Armin pov
Today's the day of are next expedition, I'm so worried about it I can't stop shaking I have a really bad feeling about it. I'm mostly worried about y/n my girlfriend of 2 years.It's almost time to go I've just finished readying my horse when I spot y/n talking with Eren she's gonna be part of Levi squad for this mission their job is protect Eren. "Hey y/n" I say walking over she turns to look at me her with her sparkling e/c "hey Armin" she replies happily wrapping her arms around my neck. I wrap my arms around her waist we share a tight hug. "You ok love?" She asks me sweetly "um...ye..yeah I'm fine" my voice shakes as I reply "I can tell somethings wrong your shaky. So what's wrong?" She asks putting her hands on both my cheeks gently rubbing with her thumbs. "I just have a bad feeling about this expedition, stay safe ok" I ask "of course Armin you stay safe to" she leans in and places a gentle kiss on my lips. "All soldiers mount up" the commander orders "see ya later Armin" she gives me quick peck and leaves to get her horse.
Small time skip
We're all waiting outside the gait to the outside waiting for the commander to give the order to advance. I look back and see y/n she gives me a big smile, I smile back. "SCOUTS ADVANCE" the commander order we all start forward. Little did I know that would be one of the last times I'd ever see y/n smile again.
Another time skip
We were deep in Titan territory everything was going wrong we discovered another intelligent Titan just like Eren. We had the female Titan captured but now she's loose we're sure she's after Eren Levi squad has gone after her. Me, mikasa and captain Levi are heading after her. We pass what use to be Levi squad their bodies splattered all over the place. As we catch up I see y/n trying to fight the female Titan. Suddenly the Titan swings its arm back grabbing y/n wire flinging her back smashing into a tree "YYYYY/NNNN" I fly to where her body lays on the ground. She's bleeding from her head, her leg and arm are clearly broken and twisted in a abnormal way "y/n...y/n...can you hear me?" I say shaking her gently holding her in my arms, she coughs up some blood "ar...Armin" she says weakly her eyes barely open. Mikasa lands behind us. "Y/n your gonna be ok just hang on" I say frantic "armin... I'm not gonna..." "NO your gonna be fine y/n I can't loose you to..." tears are streaming down my face "I've lost my parents my grandfather I can't loose you to" I say sobbing "I'm sorry... we won't get to see the ocean together" "please y/n no" I beg "I'm sorry..Keep living please...I love you" she uses her last bit of strength the press her lips to mine and falls down dead in my lap "NOOOOOOOOO" I scream balling my eyes out. I feel a gentle hand touch my shoulder "armin we can't stay here" mikasa says resting her hand on my shoulder "I can't leave her here" I hug her body close "take her back to the wagon I'll go after the female Titan" i nod as mikasa flys off. Holding her body I take off and head back to the wagon.
I arrive Jean, Connie and Sasha run towards me "armin are you ok" Sasha asks I don't answer and just push past them and walk to my horse "armin?" Jean ask stopping by placing his hand on my shoulder "is that y/n" Connie ask worried "yes" they all gasp, i knock jeans hand off getting on my horse placing y/n behind me. "Armin?" Sasha questions one more time I sit there when the retreat signal is fire I start galloping off.
I promise you y/n I'll live for you and...I'll never forget you.
An- ahhh that hurt my heart to write my poor baby armin. Anyway I hope you enjoyed. Let me know if you enjoyed or if there are any mistakes.

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Armin x reader oneshots and lemons
FanfictionThere isn't many or any armin one shot stories so I'm gonna make one myself. Feel free to request.