Night(18+)

(Eren POV)

Eren laid on the king-sized bed. Thankfully, it was spacious enough for an invisible line to be drawn between him and Mikasa when they slept. He wasn't sure if he would be able to keep his mind clear if they were any closer.

The sound of water running came from the end of the room; Mikasa had begun to shower. They just returned earlier from the cemetery and the comfort of the pillow was heaven for him. He snuggled his face into softness and turned to one side.

"I wonder how Armin is doing, I haven't seen him for a long time ... " He glanced at the scenery outside through the window. Ever since the Trost Incident, Erwin had limited his interactions to the Special Operations Squad as well as a select few veterans, to keep his location a secret. As much as he disliked the restrictions, he understood the reasons behind it.

A red-colored book that lay right in front of his eyes caught his attention. Mikasa had been glued to it lately, but every time he tried to catch a glimpse, she would blush and quickly close it.

He reached for the elusive object, scanning the title. What was so interesting about a book that taught someone how to be a good wife? If it was Petra he could understand, but Mikasa was only fifteen like him, why would this interest her so much?

He glanced once more, to make sure she was still showering, and carefully flipped open the cover. Heat flooded his face as he took in the content page, in disbelief at the lewd and provocative sentences written beneath it. "T-this ... M-Mikasa's been r-reading s-something like this??"

"I g-guess I should find out more … "

Flipping it, he turned to a section titled: Making Love. Eren's eyes scanned through the page, his heartbeat rising with every sentence he took in. He finally understood what that act meant as he recalled their cadet days: how Armin would share with him his secret collection of erotic novels while they hid in a corner of a bunk.

Even though he was pretty smart, he never understood what the act described inside the books was for. Armin only told him that it was something done between opposite genders of eighteen and above when they loved each other.

Turning another page, he now knew - it was to make children. The fifth sentence of the paragraph made that clear, and the content after it elucidated various creative methods and ways a wife could do to get her husband in the mood to have … wait. W-why was Mikasa so interested in this kind of stuff? What was she up to?

The sound of water running had stopped, and he quickly placed the book back in its original position. He looked to see Mikasa stepping out of the shower room in a white buttoned shirt and black shorts; the attire fully exposing every curve on her chest.

"Is something wrong, Eren?"

He turned to face the other way. "N-nothing!"

Stop, please, just stop. He pleaded with himself. The dirty stuff he read earlier, and the clothes Mikasa wore, made his mind wander further and further into fantasy. All the content that Armin had shared with him before also now played vividly in his imagination. He sank his head sideways into the pillow while trying to muffle the fire within him. It's all Armin's fault, that pervert.

Mikasa laid down on the bed, close beside where he was, and turned to face him. Her warm breath was on his cheeks ."Are you okay, Eren? You're acting strange."

Why was she so near him? He pulled the blanket up, covering himself along with his face entirely underneath the thick white cloth."I-I'm fine, g-go and sleep, Mikasa."

"No, I won't until you tell me what's bothering you. Have you fallen sick?" Her voice was muffled slightly by the sheet.

"I'm healthy, Mikas-"

The blanket that covered him was yanked away, and Mikasa knelt in front of him, looking at him with concern in her eyes.

"D-don't come near me!"He jumped off his bed and retreated."S-stay w-where you are. I'll sleep on the floor tonight."

Mikasa ignored his words, moving towards him. "Did I do something wrong, Eren? Why are you avoiding me … "

He shook his head. "N-no, it's not you … D-don't come any closer! I-It's an o-order, soldier! An order! I'll p-punish you if you d-disobey."

The words seemed empty in his mouth and didn't stop the girl at all. He was forced with his back against a wall, and Mikasa placed her hands above his shoulders, her face right in front of his.

"Tell me, Eren." she asked again ."What's wrong? You've done so much for me already ... I-I want to help you."

She wasn't helping him, only making it worse. He looked into the dark eyes of Mikasa, there was no escape for him anymore.

"You can't, Mikasa. There's no way you would agree."

"Do you need me to do something, Eren?"

He paused and took a deep breath, deciding to be honest with her."Right now, I don't think I can control myself around you. I need time to cool down ."

"Control?"

"I-I have been having thoughts about … touching those things … " Feeling like a complete fool, he pointed towards the two proud peaks of her and let out a sigh. "J-just go to bed, please. I will sleep on the floor tonight ."

He stood up and walked away when suddenly he felt her hands pulling at his arm, and then his palm found themselves holding something soft and round.

"Y-you can touch them … as much as you want."Mikasa placed her hands now behind her back as she straightened up, causing her well-defined curves to be fully displayed.

