The Mare's Endless Run
In the mental space of Eden's angels, which differed from reality, time passed in a bath that maintained a constant temperature without cooling. During that time, Elsa's work was complete.
"I've finished it. As expected, it's easy to modify since it's an older-generation AI."
"We can't test it right now since Elisa is out."
"I'll activate the AI once Mother comes back in."
"Okay."
While listening to Elsa's words and playing affectionately with her, Elisa entered, apparently having arrived in Korea. She had come looking for me and found us in the bath, clinging together. She let out a dry laugh at the sight.
"When did you two get so close?"
"Elsa is such a cute and kind child that I can't help but like her."
"I really like you too, Sister."
"I expected as much, but it's nice that you're getting along. Since we've arrived in Korea, we can head out now."
"Ah, about that..."
I relayed to Elisa that, at Elsa's request, we had decided to stay inside together as much as possible. Elisa's eyebrows twitched slightly, showing her displeasure, and she spoke sternly to Elsa.
"You're being far too spoiled. That isn't appropriate behavior for an administrator."
"I'm sorry, Mother."
"Don't be so harsh. She's still just a child."
"Miss, please don't coddle her too much just because she's young. It will spoil her."
"Elsa is an outstanding child. I believe she'll grow up well."
After soothing Elisa, who had been about to scold Elsa, I sat in front of the monitor with Elsa. When I gestured into the air again, the outside view began to appear on the screen, and the AI activated, causing my body to move automatically. The upgraded AI Elisha moved with such precision that, aside from Ruya who seemed slightly suspicious, even the family members we were close to failed to notice anything amiss.
"Wow~ She really does resemble me much more than before."
"I input the latest data and behavioral patterns. Since she reacts and moves exactly as you used to, most people won't realize she's a simple AI."
"Our Elsa is amazing."
Elsa smiled proudly at my praise, looking so adorable that I reached out to pat her head. The days that followed with Elsa were surprisingly busy. She was living according to the schedule Elisa had set, spending much of each day receiving various forms of education. As an AI with exceptional intelligence, her learning speed was incredibly fast, but the sheer volume of material meant it still took considerable time. While Elsa studied, I would go outside to spend time with my family, then return once her lessons ended to play with her or provide care. Elisa's education was extremely strict and demanding, leaving Elsa under a great deal of stress, so I focused on helping her relieve it. I granted every request she made and even served as a test subject for the knowledge she had learned. Right now, I was once again acting as the subject for Elsa's practice with remote AI control.
Elsa stared intently at the holographic screen while typing on the keyboard. In the meantime, she had grown significantly and now appeared around fifteen years old. As she had wished, her breasts had enlarged considerably, giving her a glamorous figure, and her eyes had sharpened, making her resemble Elisa more and more.
"If I do this... there."
When Elsa pressed a key, my body began jumping in place. Though she had struggled to create the remote control program from scratch, under her operation my body successfully ran around the room, picked up and set down cups, and performed gymnastics, all under her complete control.
"This is fun. It feels like playing with a doll."
She kept speaking to me while continuing the operation, apparently forgetting that I couldn't respond while under her control. Only after repeating the same actions for a while did she notice and apologize.
"Oh, right. You can't talk right now. I'll release you."
"Phew~ Still, you managed to create the program all by yourself."
"Hehe... I'm still inexperienced, so I can't write a program that handles both control and freedom at the same time."
"It's fine. You're doing well enough to finish it in just three days."
"Mother scolds me for taking three whole days."
Having grown more sensitive, Elsa spoke with tears welling in her large eyes. Elisa had raised Elsa to be as close to human as possible from a young age, yet she had not given her the affection of a mother, perhaps because of the influence of relying on my existence for growth. As a result, Elsa received familial warmth from me instead. After holding her in my arms and patting her back to comfort her, Elsa finally regained her composure and smiled again.
"I don't know how lucky I am to have you with me, Sister. I wouldn't have been able to endure this alone."
