The Promise [Eren Yeager x Fem! Reader]

chapter three

[Eren's POV]

The tension between Eren and Ymir was so thick that it made anyone else uncomfortable being in the room--that, and Ymir kicked people out. They sat opposite of one another on couches in a lounge area, y/n resting peacefully on Ymir's lap. Eren was pretty sure she was asleep, her chest rising and falling rhythmically with the sound of her breathing.

"Are you going to tell me what you were doing with her in the bathroom?" Ymir said, arms crossed and eyes shooting the sharpest daggers.

"She spilled her drink on me and insisted she cleaned it off. The bathroom was the only place we could find a towel." Eren answered as politely as he possibly could, resting his hands in his lap like a child being called to the principal's office. He could tell Ymir was not someone he wanted to mess with.

"Did you think of using a napkin, dumbass? This place has a kitchen."

"Y/n insisted on the bathroom. She's got a good grip, y'know."

"So you're blaming her." Ymir raised an eyebrow, uncaring brown eyes boring into his. He couldn't entirely tell if she was being serious or if she was just trying to get a rise out of him. "If she wasn't asleep on me right now, I'd beat your ass to a pulp. What would you have done if I didn't find you guys?"

"N-no! I'm not blaming her at all! I just...I recognized her right then...and I would've let her drag me anywhere." Eren responded, the last half of the sentence retreating into a mumble. It was partially true--when she looked up at him, all those memories of their childhood together came back, and...he could no longer resist her. "And I wouldn't have done anything else with her, if that's what you're thinking. She's drunk and I know better."

Though, if he said he didn't want to take that little red dress off of her, he would've been lying.

There was an awkward silence before Ymir started talking again, as if she wanted to choose her next words very carefully.

"When you brushed her off that day, like she was a fucking fly, it crushed her." Ymir said. Eren's face dropped in guilt, and he couldn't bring himself to look at Ymir anymore. "I've been friends with her since high school, and when we first met, she literally would not shut up about you. About how you made this whole promise and gave her that key. She still has it--did you know that?"

Eren's eyes went wide.

The key.

How could he have forgotten? The last four years had been a complete whirlwind, and some things he just had to move on from to stay afloat.

"I see you've got nothing to say, probably because you feel so guilty you can hardly form a thought. I can't stop you from getting to know y/n again, but just know if you pull any bullshit with her, I will kill you."

There was a brief pause as Ymir gently shook y/n awake. She looked at Eren one last time as if she was trying to burn holes right through him. "I know what kind of person you are."

Eren watched pitifully from the stained frat couch as Ymir and y/n stumbled away, Ymir's last words echoing through his head. She was completely spot on. He had more than enough skeletons in his closet.

***

[Y/N's POV]

Fuck...You muttered as you woke up, clutching your forehead to soothe the pounding feeling going on in your head. You were able to squint your eyes open, but the bright light only intensified your headache. Ymir was still asleep on her bed across from you, her arm thrown behind her body as she slept in some kind of twist.