This was a prewritten story that I've had on hand for a while. I have a few of these that I'll be using since I've found them. (They're really short.)

This was originally my very first Armin X Reader that I have ever written, so I'm sorry if it sucks. I'm still kinda running out of ideas. Suggestions are much appreciated. Thanks!
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You guys met at your lab. Yes, your lab. You have became quite the scientists of your era, even Hanji was nothing compared to you yet, she oversees most experiments.

You never entered the training corps like everyone else did; you didn't need to. Your father is Erwin Smith. He was the one who introduced you to Armin Arlert. He knew about Armin's genius and that you two would make a great team. In other words, your father was trying to play matchmaker with you since you hardly left your lab.

Armin wasn't necessarily smarter than you, but he definitely was in fact more sane than you. That was okay though because he accepted and loved you for you. In fact, many nights he slept in your lap waiting for you to finish whatever you were working. He was the sweetest thing ever to exist in your life.

"(F-F/N)?" He asked groggily. He lifted his head up from his arms and saw you working frantically. You didn't stop when you heard his voice.

He attempted to get up but stumbled sleepily over his own feet. You somehow managed to catch him.

"Sorry babe," you started, "I really have to finish up the work on this piece of titan flesh before it disintegrates on me. Give me five more minutes." You gave his cheek a quick peck then got back to work.

He can do that you didn't like interruptions, so he just watched you work anyway. Your (h/l) (h/c) locks trailed behind you as you ran from one side of the room to the other. He smiled at that, and what he had mind for you.

Later...

After trying to stay awake and watch you work for a half an hour, Armin was happy that you were finally done. He planted a kiss on your cheek from behind. You turned to him and place your hands on his chest.

"I'm so sorry! That took so much longer than I expected. I'm sorry that-" He stopped your talking by giving you a quick kiss. He pulled something out of his lab coat, but kept it hidden.

"None all that matters to me, but what really matters is," he bent down to the ground on one knee. He opened what he was holding, revealing a ring. "Is that you'll be mine. Will you marry me, (F/N)?" All you could do was Smile as a tear ran down your face.

Armin slipped the ring on your finger and stood up. You nodded your head furiously, not able to find any words at the moment. But a nod was good enough for her fiance, she knew how much you love him.

Later again...

Even our men were laying in bed together, sleeping. You suddenly snapped out of your sleep and Sugarman awake. He rubbed his face then looked at you. Your face was bright and cheery. You wrapped your arms around him. "Yes, Armin! Yes!" You squealed and he just nodded laying back down with you in his arms. Finally, you could be his forever.

Bonus part

You ran into your father's office when you finally have free time. He smiled at seeing your face. He knew what was up, but was letting you explain for yourself. You held up your hand and put into your new ring.

"Dad! Armin proposed!" He quickly for your arms around your father. He smiled at you.

"I know. He came in the other day and asked for my blessing." You continued to smile. "Now, who's a good matchmaked?" He said with a smirk.

"You are..." You said and rolled your eyes.