Annie sat at the table eating lunch when Eren came home. "Look at who's up." he murmured jokingly as he took off his 3dm gear and rested it against the wall. "You're not very quiet when you leave in the morning." she answered, not looking at him. When Eren came over Annie looked up. "Want some?" she asked, she had more in the fridge. "Yeah." was the answer. Eren put his hand under Annie's chin and gave her a kiss. She was surprised, she didn't think he meant that. "Tastes good." he told her rubbing her head with his hand. "Titan's coming for you Annie!" Eren exclaimed to her playfully as he pushed down on her shoulders, making her lay on her back in bed. "Oh come on! That's so unfair!" she laughed. It was the next morning. Their heads turned towards the bedroom door as they heard a knock coming from the front door. "That'd better not be cockblock Armin." Annie muttered. "He's not that bad Annie." Eren murmured. Annie glared at him as there was another knock again. "Hey, at least we're fully clothed, nobody'd want to see that." Eren told her. "You sure about that for Armin?" Annie asked. "Annie!" Eren scolded. There was another impatient knock. "Better go that." Eren muttered, leaving the room and closing the door behind him. He answered the front door and sure enough it was Armin. "What?" Eren asked. Since Eren was still in his PJs, Armin immediately assumed him and Annie were sleeping before he knocked on the door. "Oh I'm sorry! Did I wake you guys up?!" Armin appologized. From the bedroom, Annie could here the whole conversation. "Oh, we were up for a while." Eren muttered under his breath. "Hm?" Armin asked, he didn't hear what Eren said. "Nothing." Eren told him. "Where's Annie? The news I'm about to tell you, you wouldn't want to hear twice." Armin explained. "Oh, she's- uhh, sleeping." Eren searched for an answer. "Well can you wake her up please?" Armin asked. Annie prayed that Eren would stall him for a second as she laid on her side in bed and pulled up the blankets over her shoulder, rested her head on her pillow, and made a faint smile as she closed her eyes, to make it look like she was having a good sleep. "Alright, come on I'll wake her up." Eren agreed. Eren opened the bedroom door and Armin was behind him. "Annie, Annie wake up." Eren murmured as he nudged her gently with the back of his hand. Annie slowly opened her eyes. "Hm?" she asked. "Armin apparently has something to say." Eren explained. Annie sat up. "Eren you might want to sit down for this." Armin warned. Eren sat down on the bed next to Annie. "Mikasa recently got really sick, I went to visit her this morning and she was coughing really hard and couldn't hard walk." Armin explained. "No way." Eren was wide-eyed and didn't believe it. "Bring her over here, I can take care of her while it's just me." Annie offered. "But Annie that's the thing, there's a type of medicine that can save her, but she won't get better without it." Armin explained to her. "I can go get her some." Eren said. "It's way too expensive, if I can't pay for it with me and Mikasa's money put together, I don't think you can." Armin explained. "We'll see about that, just bring her over here and Annie can take care of her while I go see the price for myself." Eren told him. "Alright." Armin agreed.
When Eren was at the shop where Armin told him to go. When Eren saw the price he went to the counter to talk to the owner. "Please! My sister will die without it! She's a part of your military with me!" Eren begged. "Sorry, you don't got the money, I can't do anything." the owner appologized. Eren gritted his teeth and looked at the ground from the thought running through his head. He was going to ask the owner would accept a trade, and by doing that he'd have to trade his most precious thing to him, and that would be Annie. Eren knew the owner would accept, because the sale price was high for titans on the black market. Eren hated the thought of letting go of Annie, but he'd get her back, he'd make sure. "Would you accept a trade?" he asked the store owner. "What would you trade for the medicine?" the owner asked, interested in what Eren had to offer. "How much for a titan?" Eren asked. "A titan? Do you mean a shifter, or a titan-titan?" he clarafied. "By titan, I mean Annie Leonhardt." Eren explained. "Leonhardt? You have possesion of Annie Leonhardt? The female titan?" the owner asked, really interested now. "The one and only." Eren answered. "I'll be back in a moment with her." Eren told him. "And I'll have your medicine waiting for you!" the owner called after him.
When Eren got back to the house, he explained everything. "I-I'll do it, for Mikasa's sake." Annie agreed, a little surprised he'd do that. "Thank you." Mikasa murmured from where she laid on the couch. "I made a deal with the owner that when I get the money, I'll buy you back. I promise." Eren promised her. Annie nodded and they left for the store. "Is that her?" the owner asked. "Yeah, it is." Eren said solemnly. Eren pulled Annie into a hug. "I'll get you back, I won't let anything happen to you, I promise." Eren promised again. Annie closed her eyes, making the hug last, she didn't know when she'd see him next. Eren let go and looked into her eyes, "This isn't goodbye, it's an 'I'll come back for you.' Don't forget it Annie, I won't let anything happen to you." Annie just looked down at the ground, sorrow in her eyes, then remembered, she was doing it for Mikasa. The store owner handed Eren Mikasa's medicine. Eren walked away and Annie wanted to follow, but she stood there, just like a solid statue. "Come on Leonhardt." the store owner muttered. Annie acted though she didn't hear, she didn't move, she watched the door that Eren walked out of, hoping it was just a cruel joke, but knew deep down that it wasn't. "I said let's go!" he ordered, tugging on her hoodie's sleeve, pulling her away. Annie took one last glance over her shoulder at the door, then followed. He led her down to a small basement. Inside he let go of her sleeve for a moment and lit a small lantern, hanging it on the wall, Annie could see her surroundings. There was nothing but a chain connected to the wall and connected to a chain-link collar on the other end. After she was sitting, the collar was slipped over head and tightened around her neck, so that she wouldn't be able to get it off. Annie felt scared more than anything. The store owner turned out the lantern and left Annie there. She began to shiver, the only things she had on were her white jeans, long-sleeved shirt, hoodie, and short black boots. Annie reached behind her head and took out her bun so that her hair covered her ears, keeping them a tiny bit warmer. Annie pulled her arms insode of the hoddie to keep them warmer and hugged her knees under the hoodie. Annie didn't sleep that night, she was too scared to close her eyes for a minute.