he replied. "Sean said you will be in for longer and longer periods, until you can stay locked a whole week without complaining."
Linda's eyes grew wide in terror.
"What?"
"Yes, dear. You have been locked for..." – he consulted his watch – "exactly 18 hours, and you are already in maximum tension. We will take note of that; next period will be, say, 30 or 36 hours, and we will increase the duration of the restraint. Now," he proceeded in spite of her terrified expression, "I suppose you need to have something done to this cunt..." He kneeled and took a long lick at the drenched labia, feeling the acre taste of her nectar.
"It is not like the centauresses," he said. "You probably do not have any Negro ancestry." Linda moved her body on the man's tongue, anxious to be relieved. But he took his face out and said: