Sex Demon Training System

Background: The protagonist is named Mo Yan, 19 years old, a freshman in college. His parents work in another city and usually don't come home for months at a time. Because his parents have good jobs, the family is relatively well-off. Only his older sister, Tang Yanran, is with him at home. Tang Yanran is 20 years old and a sophomore in college. Mo Yan is a sister-obsessed person and has some ambiguous feelings for his sister. They are like siblings, but also like lovers. Basically, they have done everything except for the last step of their relationship. Mo Yan also has feelings for his neighbor's beautiful daughter, Xu Chunying, 18 years old. She treats him like a younger sister. They have been childhood sweethearts since they were kindergarten classmates and have been classmates since college.

Prologue:

In 2015, Mo Yan, a typical otaku, was immersed in the world of anime and manga when he suddenly received a notification that there was a new email in his inbox. Curious, he opened the email, and a line of text suddenly detached from the computer screen and floated in mid-air: "I am the Demonic Training System. After screening, you have been selected as the most suitable being for this system. Are you willing to become the host of this system? Yes/No."

Mo Yan was startled by this strange phenomenon, but out of curiosity, he clicked "Yes." The floating text suddenly shrank into a colorful dot and rushed towards Mo Yan's forehead at an extremely fast speed. Mo Yan was startled and tried to block the light with his hand, only to find that the light passed directly through his palm and entered his forehead. Immediately afterward, a voice sounded in his mind: "Host aptitude test in progress, please wait."

About 30 seconds later, a "beep" sounded in Mo Yan's mind, and then the system's emotionless voice suddenly rang out: "Host scan complete, please see detailed analysis." Then a virtual screen popped up in front of Mo Yan's eyes, listing his basic attributes: Name: Mo Yan Gender: Male Age: 19 Level: 1 Strength: 5 (Affects your attack and carrying capacity, normal value is 10)

Agility: 5 (Affects your speed and agility, normal value is 10)

Spirit: 20 (Affects your affinity and resistance to mental attacks, normal value is 10) Otaku
Quality

: The most typical otaku. Due to a lack of exercise and staying at home for a long time, his body has become thin, but his spirit has increased. Effect: Strength -5, Agility -5, Spirit 10 Sister Complex: As an otaku,
liking your older sister is understandable. Effect: Older women's favorability towards you increases by 10 Sister Complex: This is an essential basic quality for an otaku. An otaku who isn't a sister complex isn't a good otaku. Effects: Women younger than you gain 10 points of favorability towards you. All-rounder: As an otaku who appeals to both mature women and young girls, all women gain an additional 10 points of favorability towards you. Skills: None. Summary: You are a completely typical otaku, appealing to both mature women and young girls. Other than that, you are useless. As the host of this system, you still need to work harder. (P.S. This system won't comment on how far you are from your goal.)

Mo Yan smiled bitterly after reading the report. Does a system have emotions? Before he could react, the system popped up another notification box: "Given the host's weak body, the first enhancement is now beginning. Countdown: 10, 9, 8, 7..." Mo Yan panicked immediately. "Hey, system, what's going on? Why did this inexplicable thing suddenly start? Stop it!" The system ignored Mo Yan's cries and the enhancement began. Mo Yan's vision went black, and he fainted.

Chapter 1 The Lustful Demon Summoning System

"Hey, Xiaoyan, wake up, are you alright?"

A melodious voice entered Mo Yan's ears. Mo Yan groggily opened his eyes and found two spherical, hemispherical objects swaying in front of him, emitting a faint fragrance. His older sister, Yanran, supported herself on either side of Mo Yan, saying with a worried expression, "Xiaoyan, are you alright? You scared me to death! When I came back last night, I saw you lying on the ground and thought you were sick." Mo Yan grabbed his sister's slender waist and pulled her tightly into his arms, rubbing his morning erection against her lower abdomen, and said with a mischievous grin, "Sister, do you think I'm alright?"
Yanran's face turned bright red, and she said coquettishly, "Little brother, you're so naughty! Get your naughty thing off me!" Mo Yan was quite helpless. "It's a natural reaction. Who can blame me when my sister is so beautiful and charming? Hmm, let me see, you must have an E-cup by now." Yanran's face flushed even more: "It's all because of that chest-strengthening exercise you made me do. Ugh, I'm ignoring you. I have to go to class. You can rest at home for a day, I'll ask for leave for you."

Mo Yan thought about how he still needed to study the system today, so he simply agreed. Yanran changed into her school uniform. "I'm leaving now. Don't forget to eat. I put the food in the rice cooker, and there's hot milk in the microwave. Bye-bye."
Mo Yan felt a warm feeling in his heart. After getting up, washing up, and eating breakfast, he returned to his room. "System," Mo Yan called out to the system in his mind. "System, are you there?" The system's emotionless voice sounded: "I'm always here. As long as you want to say something, I can receive it." Mo Yan asked, "System, what's your background? And what happened yesterday?"

