Prompt: Yandere!Armin

Eren was his. The brunette had told him so, and so it was true. That meant that nobody else was allowed to lay a finger on him, to even look at him. That's what belonging to somebody meant, right? That's what Armin told himself as he punched the girl before him one more time before letting her fall to the ground with a thump. She groaned, her hand coming up to try and stop the blood spilling from her nose.

Armin scoffed, not repentant in the least. This girl, this ugly, stupid, orange-headed girl, had made a pass at his Eren. She'd actually grabbed his arm, had smiled at him! The nerve. But Armin was sure she'd never do anything that idiotic again, if the broken nose had anything to say on the matter. He walked away, not looking back at the girl, not caring if anyone saw him. But he took a moment to remove the sweatshirt he'd been wearing, because the stupid girl had bled all over it, and that wasn't really his style.

He walked back into the school building, heading towards Eren's locker, smiling sunnily when he found his boyfriend already there and packing up his bag. Eren heard the footsteps behind him and turned, grinning just as widely when he saw the blonde hair and sapphire eyes.

"Hey." He greeted, tossing his bag over his shoulder and slamming his locker. Armin came around his side and grabbed for his arm, the same one the girl had touched, and pulled it to his body, hugging it to his frame.

"Hello. How was English?" Armin asked, pressing a kiss to the brunette's jaw.

"It was alright. A couple of things went over my head, but that's normal." He admitted, and Armin giggled, because he loved that quality about Eren. He loved every quality about Eren.

"I can help you catch up, if you want." Armin offered. He'd do anything for Eren, because he loved him, of course.

"That would be great. What about you? How was math?" Eren wondered, heading outside towards the parking lot where his bike was waiting for them.

"It was..." Armin paused, thinking back to what he'd done instead of math. "Fantastic." He decided, smiling.

"You always say that, but I don't see what's so great about equations and symbols." Eren grumbled, grabbing one of the helmets and shoving it over Armin's head, doing the buckle for him before pulling on his own. He hopped on and put the key in the ignition, waiting till Armin was seated behind him and had his arms wrapped around his waist securely before he kicked off and left the school parking lot behind.

Armin rested his head against the larger male's back, enjoying the ride but enjoying his boyfriend even more. Because Eren was just wonderful, so perfect, so sweet, and he was all Armin's, always. He'd said so, he'd promised. And even if he hadn't, Armin would make sure of it. Because that's what Armin did, he made sure of things. He made sure Eren was his, that nobody else touched him, that he never knew.

They made it back to their apartment. Eren asked Armin to move in with him shortly after he'd bought the place. He said it was lonely by himself, and Armin just couldn't have that, oh no. And who needed his stupid grandfather? It's not like the old coot actually loved him, not like Eren did. Armin didn't need him, but he needed Eren, and Eren needed him. He had told him so.

Eren dropped his keys on the coffee table, flopping onto the couch and sighing as he nudged his feet out of his shoes. Armin picked them up from the floor, taking them to the door. He should have been mad at Eren for being so messy, but he loved even that about Eren, and really, carrying shoes to the door was the least he could do, because he loved him just so, so much.

"Sorry." The brunette called from the couch. "I should have taken them off at the door." He admitted, but Armin only smiled and joined him on the couch, snuggling up to his side.

"It's fine, don't worry. You're tired." Armin supplied, backing up and turning Eren around, kneading his hands into the shoulders that were displayed before him. Eren groaned lowly, melting into the hands working out the tenseness from his muscles.

"Armin, you're the fucking greatest." He moaned, rotating his shoulders. Armin chuckled, because he knew that, Eren had told him. He continued to work the muscles until they were limp under his fingers, and then he moved down, pressing into the skin underneath his shoulder blades, getting a gasp this time. He continued on, working like an expert, not noticing when he started pushing harder, and Eren's moans went from those of pleasure to those of discomfort.

"Ow, Armin, okay, it's starting to hurt." He announced, but Armin didn't hear him, he was too focused, because he wanted Eren to feel good. But then Eren was gone, arching out of his hands with a yelp. "Armin!" He rasped. "I said it hurt!"

