(Note: Armin will be stronger in killing Titans. Maybe stronger than Eren. If you don't like it, then don't read this story. )
(Y/n) (L/n)'s best friend has always been Armin Arlert. They both have secretly liked each other. They both have always been there for each other. Even though Armin and (y/n) both are friends with Eren and Mikasa, they aren't as close to either her or Armin. She'd defend Armin from bullies even before Eren and Mikasa came along. Now they both are in the Scouting Legion, and Armin was really good at killing Titans. So is (y/n). But, he gets promoted to a higher rank. This might cause problems... With his higher rank, can they be together?
(Credit to @WinterFrost1212 for the suggestion to make an "Armin x reader" And for the storyline. This book is dedicated to them. )