"This system originates from the planet Nameia, approximately 2000 light-years away. There, men are revered. This system was developed to manipulate women. Upon completion, a small black hole appeared for unknown reasons, sucking the system in and placing it on Earth. The system has just completed initialization and requires a designated host. You are the most suitable. However, since this is a trial version, you need to complete assigned tasks to upgrade the system. This will provide more functions and more items to exchange. As for yesterday, it was because your physique was too weak. This system gave you a free boost. You can check your attribute panel."
Mo Yan eagerly opened his attribute panel: Name: Mo Yan Gender: Male Age: 19 Level: 1 Strength: 12 (Affects your attack and carrying capacity; normal value is 10)

Agility: 12 (Affects your speed and agility; normal value is 10)

Spirit: 30 (Affects your affinity and resistance to mental attacks; normal value is 10)
Quality

Otaku: The most typical otaku. Due to prolonged lack of exercise and staying at home, his body has become thin, but his spirit has increased. Effects: Strength -5, Agility -5, Spirit 10. Sister Complex: As an otaku,
liking your older sister is perfectly understandable. Effects: Increases the favorability of women older than you by 10. Sister Complex: This is an essential quality for any otaku; an otaku who isn't a sister complex isn't a good otaku. Effects: Increases the favorability of women younger than you by 10. All-Around Appeal: As an otaku who appeals to both mature women and young girls, all women gain an extra 10 favorability points towards you. Skill: Seduction: Emits spiritual power, temporarily increasing the favorability of a designated person by 30 for 2 hours. Can only be used once a day (unlocked when Spirit reaches 30).

Evaluation: Through the enhancement provided by this system, you have transcended the realm of the weak and gained your first skill. It is hoped that with the help of this system, you can conquer one beautiful woman after another. (P.S. You're just getting started, newbie.)

Mo Yan asked the system in confusion, "What's this 'favorability rating' thing? What's it used for?"

The system replied, "Favorability rating is an important standard for whether you can win over or even seduce and manipulate women. 1-20 is stranger, 21-40 is familiar, at this point you can ask them to do some simple things, 41-60 is friend, they won't refuse most requests, 61-80 is respect, they can do anything as long as it's not too outrageous, 81-99 is reverence, you can basically get them to do anything, and 100 is the highest, they treat you as their master and won't refuse any of your requests. Of course, the target still has self-awareness."

"Hey, system, what's this 'exchange' thing you mentioned before?"

"This system has all sorts of training tools and abilities for the host to exchange. There's nothing you can't find, only things you can't imagine. The host can check the exchange list themselves."

Mo Yan immediately opened the exchange list excitedly. Before, he only played with erotic glamour, which was too unsatisfying through a computer screen. Now that he's finally the male protagonist, how could he not be excited?

The exchange list is divided into three categories: items, medicines, and abilities. Mo Yan first opened the item category, only to be met with a cold shower. Looking at the meager selection, he asked the system speechlessly, "This is what you meant by 'everything'?!" The system remained emotionless: "More exchanges require the host to upgrade the system to see."

"Uh..." Mo Yan reluctantly opened the ability category, and his eyes lit up immediately. Yes, tentacles! The most classic element of erotic games. Excitedly, Mo Yan opened the tentacle option and found many categories: ordinary tentacles, electric tentacles, enema tentacles, deformable tentacles, plant tentacles, mechanical tentacles, etc. Except for ordinary tentacles, the others were all marked as unexchangeable, clearly requiring a system upgrade to purchase.

Mo Yan pursed his lips, seeing he had 300 exchange points, and casually exchanged for a vibrator and an ordinary tentacle, spending all 300 points.

Immediately afterward, Mo Yan opened the task panel, which displayed three tasks: "The Target's First Orgasm," "Adding the First Training Target," and "The First Drop of Blood."

"The Target's First Orgasm"

Task Objective: Make any woman orgasm. Task Reward: 200 Exchange Points. "Adding the First Training Target"

Task Objective: Add any woman to your training targets. Hint: You can see the attributes of the women added to the training panel at any time and use skills on them. Task Reward: Loyalty Ring (Attribute: Makes the woman wearing it reach maximum favorability towards you and will not disobey your commands).

"The First Drop of Blood"

Task Objective: Take the virginity of any woman. Task Reward: 500 Exchange Points. Closing the task panel, Mo Yan's heart surged with excitement. "Sister, you're mine!"

Chapter Four: Sister's First Night.

Mo Yan finally waited for his sister to return that evening. Thinking that tonight they would finally break through the final barrier, Mo Yan's heart burned with desire. For this reason, he even cooked dinner, something he never did before, eagerly awaiting Yanran's return.

