"How do you mean they left!?" Naruto exclaimed when he was allowed into Tsunade's office.
Seina arrived last since she had been working at the hospital. She barely had time to put her jonin uniform back on when a messenger appeared at the door and handed her a note from her teacher. When she reached the office, she saw Sasuke standing in front of the desk, arms crossed over his chest and frowning deeply, while beside him Naruto, also dressed as the tokubetsu jonin he was, was confronting the Hokage, hands planted on the desk as he leaned toward her.
"As you heard," the Hokage said irritably, shooting her brother a murderous glare. "He happened to pass by, heard them, and decided to join Team 10."
Sasuke glanced at her sideways, shifting his weight to move closer. Seina said nothing at all as she realized her husband had left the village to help Shikamaru's team hunt down those two from Akatsuki. Part of her was irritated that he had left just like that without even thinking of telling her. What if the Hokage hadn't caught them? What if he had died? Seina wouldn't have known what happened until she went looking for his body. Even so, another part of her felt relieved that Kakashi was protecting her friends.
"Before you keep yelling, knucklehead, let me tell you I was planning to send you as reinforcements. Otherwise, you would've given me a headache."
"Really?" Naruto asked with a huge grin. Then he looked at both of them, noticing Sasuke frowning and Seina looking irritated. He cleared his throat, losing the smile and straightening up stiffly. "Permission to depart, Hokage-sama?"
"Permission granted. Seina, you will lead the reinforcement mission."
"Hai."
They left without another word. She had a tracker on Kakashi, but knowing he was likely fighting Akatsuki, she thought better of using it. The last thing she wanted was to interfere with a fight and get allies hurt. Luckily, the tracker also worked as a coordinate point, so she simply pulled out her sealed-stone map and searched for the nearest one while her teammates watched in silence. Sasuke seemed comfortable in the quiet, but Naruto looked like he was bursting to say something, biting his tongue.
"Let's go. I've got a stone fifteen minutes away from them."
"Yosh! Let's beat those Akatsuki guys up!"
"Shut up, dobe, and hurry," Sasuke said as they sprinted across the rooftops toward the village gate.
They didn't take long to leave Konoha and teleport to the stone. Then they ran through the vegetation, hearing the sounds of battle in the distance. There were no screams, but she saw flashes of light that looked like lightning jutsu, Kakashi's specialty. They jumped into a small clearing just as a… strange guy with multiple faces stitched to his torso began releasing black chakra threads. Naruto, Sasuke, and Seina stared at him for a couple of seconds.
"Reinforcements!" Ino exclaimed. Seina glanced over her shoulder.
"Where's Shikamaru?"
"He's with the other one," Kakashi said, without a single scratch except for slightly messy hair. "Kuchiyose no jutsu. Pakkun, can you guide them to Shikamaru?"
"Naruto, Sasuke."
Naruto clicked his tongue, annoyed at being separated, but followed Pakkun along with Sasuke, who said nothing. Seina focused entirely on the Akatsuki in front of her, noticing Kakashi stepping beside her while Ino and Choji took the rear.
"What the hell have you done to yourself?" she asked the strange man, raising her voice slightly so he could hear her, but received no reply.
"We've already killed him a couple of times," Kakashi said. "He uses those black threads like your chains. He can also use multiple chakra natures depending on the masks."
"Understood."
"I know you," the man said, surprising them all. "Your face appears in Iwa and Kumo's bingo books. Konoha and its prodigies, as always. Maybe I'll take your heart to replace the ones you've taken from me. I'm sure I'll get a high price for the rest of your body."
"...I see," she muttered. This had to be Kakuzu, based on Itachi's description. Which meant… the other one fighting Shikamaru and the others had to be Hidan, the immortal. "Sorry to disappoint you, freak, but you're not leaving here alive today."
"Hmph… we'll see about that."
He lunged at them, but Seina easily defended herself with her adamantine chains. She saw him raise an eyebrow slightly in surprise before his masks moved to his shoulders and opened their mouths. She raised a barrier with her magic, effortlessly stopping the wind and fire attack. Using the smoke as cover, she vanished and pushed Kakashi and the others back with her magic. They understood immediately and moved into the trees, ready to support her if needed.
She reappeared behind Kakuzu in a silent movement he noticed too late. One of her chains destroyed one of his masks before he could jump away. Seina smiled maliciously when she realized he hadn't even noticed what she had done.
