Don't read if you haven't red pass chapter 70. I do not own Kimetsu no Yaiba or its characters. This is purely fanfiction for fun.
"Tell me, Tanjirou… What would you be willing to do for the sake of her humanity?"
Tanjirou stared incredulously at the demon holding his face in a forceful grip. He searched her ruby eyes, trying to detect any falsehood. Usually, Tanjirou could easily tell when someone was lying just by looking into their eyes, but this person, this demon, was extremely hard to read. How could he possibly believe in a single word that she said? How could she possibly believe that he would willingly allow her to be anywhere near Nezuko? For all he knew, this could just be a trap.
"I don't exactly like to kept waiting, Boy." Muzan narrowed her eyes in annoyance as she tightened her grip on his face. "Answer me now, or any hope you have of turning your sister back to a human will disappear along with my patience." She inched her face closer to his, as if searching for something. "Ah, you want to ask me something, don's you? I can see it in your eyes."
Tanjirou winced in pain when the foreign woman, who still had him pinned down like a rat, dug her heel even deeper into his stomach. "I-I can't trust you. You killed my family... Turned Nezuko into a demon..." He swallowed loudly. "W-Why would you help us?"
Muzan huffed. "That's not what you wanted to ask." She finally released his abused cheeks. "No matter. It's not your honesty that I need."
Tanjirou was taken back by her statement. Was he so easy to read?
"I'm going to get nowhere with this wanna-be earnest fool if you keep trying to carve a hole into his stomach, Anne." The demon woman directed her gaze to the blonde human in the room. "I think I've got it from here. The boy is no threat to me. Wait outside."
Anne slowly removed her foot from Tanjirou's stomach. "Muzan-sama, I cannot trust that this boy won't try to contact any one of his friends. If he is here, there is bound to be more of them. There might even be a Pillar present."
"I'm perfectly aware of that, Anne!" Muzan snapped. "Do you mean to insult me? I am perfectly capable of handling one unarmed boy. If you are so concerned about intruders, then stand outside and seal this room!"
Anne's cheeks flared in embarrassment. Her hardened eyes softened in what appeared to be sadness. "I-I deeply apologize, Muzan-sama…" She lowered her head in shame. " I meant no offense. P-Please allow me to be of use to you."
"Then do as you're told."
"Yes.." Anne lowered her head even further. She quietly scurried away and out of the room. Her hands hesitated to close the shoji doors behind her. One glare from Muzan moved her to shut them completely. Like a loyal dog waiting for her master, she cemented herself outside the room.
Tanjirou couldn't help but feel sorry for her.
He turned his attention back to the bane of his existence. "Answer me. Why do you want to help us!?"
"I never said I wanted to help you. I said I wanted to make a deal with you."
Muzan rose from her position next to him. She turned her back to him as she paced around the room. From the corner of her eye, she could see Tanjirou;s eyes following her every move carefully. This brought a smirk to her lips. The boy was right to be weary. It's not everyday when a dangerous predator comes to mingle with the prey. "I have a proposition for you... You give me something I want, and I will help turn your sister back into a human."
Tanjirou slowly stood up. "What do you want from me? If you want me to kill someone, forget it! If you want me to betray my comrades, I'll never do that!" He clenched his fists in anger. "Nezuko would never forgive me if I did those things for her sake."
Muzan stopped in her tracks. Tanjirou could smell her hesitation. What was this? Was the great Kibutsuji Muzan really afraid of answering a human's question? Such a thing almost made her look human...Almost...
As quick as the tender moment came, it disappeared.
Suddenly, Tanjirou felt a strong force push him. He feel backwards, slamming hard against the hard wood-flooring. Tanjirou's instincts told him to get up. He should bounce back. Raise his guard. Do something! Sadly, his human body could not keep up with the speed of a demon. In just a matter of seconds, the demon monarch rough snatched his obi, tied his wrists above his head, and pinned him down. Muzan straddled him with a humorous smirk.
"Now, who said I wanted you to kill someone?" She giggled. "As tempting as that is... That is not what I want from you..."
"Then, what!?" Tanjirou snapped. His patience had finally run dry. He couldn't bare to be in this monster's presence anymore. His hands itched for his sword. His entire body felt like it was on fire right now. There was nothing more than he wanted to do right now than to push her off of him, and run his sword right through her chest.
"What do you want, Muzan!?" His intense glare almost made Muzan think twice about her choice.
It will only be for a moment...Then reward will be well worth it...
She lowered her face to his ear. Her hand parted his yukata, feeling the firm chest underneath her. "I want..."Her hand traveled further down. "Your seed."
Tanjirou's whole body tensed when he felt a cold hand grasp his penis. "Whaaaaat!?"
Muzan's mad laugh filled the room. "Look at you! You're as red as tomato! Are you perhaps a virgin, Tanjirou?" She tilted her head in amusement. "Oh! But, look here!" Her hand tugged at his semi-hard penis. "You're reacting so quickly. Being surrounded by so many beautiful women. Having to hear them moan and scream as they pleasure their clients... Perhaps you were already begging to get aroused just from the sounds around you..." She giggled once more. "Such is the power of youth! This should be rather easy, after all."
