(minor spoilers actually. I like this pairing but I don't know about you guys 8'DD and it's been very long since I wrote anything. Well, enjoy!)

"I'll take responsibilities" Mikasa said, staring into Rivaille's menacing-looking eyes.

Rivaille didn't say anything but stared back. He turned away and limped a few steps before he worked on his maneuver tools. Mikasa, followed from behind, focusing solely on the figure within the corporal's arm; her dearest Eren.

Eren… I'm glad you're safe but… now I'm in debt with this short corporal. Mikasa let out a sigh of relief but it turned to a discomforted glare. She never wanted to be in debt, not Eren not Armin and definitely not Corporal Lance Rivaille who had beat the shit out of Eren and saved him. Was he an enemy or not? He might be an ally to the humanity, but what about Eren? What about Mikasa? No- She definitely wouldn't let Eren be taken away. Her Eren was hers alone.

Unprecedented events happened when the Scouting Legion presumed a suspect of who might be the one who had killed the experiment titans as well as the female titan. A battle took the place within the Wall of Sina and caused Eren to lose his conscious. He was then brought to a room.

Mikasa waited for Eren to wake up which made up the conclusion that she hadn't slept at all. She sat near the bed Eren was sleeping in. Then she recalled what had happened back in the forest. She clenched both fists on her thighs. As expected, she couldn't accept the fact that she screwed up, owed someone and had her Eren being saved by the corporal. As extra, her Eren being held in Rivaille's arm.

"Mikasa, we'll leave Eren to you then. Get any rest you can." Armin said as he excused himself out of the room along with Jean.

"Yes." Mikasa nodded and smiled a little. She saw Armin and Jean went out of the room and she turned her gaze to Eren. She pondered again about being in debt and it made her feel frustrated to her disgust. A sudden knock on the door brought her back to her senses and she went to open the door. To her surprise and dislike, it was Corporal Rivaille.

Rivaille slid through her and walked up to see Eren. It made Mikasa feel uneasy and insecure. What is he going to do with Eren? She wondered, looking wary of Rivaille.

"hmph." Was all Rivaille voiced. He marched his way back to the exit, walking out. He had walked half way when he decided to go back. "Ackerman." He called out.

Mikasa turned around and faced him, tilting her head to the side in confusion. "Yes?!"

Rivaille sighed, looking not amused. "you owe me one." He buzzed off.

"tch." Mikasa frowned; biting her lower lip. She finally decided to look for Rivaille in his office. She looked at Eren's peaceful sleeping face once and swiped his bangs away from his forehead. She planted a soft kiss over his forehead and excused herself. "I'll be back soon."

Soon enough Mikasa reached the door to Rivaille's office. She was about to knock on the door before the door was flung open and almost hit her. She reflexively sent her fist forward, stopping the door from pushing further and left a crack on it.

Rivaille came from behind the door, glaring at Mikasa in which Mikasa returned with a hard stare. Silence filled the air for a moment before Mikasa retracted her fist and did the salute. "Mikasa Ackerman, present."

"I thought it was time you appear." Rivaille walked back into his office, sitting on the chair behind his desk. Mikasa assumed she should follow into the office and she did. As expected of the clean-freak, everything was neatly arranged and books were all in the shelf.

"How am I supposed to repay?" Mikasa asked; sounded ignorant. Apparently, she thought it was a right to compensate the way the victim wished.

"not up to it?" Rivaille asked, taking a sip of his tea as he stared at Mikasa. Rivaille seemed to notice the ignorance in Mikasa's tone.

"no sir." Mikasa replied, knowing the corporal noticed of her unwillingness.

Rivaille kept his stare on her. "I saved your life. How do you think you should compensate?" He asked, walked to the spot in front of Mikasa and sat on his table; making him just a little bit shorter than Mikasa. He crossed his arms, waiting for the reply.

"I have no idea, sir." Mikasa replied bluntly. I won't let go of Eren for sure and he's not getting Eren. I have to make him step away from Eren.

"How do you think of life?" Rivaille asked, taking another sip of his tea.

"Precious, sir." She replied.

"How about you give your precious thing to me. Very easy, isn't it?" He suggested, eyeing her.

"I will not hand Eren over!" Mikasa snapped, looking anxious.

For a second, Rivaille seemed to be smirking. Weakness, found. He thought. He crossed a leg over another, still waiting. Seeing how nervous Mikasa was, made him happy a tiny bit. He had taken a penchant over this girl who was oddly attached to Eren Jaeger.

"If I insist on having him?" Rivaille provoked, placing the cup of tea down.

"I'll make you give him up." Mikasa clenched both fists. She sounded very determined which amused Rivaille even more. What would Mikasa give to keep Eren safe?

"How are you-" Didn't manage to finish his words, Rivaille found this girl even more amusing. She actually took a daring step to tighten their proximity by pulling his shirt's collar and kissed him. In return, Rivaille kissed back and licked her lips before he pulled away.

"I've paid my bill. Excuse me." Mikasa walked towards the exit, wiping her lips. It was clearly shown on her face how the act disgusted her. However, a strong hand yanked her back and banged her onto the wall. Two hands seemed to restrain her hands.

"not quite precious." Rivaille said.

"kh." Mikasa sent her forehead forward, trying to head-butt Rivaille but he dodged it fluently. She was going to kick him in his groin but her legs were trapped between his.

"not being obedient."

"let me go."

"I won't let go of Eren otherwise."

Mikasa admitted that she was definitely not the upper-hand when Eren—her Eren was at stake. She became speechless. She looked away; cheeks a bit flushed.

"Good." Rivaille said before he dived to nibble on her soft lips. Mikasa tried to struggle but to no avail. No—she wasn't going to lose. She said it that she would make Rivaille give up on Eren. She had to retaliate. She forced herself to kiss back and bite Rivaille's lower lip. She wrung her hand free to take a grip of Rivaille's back hair and force a deep kiss between them. At least, this much should keep him away from Eren. She thought.

Rivaille's free hand(which Mikasa's hand wrung out from) slid under her jacket and unbuttoned her shirt. Apparently, it made Mikasa pushed him away. Rivaille pulled her along, dragging them falling onto the sofa. They breathed faster. Rivaille turned the table around, hovering above Mikasa. He continued to unbutton her shirt while he kept her busy with a deep passionate kiss, forcing his tongue into her mouth and had a tongue fight. Mikasa's arms circled around his neck, pulling him closer.

Rivaille moved downward, removing the scarf around her neck though Mikasa struggled to keep the scarf. Although the scarf was not fully removed, at least it was not covering her neck anymore. Rivaille went to nibble and suck on her neck, making her moaned softly.

A disturbing knock rang. "Rivaille! Rivaille! Are you in? can I come in? are you cleaning?" Shit. It was Hanji.

"shut up." Rivaille said to Mikasa, biting on her neck, drawing droplets of blood. Mikasa withstood the pain, not making any sound.

Rivaille removed himself from Mikasa. "tch" he grunted. "dress yourself in a minute while I get the door." He walked to the door, opening it slightly. Rivaille and Hanji had a stupid talk about titans and the conversation ended with a bang of the door. Hanji pouted her lips and returned to her room.

"You may go" Rivaille said, leaning on the wall beside the door.

Thus, Mikasa excused herself, face feeling hot and frustrated to return that bite Rivaille did on her neck. I'll take my revenge on his neck next time.