"Argh!" her enemy cried out, but quickly recovered.
Countless black chakra threads began emerging from his mouth and limbs. He really looked like a corpse stitched together. Seina, and Kurama, watched with some disgust, noting he still had two more hearts to destroy. Unfortunately for Kakuzu, he hadn't noticed the seal she placed during her first attack.
"Let's blow this bastard up with a bijuu dama."
"As you wish."
She raised a hand like a claw, swirling chakra in her tenketsu like Naruto did for the rasengan. She heard her husband's sharp intake of breath upon seeing it, but he said nothing. She had never tried her late father's technique before, having so many weapons and abilities of her own, but that didn't mean Naruto hadn't taught her. The blue sphere of chakra began mixing with Kurama's demonic chakra, spinning and growing to the size of a mandarin before condensing dangerously. It almost looked still from how dense it was, but Seina could feel the vibration of energy in her hand, waiting to be released violently.
"It can't be! You're not a jin—"
Kakuzu didn't get to finish. The seal she placed with her adamantine chain teleported the bijuu dama rasengan directly inside him without her even needing to get close. It exploded on contact, followed by a shockwave that nearly swept her away. She had to brace herself, covering her eyes as she heard her enemy scream for a split second before being disintegrated. In the end, she had to shield herself with several earth walls to contain her own attack.
"Damn, that was strong," she whistled, speaking to Kurama. Then she turned to the others. "Are you okay?"
The expressions on Choji, Ino, and Kakashi's faces almost made her laugh. They looked somewhere between disbelief and shock, and Kakashi, amused. No, not just amused. Her husband looked aroused. She saw it in his dilated pupils and the way he swallowed hard before looking down to compose himself.
"Wow…"
"You can use the rasengan?" Ino asked, snapping out of her stupor. "Of course. Naruto must've taught you."
"That's right."
"But what kind of rasengan was that?"
"A bijuu dama from Kurama," she said with a mischievous smile. "That was just a little chakra. I'm looking forward to using more and seeing what happens."
"You'd better not," Kakashi cut in, clearly serious. "We should go find the others."
"By the way, Kakashi," she said, stretching her words sweetly with a dangerous edge as they started running again. Something in her tone must have made things very clear, because Ino and Choji suddenly looked away, pretending not to be there while she glared at her confused, and worried, husband running beside her. "You did leave a note at home before leaving, right?"
"...Uh…" Kakashi began, clearly at a loss, his face turning pale. "N-no. I forgot. Sorry."
"We'll talk about this later."
She glanced sideways and saw Choji making a sympathetic face toward her husband while Ino was struggling not to laugh. She said nothing, continuing to follow her connection to her teammates. When they arrived, they saw their help wouldn't be necessary. Naruto, Sasuke, and Shikamaru were staring at what looked like a freshly covered pit of stone and earth. It didn't take a genius to know what was buried underneath. Seina observed them with a medic's eye, but saw they were all fine. In fact, Naruto and Sasuke didn't even look dirty.
"Seina-nee, is he dead?"
"Very dead," she said. Sasuke and Ino snorted at her answer.
"There's nothing left of him to take back to Konoha."
"A shame. I would've liked to dissect him." Then she looked at the pit. "Is the other guy in there?"
"Yeah. For the rest of eternity, if he really is immortal," Shikamaru replied firmly.
"Another shame," she said again with a sigh. "I would've put his head in a wastewater tank."
Ino and Naruto both gagged at the same time while the others grimaced in disgust.
"Remind me never to make you angry," Shikamaru said, tossing one of Asuma's cigarettes, unlit, into the pit.
Choji gave her husband a couple of pats on the shoulder with a sympathetic expression, while Ino looked at him with pity. Seina let out a small snort of laughter. She was a bit annoyed, but not enough to torture him like that. Kakashi, however, still looked somewhat pale. Maybe he thought she was going to yell at him. Or maybe he remembered the times she had taken revenge on people with her pranks. Poor thing.
The return to Konoha was very anticlimactic. In the end, the reinforcements hadn't been needed for much. She had been the one to kill Kakuzu, but she knew Kakashi could have done it alone or with help from Ino and Choji. He had only let her attack alone because Seina was very irritated and clearly needed to vent some of her anger on someone. Poor Kakuzu. Sasuke and Naruto, perhaps sensing her irritation, left them alone without protest.