When Yanran returned home, as soon as she opened the door, Mo Yan rushed over with lightning speed, hugged her tightly, and buried his face in her firm, perfect breasts, rubbing against her, saying, "Sister, I missed you so much!" Yanran blushed and said coquettishly, "Did you really miss me, or these darlings?" Mo Yan felt guilty, "It's all the same, the same."

Only then did Yanran notice the aroma of the food. "Oh, the young master has finally decided to cook." Mo Yan scratched his head sheepishly. "I do housework sometimes, okay? Let's eat first, I have something important to tell you after dinner."
"Oh, is there anything more important than the young master cooking?"

Mo Yan was embarrassed and angry, lightly patting Yanran's plump buttocks, making Yanran blush. "Let's eat first, we'll talk after dinner."

After Mo Yan put the food on the table, he sat down in a chair, patted his thigh, and said, "Sister, sit here." Yanran blushed and glared at him, but still obediently sat down. Mo Yan, with one arm around his sister and chopsticks in the other, shared the food with Yanran. Soon, Mo Yan's left hand quietly placed on the inside of Yanran's thigh, slowly crawling towards the groin, Yanran's sensitive area. Yanran glared at him, "I knew you were up to no good."
Mo Yan's hand gently caressed her until it touched Yanran's panties. The touch was slippery, and he knew Yanran was aroused. He gently slipped his hand under the edge of her panties, accurately finding her sensitive clitoris. With a gentle pinch, Yanran let out an "Ah!" and her body went limp. Knowing Yanran had orgasmed, Mo Yan withdrew his hand, his hand covered in glistening fluid. Mo Yan put his fingers in Yanran's mouth and said with a wicked smile, "So sister is that sensitive. Try your own 'jade fluid'." Yanran blushed and obediently licked the fluid off Mo Yan's hand. Mo Yan was about to continue teasing Yanran when she pleaded, panting, "Good brother, please let me go, I can't take it anymore. I'll satisfy you later, okay?" Mo Yan had no choice but to stop.

During the meal, Mo Yan added Yanran to his training list. He checked Yanran's attributes and found they were completely different from his own: Name: Tang Yanran Gender: Female Age: 20 Measurements: 102/70/89 Favorability: 70 Mood: Shy Sensitivity: a Shyness: b Initiative: d Lewdness: d After the meal, Mo Yan told Yanran about the system and the Loyalty Ring, then asked very seriously, "Sister, are you willing to accept me? Once you wear this ring, we'll be together forever." Yanran smiled gently, "Silly brother, we're already one. Why wouldn't I accept it?" Without hesitation, she put on the ring.

"Hmm, it's really amazing. My memories and personality haven't changed, but my feelings for you have increased infinitely."

"Of course, this is worth 500 exchange points in the system. Even an F-level tentacle ability is only worth 200 points." Hearing this, Yanran blushed so much that her neck turned red. "How could you exchange for such an evil ability? You naughty little brother, you're not planning to use it on me, are you? I... I don't want to!"

"Oh? Really? It's said that the pleasure brought by tentacles is unparalleled. Sister, don't you really want to try it?" Mo Yan teased with a mischievous smile.

"Really... really? Even... even so, I don't want to." Mo Yan vaguely saw steam rising from Yanran's head.

"Just kidding. How could my dear sister give her first time to tentacles? Sister, today is your big day."

Mo Yan laughed and picked Yanran up in a princess carry, heading towards the bedroom.

"Ugh, so embarrassing! I'm finally going to give everything to my little brother!"

Mo Yan carried Yanran into the bedroom. "Sister, take off your clothes,"

Yanran said with a troubled expression. "Should I take them off myself?

" "Ha, you've done this so many times already, are you still shy? Okay, then I'll reluctantly help you, sister." With that, Mo Yan slowly approached Yanran and suddenly kissed her. "Mmm... Mmm..." Mo Yan's tongue chased after her nimble little tongue, and before she knew it, he had taken off all of Yanran's clothes. "Sister, I love you." A lustful strand of saliva still connected their parted lips, and Yanran's face turned red again. Mo Yan placed his hand between Yanran's legs, gently caressing her. "Sister, you're naughty, you're wet so quickly." Yanran moaned softly, "No...don't say it, it's too embarrassing." Mo Yan smiled wickedly, "There's something even more embarrassing." Starting from her slender neck, Mo Yan kissed his way down, pausing briefly at her ruby-like nipples. "Sister, you're hard here, so beautiful." Yanran was too busy to answer Mo Yan, only able to breathe softly. Mo Yan's lips moved downwards, stopping at her navel. "Sister, your navel is so cute, and it smells so good." Yanran stuck out her tongue and touched her navel with the tip. Yanran trembled, her body stiffened, and then went limp, panting, "Good...good brother, not there...not there, um...it's too sensitive there...ah..." She had an immediate orgasm. Mo Yan played with Yanran's small navel, grinning mischievously, "So your navel is a sensitive spot, huh? Looks like I haven't explored it enough. As your brother, I'm really neglecting my duty."
Yanran rolled her eyes at Mo Yan, "Only a brother like you would think about lewd things every day." Her alluring eye roll, combined with her flushed white skin, was indescribably captivating.

