Basically your S/O sees that your injured. To the person who requested this, sorry it took so long for me to write and post this. Also sorry for any mistakes in advance. I did not reread or double check these.

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Eren: You were out a scouting mission and you were in a different group than Eren. Suddenly an abnormal showed up, and you were in charge of giving one of the more experience member an assist. So you were doing your thing you slashed the titans ankles, but unfortunate you didn't stick your landing and you tumbled onto the ground, hitting your head. Your head quickly got bandaged up and the mission went smoothly the rest of the time. When all the groups were back inside the walls Eren called out to loudly. He asked you what happened to your head and you told him to relax and that you were just giving you an assist. He didn't like that you told him to relax so he hit you on the head for being a careless ass person. Later on he apologized though and he gave you a hug too. 

Mikasa: You were currently helping citizens evacuate during a wall breech and a titan came rushing towards everyone. You and Mikasa both raced to get the titan first, but Mikasa beat you. She slashed the titans neck and it crashed into the side of the building. A piece of debris from the building slashed your forehead, but you didn't even feel it. After the chaos calmed down Mikasa noticed you has a gash in your forehead and she asked you what happened. You had no idea what she was walking about but when you saw the blood you figured it was from some debris. She apologized and wiped the blood off your forehead with her sleeve.  

Armin: When he sees you in crutches he instantly becomes worried. He rushes over to you and pesters you with questions, asking if you're okay. It takes you a minute to get him to calm down and stop acting like such a spaz. Once he's more calm, you tell him that you were goofing around after a mission and lost your balance from standing on a rock, and you fell and twisted your ankle. He looked at you, and he just walked away...

Levi: When he see's your arm in a sling he rolls his eyes and gives you a hug, asking you what happened. You told him that you were cleaning up your house and basically somehow you managed to to pull a muscle in your arm. Another eye roll and he took you home and finished up cleaning your house for you, while telling you that you did a terrible job cleaning. You were just happy to have him safe back with you so you didn't mind. 

Hange: You were in town minding your business when all of a sudden you see a fight break out. Being the type of person you were you went over and tried to break up the fight. Bad idea, you got hit right in the lip, there was a nice split down the middle now. Luckily, even though there was a lot of blood, the cut wasn't too bad. When Hange was back from their mission and they went to your house, Hange was surprised to see you holding a bloody ass rag up to your face. They asked you what happened to and you told them. Suddenly Hange just burst out laughing, making you angry and flustered. 

Jean: You were goofing around during training with one of your friends when you were supposed to be sparring. When you guys got serious, you ended up with a black eye. During dinner literally everyone made fun of you. Jean approached you and sat across from you and the first thing he said was, 'geese what the hell happened to you?'. You got a little defensive, but told him and he told you not to worry too much about it and that you'll 'beat them next time.' It made you feel better, because you weren't expecting him to be so chill about you getting punched in the face. You asked him to give you some of his food to make you feel better and he told you no. He said, and I quote: 'no, that's what you get for being a dumbass and getting punched in the face.

Sasha: You and Connie were playing catch with your dull blades like dumb asses and even though they were dull you still managed to cut your hand. You dropped it on the ground and your blood started merging with the dirt. Suddenly Sasha popped out of no where and was like 'hey whatcha guys doin- Oh my Gog Y/n' you're bleeding!!!!!' And you tried to tell her it was no big deal but then she started balling her eyes out saying that you were going to die. After 30 minutes of you and Connie having to reassure her you weren't going to die before she believed you guys. Afterwards you gave her like 20 steamed potatoes to make her feel better. 

Connie: Literally you were just running around, chasing little kids, when all of a sudden your body decided to face plant into the dirt. You put a band aid over the area where you a little pebbled cut you. The next time Connie was around you he noticed that band aid and poked you, which hurt. He asked you what happened and you told him. He kissed her band aid forehead and told you that you need to be more careful next time.

Bertolot: So basically when Bertolt saw the brace on your finger he was more confused than anything else. You weren't really the type to get hurt easily. When he asked what happened you told him you got mad at your mom so you slammed the door and basically crushed your fingers. You ended up breaking your middle finger. Bertolt thought that was kind of funny and he suppressed his laughed, but you caught on and scolded him. He gave you a hug and told you not to be mad at your mom. 

Reiner: You were chopping up some food and accidentally cut your finger. Just then Reiner came to your house. He was met with the sight of there being blood all over the counter while you held a bloody knife. Reiner dropped all his things rushed over to you, taking the knife from your hand, asking you what happened. You tell him, and that's when he notices the food on the chopping block. Instantly he's hit with a wave of relief and he helps you bandage up your finger. you guys still have a good laugh about that. 

Zeke: Basically you saw a big ass spider and you tried to kill it it jumped on you and you jumped back and smacked your head into something causing it to bleed. You went over to Zeke's house all gross and bloodied and looked horrified at your disheveled. He asked you what happened, but you wouldn't tell him until after he cleaned you up and helped with your wound. Once he did that he asked you what happened and you burst into tears. He hugged you tightly and asked if you were hate crimed or something. You told him no and then told him about the spider. He let out a sigh and was like, 'do you want me to go over and find it to kill it?' and you were all like 'yes please.' He shook his head in disappointment, but honestly this was better than you being attacked on the street. 

Porco: Porco was supposed to be coming over, so you decided to make him a cake. All was well until you had to take it out. You had Oven mits on but still managed to burn your freaking hand. You nearly dropped the cake in the process, but luckily you didn't. You decided to ignore the pain and finish up the cake. When he got over to your house the first thing you did was complain about how you burned your hand making him a cake. He asked if you put your hand under water, and that's when you realized you didn't. He helped you take care of your hand and you guys ate cake together on the couch. 

Pieck: You had just gotten back from a week long mission, and so you kind of beat up. Not all of your little cuts and bruises had healed yet. When Pieck went to go to pick you up the first thing she did was hug you, and asked if you had cleaned your wounds. Sometimes you came back with missing limps, so a few scrapes and bruises was a miracle. You told her you cleaned them all, which made her happy, but when you went home she cleaned all your cuts again, just in case. You took a shower and the both of you relaxed in bed for the whole rest of the time your injuries were healing. 

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Lmao...sorry I've been gone. Writing basically paragraphs for 13 people is a lot more work than I thought it would be smh. Also my writers block when it comes to coming up with scenarios...HOLY SHIT I NEVER KNOW WHAT TO WRITE!! Okay bye...