His jaw dropped as he attempted to digest what she had just said. Did Mikasa really just … give him permission? Fighting back his desire to squeeze on the round mound, he clenched his teeth."Are you sure,y-you are fine with this?"

She tilted her head down slightly as her cheeks turned red. "I ... I w-want you to t-touch them."

The words caused his wall of defense to crumble at once. He planted his remaining hand on the other breast and sank the fingers in both his hands onto it, feeling the softness hidden beneath the fabric.

Mikasa's body squirmed at his touch, sending chills down his spine. "E-Eren."

"D-don't move." His self-control was withering by the minute, and he fought against the urge to unbutton that annoying piece of clothing that stood between his hands and her skin. He didn't understand why Mikasa agreed to it, but he wasn't going to go that far.

He put more pressure behind his fingers this time, kneading the perky pair of well-rounded flesh beneath her clothes; too thin and tight for her size. Mikasa moaned softly as her body arched backward, pushing her breasts deeper into his hands. He gripped and fondled her aroused peaks as the shape of two round buds, firm and taut, pressed against the center of his palms.

"Mmmm," Mikasa wriggled slightly, her mouth letting out a slightly strangled gasp.

He tightened a thumb and finger around one protruding pebble tip and pinched it cruelly through the fabric. Mikasa yelped and crumpled to the floor; her thighs, shuddering, squeezed against each other.

He halted what he was doing."D-did it hurt?"

"N-no. I-it feels good."Mikasa said meekly through her trembling lips, her eyes that were so filled with desire staring back at him."P-please d-don't stop."

She was driving him crazy. He gritted his teeth and began to brush his thumbs against the peaked rosebuds; Mikasa wasn't wearing a bra and the faint pink color hidden behind the two rock-like points on her white shirt was showing.

"P-please, E-Eren. D-do it again."She begged softly, her tone desperate and breathless.

The femininity and desire in her voice sent him over the edge. Eren cupped, squeezed, and massaged Mikasa's breast, eliciting another helpless moan from her. He was surprised at how her body, her iron-clad self-control withered completely beneath his touch.

He then circled both her buds with his thumbs, avoiding them intentionally until his name was on her lips again. Deciding to finally give her what she wanted, he carefully positioned his forefinger and thumb around each of the two delicate pebbles. He then began to pull at them lightly, then harder, then more viciously until she moved her hands in front of her black shorts, in between her shivering thighs clenched together.

"T-this is your p-punishment for not listening to m-me earlier."He aimed his fingers at the two tiny rigid buds that poked out under Mikasa's shirt and gave them a well-timed flick.

Mikasa let out a cry. Her legs, pressed together, spasmed uncontrollably as she pushed both her hands against the juncture of her thighs, hidden by her shorts. She then leaned against a wall, her hair a tangled mess spread out in front of her face. Mikasa breathed heavily while her perfectly rounded breasts moved up and down with every gasp. Her hands, covering the center of her legs, parted slightly; revealing a dark wet patch in the middle of her black shorts.

"S-sorry."He apologized and backed away. It seemed like Mikasa's nipples were uncommonly sensitive. It was definitely her weak spot.

"It's f-fine," Mikasa said coyly. She brought one of her fingers up to her mouth and sucked it slowly, and slid her other hand into her shorts, letting it roam between her thighs ."You c-can continue, Eren."

Did Mikasa learn that lewd posture from the book? Fighting back the urge to ravish her, he almost wanted to punch himself in frustration. She's your adoptive sister, Yeager. He chided himself. Mikasa had already been extremely accommodating to his fantasies, he wouldn't allow himself to go any further; that was for lovers.

He looked on at the alluring figure that gazed back at him, pleading for him to go on. For the first time, a shocking thought struck him. Was it possible that Mikasa actually loved him? That had to be impossible, she was just being overprotective; she had been that way all this time. But that didn't explain her behavior earlier; how she consented to his outrageous request.

Rubbing the back of his neck, he sat down on the side of the bed "T-thank you. I'm feeling better now. Y-you should go take another shower."

Mikasa kept quiet for a moment, biting her lips. She then pulled at her shirt, straightening it, and walked towards the toilet at the end of the room.

Eren glanced in her direction. Was it just his imagination or ... did she actually seem disappointed that they didn't continue?

He hugged a pillow to his face, trying to muffle the devilish thoughts that had emerged again. Mikasa was just being overprotective and ... yes! She was just caring for his needs. It had to be, that would explain what happened earlier. There was no way that she was in love with him. No way.

A/N:1.8k words. First Eremika smut UwU.