Mo Yan was stunned: "Sister, you are so beautiful. But how dare you talk bad about me? I'll punish you." Mo Yan's body slid down suddenly, and he directly sucked on Yanran's vulva with his mouth. His teeth gently bit the already erect clitoris. Waves of tingling pleasure rushed to Yanran's head, and Yanran's head suddenly tilted back. Due to the excessive pleasure, crystal saliva slid from the corner of her mouth and dripped onto her firm breasts, adding a touch of lewd beauty. "Mmm...no...it's dirty there...oh...good brother...don't stop." Waves of pleasure rushed to the top of her head, as if her consciousness had left her body. At this moment, Mo Yan directly inserted his tongue inside, the rough tongue scraping against the tender flesh inside the vagina, bringing a pleasurable sensation of itchiness and numbness. Mo Yan's tongue even touched Yanran's hymen, causing Yanran to scream, "Ah...I'm going to die...um..." Her body shuddered violently, and a large amount of vaginal fluid shot directly into Mo Yan's mouth, sweet with a slightly fishy smell. Yanran's eyes rolled back, her beautiful body trembling for more than twenty seconds before calming down.

Mo Yan brought his mouth closer, and Yanran immediately understood his intention, but there was no way to escape. As a result, Yanran tasted herself again in Mo Yan's mouth.

Once calmed down, Yanran playfully scolded, "You naughty little brother, you're so bad! I felt like I almost died just now!"

Mo Yan grinned mischievously and said, "Sister, you enjoyed it, but he's still holding back." He pointed to his penis and said, "Considering how hard I've worked today, how about we try deep throat?"

Yanran gave him a charming glare, leaned down, and took Mo Yan's penis into her cherry-like mouth. Mo Yan's penis filled Yanran's mouth completely, but it still couldn't accommodate his entire penis. Helpless, Yanran had to lie on her back on the bed, letting her head droop off the edge of the bed so that her head and esophagus were in a straight line, which allowed Mo Yan's penis to enter her throat.

Mo Yan felt his penis enter a wriggling, warm, narrow passage. Every time Yanran swallowed, it caused her throat to wriggle violently, like a massage. At first, Mo Yan was afraid of hurting Yanran's throat, but later the speed of his thrusting increased, and finally he ejaculated directly into Yanran's throat. A large amount of thick semen was shot directly into her stomach. When Mo Yan pulled out his penis, Yanran coughed violently. Seeing this, Mo Yan asked with heartache, "Sister, are you alright?" Yanran shook her head, "I'm fine."

Mo Yan picked up Yanran and placed her on the bed. "Sister, get ready for the most important moment of your life." Mo Yan rubbed his penis against the outside of Yanran's vulva, making her crotch wet, before slowly inserting his penis. Yanran was in pain and sweating profusely, which made Mo Yan feel heartbroken. "Sister, are you alright?" Yanran said, "I'm fine, let's continue. We all have to go through this." Mo Yan hardened his heart, thinking that a short pain was better than a long one, and pushed hard. He immediately felt a tough membrane being pierced. Yanran cried out, "Ah—", and hugged Mo Yan tightly with both hands, her face full of pain. Mo Yan immediately stopped moving and slowly massaged Yanran's sensitive spots to help relieve her pain.

After a while, Yanran felt the pain lessen, followed by a strong sense of emptiness. Blushing, she said, "Little brother, it's so itchy inside!" Her ears turned bright red. This was the first time she had ever spoken so openly to Mo Yan. Mo Yan was overjoyed and slowly began to move. A strange pleasure welled up in Yanran's heart. Each time Mo Yan withdrew, she felt a sense of emptiness, followed by a feeling of fullness from his penis. Mo Yan's penis was enormous, rubbing against the folds of Yanran's vagina. This plunged her into boundless pleasure. "Ah...good little brother...harder...um...deeper...no...don't stop...um...I'm going to die...I'm going to fly...ah..." With a scream, Yanran experienced her first vaginal orgasm. A gush of vaginal fluid sprayed directly onto Mo Yan's glans, and Mo Yan ejaculated as well. A large amount of semen shot into her uterus, causing Yanran's lower abdomen to swell slightly. The hot semen churned inside Yanran's belly, bringing a strange sense of fullness, which made Yanran smile happily.

After their lovemaking, the two remained in the penetrating position and fell asleep exhausted.

The End

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