Levi Rivaille is a young and promising Captain in the Survey Corps, and though he hasn't been a Captain for long, he's already earned the title 'Humanity's Best Soldier'. He rose quickly in the ranks, his only goal being humanity's survival and the extinction of the Titans. On a call one day, with his squad, he discovers Dr. Jaeger and his wife, murdered, right in front of their toddler son, Eren. He takes care of the young boy, until the Military Police find somewhere to place him. But as he grows close to the little boy, he realizes something. He wouldn't give Eren up for anything.

A captain named Levi who doesn't believe in mermans but then when he falls off his ship sinking his vision becomes blurry as he slightly sees a mermaid...no an merman who saves his life but Instead of Levi letting him leave he captured him and gave him to hanji to experiment on this merman. Problem is he won't talk won't listen and won't move from where he is how can hanji experiment on him ??? And how will they sell this merman? What will the mermans family do? A war!?!? Will he die!?! Will captain Levi fall in love with this thing!! Read to find out!?!? (LOL SORRY A REALLY DUMB DESCRIPTION. BUT READ IT U WILL FIND THIS STORY VERY AMUSING AMD GREAT EVEN KINKY -wink wink-

Yes, I am Levi Ackerman. A Mafia boss. People feared me from the moment they hear my name. Whoever messes up with me will meet their death. I am strong, heartless, and cold as ice like my family, my men, and what society expected me to be. But they all forgot. I am an Omega. Is it bad to act like one? Levi was invited to Hange's and Moblit's wedding. He was starting to grow jealous of Hange for getting married before him. Heck, his jealous of every Omega on the planet that was happily living their lives like a normal Omega but he never voices his jealousy. He had to stay strong to maintain the Ackerman name, be the person that his comrades respect and feared. Because of his name and status, there's a slim chance of being a normal Omega or getting a date.... until a mismatch-eyed wedding singer appears. (First posted on AO3 @ zerozaki_Zen)

(Suggest reading this book last it's really bad) Eren a 23 year old young man who soon meets a rather short but handsome man only two years older than him, not having any interest in him at first he soon learns the feelings he has for the man

In order to prevent any type of crimes towards the omegas and the harmful effects of suppressants, the government established an omega sanctuary where all omegas are kept and never allowed to go outside the walls. However, they can only be freed by they own mates. Even when "rescued" from his own uncle who owns an illegal pit fight and isolated Levi ever since he was born, Levi hardly felt freedom. He can finally see the outside world but the damn walls always stopped him. He needed to escape but who needs escaping when you have a mate that can take you out? (First posted on AO3 @ zerozaki_Zen) NOTE: CURRENTLY EDITING!

Have you ever fallen in love with your best friend's brother? Well that's what happened with Eren. Junior year is finished, it's summer vacation, and the friendship between Eren and Mikasa has been unbreakable. However, when Mikasa's older brother returns from college...Eren cannot keep his eyes off him. Now the only secret he tries to keep from Mikasa...Is that he and her older brother, Levi, fool around behind her back.

Eren Jaeger suddenly transformed into a little kid. Levi Ackerman was a father since he had more experience with children (his everyday life with Hanji and the others). Also, he was assigned to the title as a "farther". Hope you enjoy the story!

While on fight to save humanity, from the titans, Captain Levi and eren get closer as those around them die, Levi is worried that eren could die as well, or something could go wrong while he's transforming and get hurt. They made a promise not to die, but will that promise be enough?

Eren is a omega and is kept trapped in a basement for six years. One day his pack is attacked by rogues,using this chance to escape,Eren fled. He stumbles onto another packs territory called "Wings of Freedom". Levi is the alpha of the Wings of Freedom pack who hasn't found his mate yet. When a omega steps onto his territory he learns that he us his mate. Will he accept it him? Or will he reject him?

Mermaid!ErenxPirate!Levi eren is a mermaid in a migrating pod with his family, but when pirates come to get one for research, Eren is the one who get caught!