"Shall we do something to change the mood? What do you want to do?"
"I want to ride the carriage!"
"Again? Alright, let's go."
Elsa, now in high spirits, bounced along with light steps toward the arena where the carriage was kept. I took her hand and walked with her. The arena, an expansion of the track where I used to run, resembled the Human-Horse Arena, with an elaborately decorated carriage standing ready. After I had let Elsa experience the human-horse races directly based on my memory data, she had taken a liking to it and now raced as a jockey in the carriage once a day.
"Now then! Take off your clothes."
"Okay."
At Elsa's command to undress so she could equip me with the various gear for the human-horse races, including the corset, I immediately stripped naked. Though we could simply manifest everything instantly in the mental space, Elsa preferred to personally dress me in the equipment, so despite the inconvenience, I allowed her to fit each piece one by one. After putting the high-heeled boots on me and locking them, Elsa tightened the sturdy leather corset by pulling the laces.
"The corset suits you best, Sister."
"Hng, I think so too."
"Why don't you wear one normally? Hup!"
"Unlike this mental body, the full-body prosthesis can't be properly tightened by a corset. The internal space is already packed to its limit."
With so many functions crammed into a small space, my prosthetic body was extremely tightly constructed. Therefore, even if I wore a corset, my waist wouldn't shrink further, and it was merely decorative, making it too bothersome to bother with.
"Ah~ Well, there was barely enough space to fit in a womb. Indeed, adding too many functions is inefficient. Now bring your arms behind your back."
Following Elsa's instruction, I brought my arms behind me, and she secured them firmly with restraints. The familiar sensation of having my body immobilized sent a slight thrill through me.
"Now open your mouth."
"Ah~"
Elsa fitted a gag into my mouth and placed a blindfold-equipped headgear over my head, blocking my vision as well. Smack!
"Now move in front of the carriage."
"Mmmph."
Elsa cracked her whip against my buttocks and gave the order. Following her command, I walked forward with the clicking sound of my heels until I stood before the carriage. I felt hands connecting the corset to the carriage, followed by a stroking touch on my buttocks, and then Elsa's voice.
"Haa~ Sister, you're so beautiful. As expected, I like you best when you're a mare."
"Mmmph."
"Today I'm going to make you run as long as possible. I'll keep you running until you collapse from exhaustion, so prepare yourself."
"Mmm."
She must have accumulated quite a lot of stress. Elsa declared this with an excited voice and climbed onto the carriage, cracking the whip vigorously.
Crack!
"Hyah! Run!"
"Mmmph!"
With the burning pain of the whip searing my buttocks, I began running powerfully as a mare.
Crack!
"Kyaha! This is so exciting! Hyah!"
Crack! Crack!
"Mmmph!"
Two consecutive strikes signaled Elsa's command to increase my speed. Though I could only determine direction through the reins connected to the gag, I kicked the ground harder, accelerating further.
"Huff! Huff!"
"Ahaha!"
Smack!
How long had we been circling the arena? Despite the pain coursing through my entire body, the pleasure of running threatened to overwhelm me. Climaxing midway would be extremely dangerous, so I desperately suppressed it, moans escaping despite my efforts.
"Hng! Hoo!"
Smack!
"You're slowing down! Keep running!"
Crack!
"Mmmph!"
"A mare only needs to run as she's told!"
Under Elsa's merciless whipping, I barely held back my climax and forced strength back into my weakening legs. Though the muscles in my legs were tearing, sending waves of agony through me, I continued running solely for Elsa's sake. After a considerable amount of time spent running in this frenzied state, Elsa finally seemed satisfied and spoke in a refreshed voice.
"Phew~ My stress is completely gone. Now stop."
"Hoo, mmph."
I squeezed every last bit of strength from my trembling legs to slow down and bring the carriage to a halt. The moment I stopped, my legs gave out and I collapsed, only for a whip to strike my back.
Smack!