Armin blinked, his hands falling to his lap. He gave Eren an apologetic look, because he didn't mean to hurt him, no, no, definitely not. That was the last thing he wanted to do. Eren sighed, hugging him, because surely he looked like he was about to cry, because he was, because he'd hurt his precious Eren, and that just wouldn't do, oh no.

"Sorry, I didn't mean to snap. You just pressed a little too hard. It was great though, babe. I was so stressed out." He promised, kissing along the blonde's temple. Armin sighed, deciding he would believe it, even if it maybe wasn't true, because Eren had told him so.

Eren turned the television on for a while, choosing some kind of stupid show about coworkers who all actually hated each other. But that was fine, because that's the kind of show that Eren liked, so Armin liked it too, and laughed when Eren did, because it was only funny if Eren thought so. At some point, Eren searched out his hand and laced their fingers together, and it made Armin's heart flutter, because he loved it when Eren did that, and he knew that Eren loved it too, because Eren had told him so.

After the show, Armin excused himself to make dinner for them. That was his job, but he liked to do it, because food made Eren happy, and that made Armin happy, because Armin was always happy when Eren was happy. He decided to make one of Eren's favorites, beef stew. Armin didn't really like beef all that much, but he loved beef stew, because Eren loved it, he had told him so.

Eren joined him in the kitchen about halfway through preparations, grinning happily as he looked into the pot and realised what the blonde was cooking. He wrapped his arms around the smaller's waist and pulled him close, pressing kisses to his neck while he stirred the stew. Armin giggled, turning his head to receive a proper kiss, and it made his head spin, and it made Eren's head spin too. He knew that, because Eren had told him so.
"Did I mention that you're the fucking best boyfriend ever?" Eren wondered, and Armin chuckled.

"A few times, if I remember correctly." And he did. He remembered everything Eren told him.

They sat down for dinner, and Eren talked about his day, and Armin helped him to understand his English class, because he was a good boyfriend, and he wanted Eren to do well. He was washing the dishes, Eren drying, before anything went amiss.

"Armin, is that blood on your shirt?" Eren asked, surprise lacing his tone. Armin frowned, looking down, and noticing the spot on his light blue shirt for the first time. How had he missed that until then, how had Eren?

"Yeah, it looks like it." He agreed. "I had a nosebleed earlier, and I guess I got a bit on my shirt." He fibbed. It was effortless, because there was no harm done. It's not like it was a big deal where the blood had actually come from.

"Jeez, again? You need to start a vitamin regimen or something." The brunette said with a sigh, ruffling Armin's hair and pressing a kiss to the forehead he'd exposed. Armin laughed, because that's what Eren wanted him to do.

"Maybe I should." He agreed, finishing the last plate and handing it to Eren. The subject was dropped after that. They showered, did a bit of homework, then went to bed. And Armin curled up in his arms, and nuzzled his face into Eren's neck, because Eren loved that. He knew that, because Eren had told him so.

They went to school the next day, and parted ways for their separate third periods. Armin smiled and waved until Eren turned the corner, then scowled. He hated having different classes. He hated it more than the color orange, and he really hated the color orange. It was such a nasty, bright color. It didn't suit anyone, no matter how hard they tried.

He stomped to his class, sitting, waiting for the bell to ring so he could go and see Eren, and share a lunch with him, because he loved that, Eren had told him so. And finally it happened, and Armin flew to his feet and practically ran to his love's locker, but he wasn't there. Armin froze. He wasn't there, but he was always there, he was never not there. That just didn't happen. Where was he?

But there he was, turning the corner, his face red, like he'd rushed, and Armin sighed with relief, smiling at the flustered boy, took his hands and kissed his cheek.

"Sorry, I was behind with my lab in biology. My partner didn't show up today." He explained, and Armin thought about his Biology partner. She had orange hair. What a terrible color. But he'd made it look a bit better by staining it with a bit of red the day before. Red was a much better color than orange, he thought.

"That sucks. I hope she isn't sick." He said, and it wasn't a lie. He didn't want her to be sick, he wanted her to be dead. That was different, and that meant that it wasn't a lie. He didn't like to lie to Eren, and Eren didn't like when Armin lied to him. He knew that, Eren had told him so.