"Seina, sweetheart, I'm sorry," Kakashi said as soon as he closed the door, scratching the back of his head like a little kid. "I saw Tsunade-sama arguing with them, and as soon as I realized they wanted to go after Akatsuki, I offered to go with them."
"Do you know what would've happened to me if something had happened to you and I didn't know why? I would've gone crazy searching for you all over the village, Kakashi!"
Kakashi hugged her tightly when he saw how affected she really was. Seina punched him hard on the shoulder before accepting the hug. She pulled him close, leaving no space between them, and buried her face in his neck.
"Don't ever do that again!"
"I promise."
Seina bit his neck. She wanted to leave a mark for a while as punishment. She wanted him to remember what not to do every time he looked in the mirror. He wasn't alone anymore; he had her, Naruto, Sasuke, and Itachi. He couldn't just disappear like that.
They appeared on their bed in a flash of her magic, falling straight onto the mattress—him underneath, her on top. She removed all his clothes with a snap of her fingers, then restrained his limbs with magical leather bindings. Kakashi didn't even try to break free. He was smart enough to know it would be useless, but even at her mercy, knowing she was going to punish him somehow, she began to feel an erection under her thighs. Men.
She took off her clothes very, very slowly, letting him watch with both eyes fixed on her, and then she knew just how to punish him. She refrained from smiling maliciously at what she was about to do. She hovered over him, kissing his face with light kisses, like the wings of a butterfly on a flower: his forehead, his eyelids, his cheekbones, the tip of his nose, his jaw… when she drew near his lips, Kakashi parted them slightly, implicitly asking her to kiss him, but she merely brushed his lips with the tip of her tongue. She watched his skin prickle and felt his erection pressing insistently against her back.
"Seina!" her husband almost pleaded, arching beneath her fingertips as they brushed his skin until they reached his nipples.
"Oh, no, my love. This is a punishment, not a reward."
She kissed his pale, smooth, hairless skin, working her way down to his navel. She slipped her tongue inside and nibbled at his abs whilst her hands slid down his hips, her nails grazing his pubis without once touching his massive erection. She crawled backwards until she was positioned over his pinkish penis, watching as its tip glistened pearly, desperate to come. She blew on the head of his cock, making him jump. She leaned back.
"Ah-ah," she said, mockingly, denying him contact.
She had him exactly where she wanted him. Desperate, anxious, aroused… she watched his chest rise and fall and saw how he was now trying to break the ropes binding his hands, to no avail. With a disappointed groan, he threw his head back, falling heavily onto the pillow.
"You're killing me, I swear."
"Your punishment has only just begun," she said, taking his cock in one hand and moving it slowly up and down until she got what she wanted, under her husband's watchful, delirious gaze.
He watched as she used a finger to collect his pre-cum. Kakashi stared at her again, as if he couldn't look away, and she crawled back up, and then further, and then further still until her knees were on either side of his face and her sex was right above it. She brought her free hand to her breast, taking hold of a nipple and pinching it whilst moaning over her husband, who could only watch her touch herself without doing anything. She stroked her stomach and then touched herself between her legs. First just a light touch, then she slipped a finger inside her vagina, listening to Kakashi moan beneath her.
"Do you like it?" she asked, parting her labia with the fingers of her left hand, letting him see how wet she was. Kakashi swallowed hard, smelling her shamelessly. "What do you think?"
She let him see, distracted as he was, her right index finger, coated in her pre-cum. Then she masturbated, using it as lubricant. She saw his eyes darken, and he struggled again; she even thought she heard a growl, but she was too busy pleasuring herself on top of her husband's face, not letting him touch her.
"K-Kakashi!" she moaned as she masturbated quickly, her hips undulating involuntarily and her eyes closing.
"Fuck! Untie me!"
"No!"
She heard him bang his head against the pillow again, and heard him moan. His body shifted beneath her legs, but he achieved nothing.
"Come in my mouth!" he moaned.
Seina said nothing. She came all over him, a short distance away. Before he could try to lift his head to lick her up, she withdrew until she was sitting on top of his cock, now redder and glistening more than before. He looked as though he was about to come, so she took hold of the base and her magic formed a tight ring beneath her fingers. Kakashi squirmed, growling as he felt it, but tried to thrust his hips upwards as she sat on his cock until she had it inside her, deep inside her. She was so wet that it took no effort at all to thrust, supported by his toned abs. She bounced on her husband's pelvis, pleasuring herself and denying him what he really wanted.