"G-Get of-" Tanjirou's protests were cut off with an open-mouthed kiss. The flustered boy stiffened when the suprisingly-soft lips engulfed his. His hips tensed when the hand holding his member began to stroke him. His muffled protest were ignored.
A long, slithering tongue entered his mouth. It must be longer than the average tongue. Tanjirou could feel it touching the back of his throat. He tried to fight her back with his own tongue, but she was more skilled at this sort of thing. He could try to bite her, but he couldn't take the risk of accidentally ingesting her blood. All he could do was endure this long, deep kiss.I can't breathe!
Muzan broke the deep kiss. A trail of saliva forming between their parting lips. "You really are just an innocent little virgin..." She licked her lips. Her hand on his member began to move faster, pumping him. Tanjirou held back his moans, but then she began to squeeze his tip every time she pumped upwards. What is it!? It feels... Good!
Her unoccupied hand worked on removing her silky, expensive clothing. "Relax... This will be one of the most pleasurable experiences of your short life..."
Tanjirou was breathless. This demon killed his familhy, turned his beloved sister into a demon, stole his frits kiss, and now she wants to rob him of his innocence? How much more could this demon take from him? I want...Your seed.
Tanjirou was brought back from his thoughts when the hand on his member squeezed and tugged him. He yelped in surprise. His member was fully erect now. He had the animalistic urge to move his hips. He was somewhat relived when the hand on his cock released him. Her small hands parted her yukata, revealing her creamy, white skin.
Tanjirou's cheeks flared. He should be trying to look away, but his eyes were glued to her figure. Her skin looked flawless and soft. Her breasts were supple with two pink nipples staring back at him. His eyes subconsciously traveled from her soft shoulders to her soft breasts, small waist, wide hips, and all the way down to the small patch of black curls covering her womanhood.
His cock twitched in anticipation.
"How cute. Even though you're still a virgin..." The devious temptress lowered her face to his neck. "You respond so eagerly."
"Ah!" Tanjirou winced, half in pain and half in pleasure, when she nipped his neck. "S-Stop!"
"Do you really want me to?" She whispered softly as she continued to trail open mounted kisses down his neck and chest. She nipped the soft flesh with her sharp canines, sucking on it slowly. She could hear his heart beating loudly against his chest. His labored breathing and clenched jaw were signs of his retrain, but Muzan knew that the poor virgin could not possibly last long. "Don't worry. If all goes well, you and I will never do this sort of thing ever again." She went even lower down his body until she was mere inches away from his quivering member. "So, we might as well as enjoy it while it lasts..." Her long tongue darted out of her red lips to lick the precum running down his shaft.
"Hn!" His hips jerked up in response to her licking.
Muzan laughed at his reaction. She went reached behind her to undo her hair bun, releasing her thigh-length curly, black hair. Tanjirou wanted to run his fingers through it.
Her hand grasped his cock again. She aligned herself so that his hardened member touched her sensitive folds.
Tanjirou's eyes widened when he felt the heat of her wet lips. "Stop! I-I don't wan-"
"Don't want what? Don't want to help your sister? Tanjirou... Earlier you said that you would never kill anyone, even if it meant helping your sister. Well, I'm not asking for you to kill anyone... I'm asking you to create life... With me..." She began to drop her hips. "Inside of me..." She began to take him in, inch by inch. Her red eyes stayed glued on his widened ones. She stilled when she finally took him all in, from tip to base.
Tanjirou had never felt anything like this before. Her moist walls engulfed his sensitive cock. The sensation of being inside something so warm and inviting felt amazing. It felt so sinful, but so exhilarating! Just the feel of her muscles squeezing him felt like euphoria. He never knew that sex could feel this beautiful.
Muzan lifted her hips until only the tip of his penis was inside her. Then, she slammed herself down on him.
"Ah! What is this!?" He threw his head back in pleasure as the woman on top of him continued dropping and rocking her hips.
Each time she nearly unsheathed him, she would squeeze him. Her breasts began to bounce when she picked up her speed. She smirked when she felt his hips began to thrust upward, tryin to match her rythm. "Good boy! Make sure not to hold back!" She lowered her head to his chest. Tanjirou grunted when he felt her bite his nipple. By now, he had lost all sense of control. All he could focus on was trying to thrust upward into her hot cavern. His mind blanking from everything except the extreme pleasure he was feeling right now.
Muzan caught his parted lips in another deep kiss. This time, he responded with his own tongue play.
Tanjirou gasped when she began to message his balls. His penis pulsed in response. His balls tightened. He could feel something begging to build inside him. It felt like he was ready to burst. "I-I..."
"Cum, Tanjirou!" She shouted, quickening her pace. "Give me your seed!"
Her words sent him to the edge. With small burst of strength he broke free from his restraints. His hands grasped her hips to still them. His own hips jerked erratically as he released his seed inside of her. Tanjirou grunted like a wild animal with closed eyes. Muzan moaned as his hot cum filled her waiting womb. She caressed his face, almost lovingly. When he finished, she disconnected them slowly and gave him a tender kiss on his forehead.
"Good boy. I have to go now, but I promise I'll keep my word to you... If all goes as expected, of course..." She placed a soft hand over his eyes, coxing him to close them again.
Her smile was the last thing he saw before he passed out.