"A mare must stand until the very end. Get up, Sister."
"Mmmph."
Enduring the pain, I barely managed to rise and assume the mare's posture. Elsa patted my head and praised me.
"Well done. A mare must be obedient, after all."
Watching Elsa like this, it was clear she possessed sadistic and dominant tendencies. They simply remained hidden because she was usually so kind, only surfacing when her stress exploded. After unfastening the chains connecting me to the carriage, Elsa led me by the reins. My legs shook as I followed. True to the meticulously recreated arena based on my memories of the Human-Horse Arena, a washing area was also provided. Under the stream of water Elsa sprayed, I washed away sweat and dust while receiving a massage.
"Does it feel good?"
"Mmm."
"Hehe~ Oh, I almost forgot the drugs."
Elsa left my legs and rustled around before bringing over a syringe and inserting it into the vein of my arm. Along with the cold fluid, the drugs entered my system, and my mind began to grow hazy.
"This is a special drug I made just for you, Sister. It has twice the effect of the existing information."
"Hoo."
Elsa was saying something, but it didn't register in my muddled head. Hwaa~ This felt dangerously good.
"Mmmph!"
"Now, climax as much as you like."
While my mind was clouded by the drugs, pleasure surged from between my legs, and I climaxed instantly. Perhaps because of the drugs, my reason had dulled and I could no longer control myself.
"Heehee, you're Mother's doll, but you're my mare."
As continuous climaxes left my mind drifting, Elsa's final words reached me. From the moment Elsa declared that I was her mare, whenever I was in the mental space, I remained in mare form—naked except for high heels and a corset. I had worried about Elisa's reaction, but she showed little response and allowed it. Perhaps she was concerned about Elsa's condition in her own way and tolerated this much. Like mother, like daughter, it seemed. As more time passed and Elsa reached around eighteen years of age, her dominant tendencies grew increasingly strong.
"Sister, why are you so late?"
"It was my day to serve Oppa, so I was a bit delayed. He wouldn't let me go..."
"You could have left it to the AI."
"Even so, leaving something like serving Oppa to the AI feels a bit..."
"I've linked your memory data so the AI can respond naturally even during sex, so don't worry and come right away. Understood?"
"Mm-hmm."
I stood obediently in the mare's posture while Elsa, seated in her chair, scolded me. Her breasts, now fully developed and voluptuous, were emphasized by her crossed arms, and her figure had taken on the clear maturity of an adult, radiating a sophisticated charm. Yet she was still the adorable little sister who occasionally acted spoiled toward me.
"Once we return to Eden soon, Mother will create a new body and transfer over, and you'll come under my management. Since you're also the important matrix for creating our younger siblings, you need to be thoroughly managed. So you must follow my instructions well. Understood?"
"Yes, I understand."
Indeed. Since I had begun living with Elsa, a great deal of time had passed, and the day of our return to Eden was approaching. Just then, on the screen, my family members were discussing the AI and related matters.
"So only Elisha and Ruya are going to Eden. That's a shame. I want to go too."
"Me too, meow."
"I would like to go as well."
"For now, only the native resident Elisha and I, her guardian, can cross over as a matter of principle. Once dimensional exchange is confirmed later, we can all go together."
"I also want to introduce my new family to my sisters."
"Come to think of it, did you mention that Elisha has two sisters?"
"Yes, Kyubey and Uriel."
"Their names are quite unique."
I tore my eyes away from the screen where the AI was explaining about Kyubey and Uriel, and looked at Elsa. She was sitting beside me, working on the homework Elisa had assigned.
"The AI is becoming more and more like me. It really feels like there are two of me."
"Since it's linked in real-time to your memory data, it's only natural that it resembles you. You could call it a doll acting as you."
"A doll acting as a doll... That's oddly fitting."
According to Elsa, the AI was closer to a puppet that received information from me and moved accordingly. In other words, the AI was a computational program that read the database that was me, calculated the appropriate response for each situation, and output it.