"Yeah, that would suck. But come on, I'm hungry now, let's go eat." He requested, taking Armin's hand and leading him outside. They always ate at the same place, a bench underneath a tree. When it got too cold, they'd sit in a hallway. They didn't like to eat in the cafeteria, because it was loud and hard to hear. And Armin wanted to hear every word.

But when they went outside, there were girls at their bench, two of them. Armin knew them. They were friends with the orange haired one. He glared at them until they took the hint, getting up quickly and walking away. Eren tilted his head to the side.

"Huh, they got up awfully quick! Do I really look that scary?" He wondered aloud. Armin laughed, because that was such a silly idea, Eren being scary. Eren puffed his cheeks out but sat, pulling their lunch out and picking out a few things that he wanted to eat. Armin did the same, and they talked about the way the clouds were shaped and how much they wanted to visit the ocean soon, and then the bell rang, and it was time to go back to class.

They had the rest of their classes together, except the last one, and Armin hated it more than the other class they didn't have together and the color orange put together, but he put up with it, because it would cause problems for Eren if he didn't. But when it was over, just like always, he raced to Eren's locker.

His stomach dropped all over again when the brunette wasn't there. That was twice in one day, what was happening? Was he just getting faster? But no, no, the clock on the wall said it was the same time it always was, and yet there was no Eren. Armin tapped his foot with worry. Where was he? Who was he with? What was he doing? He should be there, at the locker, with Armin, because Eren was his. He'd told him so, so it was the truth.

Armin was about to go looking, but Eren finally came down the hallway, walking slower than usual. Was that why he was so late? That could be okay, because Armin didn't want him to rush, he wanted him to be comfortable, because he just loved him so, so much. He waited for Eren to come to his side, giving him the normal, sunny smile, but it wasn't returned. Eren just got straight to work on packing his bag, didn't even greet his boyfriend. Armin frowned.

"Eren? Are you okay?" He asked, but he knew Eren was okay, he was always okay, Armin made sure of that. But Eren didn't respond, just kept packing, then shut his locker. He finally looked at the baby blues that were fixed on him, and his face wasn't happy. But why not? Armin always made him happy. He knew, Eren had told him so.

"Armin..." Eren trailed, looking away for a moment. "Armin, those girls said you hurt their friend. My biology partner. They said you broke her nose." He said, and Armin's eyes widened.

How could Eren think that about him, think such horrible things. Armin would never do that, of course not, no, because that would make Eren unhappy, and that was the last thing Armin wanted to do. No, no, it wasn't him, no. He told Eren so.

"Armin, please, don't lie to me." Eren plead, and Armin just frowned more. He wouldn't lie to Eren. Eren hated lying, he'd told him so.

"I'm not lying. They just wanted to get between us. I'd never do something like that." Armin assured, smiling and reaching for Eren's hand, but it was withdrawn before he could. Eren was still frowning.

"Let's go home." He suggested, leading the way out to the bike. Armin didn't like this, but he loved Eren, and Eren loved him, so it would be okay. Eren believed him, of course, because he'd always believe what Armin said. He'd told him so.

They rode home, and Eren dropped the keys on the coffee table, like always, but he didn't sit on the couch or take his shoes off, instead he stood, looking at Armin, looking as if seeing for the first time.

"Armin, this isn't the first time someone has said something like this about you." He admitted, and Armin's brows furrowed in confusion.

"What do you mean?" He asked, tilting his head to the side, his lips pouting.

"A lot of girls have said that you did something bad to them. But I didn't believe them. You're so sweet, and wonderful, I just couldn't imagine you doing something like that. I figured they were just jealous or something." He said. "But... They can't all be lying." He stated.

"Yes they can!" Armin exclaimed. Of course they were lying. He didn't hurt anyone. No, no, he was just keeping Eren safe, not hurting anyone. He wasn't doing anything bad.

"Armin... I had to go to the nurse today to get an icepack, because I fell in PE, and I asked her about all those nosebleeds that you get, because I was worried, and I wanted to know what vitamins you should take to help. But she said she'd never taken care of a nosebleed for you, that you hadn't even been in since you sprained your wrist a few months ago." He explained. Armin pursed his lips, but then laughed.