"Are you going to do something like that," she gasped between breaths, "any other time?"
"NO! I swear! I won't disappear without you!"
"PROMISE ME, KAKASHI!" she shouted, equally furious and aroused.
"I PROMISE!"
She snapped his bonds. Kakashi pounced on her, throwing her violently onto the mattress. In less than two seconds, he had her gasping for breath on the bed; he placed her legs over his shoulders and gripped her hips with both hands and all his brute strength. He held her so tightly, as if he didn't want to let her go, that she knew she couldn't shake him off unless she used magic. She closed her eyes with a scream as Kakashi began to thrust into her. She had no words, nor was she coherent enough to even shout his name. Her eyelids fluttered shut and her mouth fell open as she let her husband fuck her hard and deep, their pelvises colliding again and again and again.
"Get it off me!" Kakashi growled the command, almost frenzied. "SEINA!"
She had to think about his words for a couple of seconds before remembering the ring. She simply made it vanish. Kakashi bit her neck without hesitation as he came inside her instantly, over and over again. Seina screamed, her legs trembling and her breath ragged. She felt her pussy clench around her husband's cock, who didn't stop thrusting into her as he came harder inside her than she'd ever felt before.
A few minutes later, Kakashi collapsed on top of her, her legs splayed either side of his shoulders, crushing her breasts and body against the foot of the bed. They both gasped for breath, catching their breath without saying a single word. Kakashi lifted his hips as best he could, causing his penis to slip out of her with a shared moan. She felt his semen trickling down her thighs, staining the bed.
"I'm sorry," he said softly, his face still buried in her breasts.
"I know. I forgive you."
Kakashi kissed her heart before taking her nipple into his mouth. That night they slept hardly a wink as they reaffirmed their love and the fact that they were alive. When they finally went to sleep, hours later, the sun was about to rise. Seina fell asleep for a couple of hours in Kakashi's strong, protective arms, who didn't seem to want to let her go for even a second.
No one said anything about the obvious bite marks on both their necks. Nor about their faint dark circles, nor Kakashi's arm draped over her shoulder, pulling her close. The following days passed quietly, analysing the latest trivialities of the runic sequences.
"Are you sure about this?" she asked for the umpteenth time.
Sasuke looked at her, irritated. "Yes. Don't be such a pain."
"Alright, but if something goes wrong, don't come crying to me later," she said, earning a snort of laughter from him.
He lay down on the examination table, naked except for black boxers. She didn't want any distractions, so she had kicked everyone else out of her private office while she tattooed the runes onto his skin with iron rods and needles, in a tebori style. She quickly realized it would take much longer than expected, since Sasuke's blood mixed with the blood ink, forcing her to go slowly, wiping the blood away with a cloth over and over to see where she was working. Sasuke closed his eyes as she tattooed the runes in rows, starting from his feet and moving up to his hips.
She didn't know how much time had passed, but she had to turn on the light to see better, realizing it was getting dark. The smell of blood was overwhelming, so much so that she had to open the window slightly. She had finished the entire front, but the back still remained.
"Turn over slowly."
Sasuke obeyed, turning himself over. She avoided using magic so as not to interfere with the ritual, even though it would have been easier and more comfortable. She dipped the needle again into the prepared blood, infused under the light of the full moon, and returned to his feet.
By the time she finished, nearly fourteen hours had passed since she started, close to midday the previous day. Sasuke would have to let the runes heal naturally so they could settle without magical interference. Even so, he could use the ointments from the hospital she had prepared specifically for him. They weren't magical, but they would help him recover faster. With his ninja metabolism and regeneration, it would probably only take a couple of days to a week.
"How do you feel?"
"Sore."
"You are," she laughed. "Remember-"
"I don't shower for a day, I apply the ointment, I don't use your magical creations. I got it."
Seina rolled her eyes, but let Sasuke kiss her cheek in thanks. He dressed in his loosest clothes, clearly uncomfortable, and left for home. Kakashi wasn't fully awake, but not fully asleep either. She hugged him, watching as he dozed, faithfully protecting her back. Kakashi squeezed her hand and truly fell asleep once he felt they were alone and that she was finally in bed.
"I love you, my love," she whispered, kissing the back of his neck before she too drifted off into sleep.