"I didn't go to the nurse! I can deal with a little nosebleed myself, silly." He assured, but Eren kept talking.

"The girls that talked to me today? They said she bled all over you. You were wearing a sweatshirt yesterday, weren't you? What happened to it? You weren't wearing it after last period." He remembered. Armin bit his lip, thinking about it.

"I got a little hot, is all, so I took it off and forgot it in my math class. You know how forgetful I am..." He began, but Eren cut him off.

"You're not forgetful, you have photographic memory, Armin. You're lying." He accused. Armin scowled.

"I am not! You're really going to believe a bunch of stupid bitches over me? Aren't I the best boyfriend ever? I'm so nice, and sweet, and thoughtful, and perfect. You always tell me so!" He yelled. Eren pursed his lips.

"Around the time you sprained your wrist? A girl told me that you'd punched her friend so hard you broke one of her ribs." Eren continued. Armin felt a frustrated tear roll down his cheek.

"I wouldn't do that! You know I couldn't! And if I'd hurt so many people, why wouldn't they be calling the police or something? They can't because I didn't do anything!" Armin screamed.

"You scared them, Armin! They're scared of you!" Eren screamed right back. Armin whimpered, hating to see Eren like this. He loved Eren so much, didn't he see? All of those girls were trying to take him away, but he was Armin's, he knew, because Eren had told him so. "Please Armin, just stop lying to me! I need you to tell me the truth!" Eren begged, and Armin couldn't deny him, because he hated lying to Eren, and Eren hated it when he lied, he knew. Eren had told him so.

"I didn't do anything bad! I was just protecting you! You're mine, you told me so. They were trying to take you away from me, Eren, please, don't be mad. I just love you so much Eren. And you love me too, right? You told me so." He cried, taking a step forward, but Eren took a step back. "Eren, please." Armin whined, reaching out.

"You hurt those girls Armin. You broke them." Eren snarled.

"I had to Eren, they were dangerous! They were going to take you away, and that's not okay, because you're mine. You told me so." Armin replied, taking several steps to close the distance, backing Eren into a wall. Eren tensed when his back hit the drywall, but he didn't take his eyes away from Armin.

"Armin, you're scaring me." He admitted, causing a frown to form on the blonde's pretty little lips. He knew they were pretty, because Eren had told him so.

"I'm not scary Eren! I'm just Armin, after all. I love you Eren." He whispered, pressing a kiss to the brunette's cheek. Eren shuddered, trying to move away, but Armin's arms stopped him.

"Let me go, Armin, I think I need some time to think." He said, but Armin just smiled.

"You can think right here." He decided. Eren's frown deepened.

"No. I want to be alone Armin." He growled, but the blonde wasn't swayed.

"You said that you were lonely before I moved in. I don't want you to be lonely anymore. So you can think here." He repeated.

"You can't force me to stay here." Eren snarled, trying to push away one of Armin's arms, but with no luck, earning a laugh. Before he even noticed there were hands about his throat, squeezing harder than he'd ever imagined Armin to be capable of.

"Of course I can, Eren. Because you're mine. You're not going anywhere. You're going to stay with me forever, just like you promised. Don't you remember? You said we'd get married. You can't take it back Eren. You love me, I know, because you told me so. And I love you, so, so much Eren. I just can't bear to think that any of those stupid girls even looked at you. I only protected you, I didn't do anything bad, not at all." He said, releasing the pressure on the other boy's throat and letting him gasp for air. "And you love me, so even if I had, you'd still love me. You do still love me. You'll always love me, because I love you so much, and because you told me so. You don't need to leave Eren. I'm here, and you don't need anything else. So we're going to stay here, together. You can't leave, because you're mine." He finished. And Eren knew, because Armin had told him so.

A/N: This was so much harder for me to write than I expected. When I saw the prompt I was like "I got this!" Then I started writing, and I was like "Woah, wait, how do you..."
So, I guess I should say sorry if Armin wasn't crazy enough to warrant the 'yandere' title. I gave it my best shot, but I'm kind of a subtle author, so maybe he came off as kind of normal after all. Sorry, I tried?

KuroRiya
九六りや