Attack on Titan Fanfic

When a Comet comes crashing down outside the city's walls, a strange man walks out from it and is lost on where he is. As the scouts find him and take him in for questions, he speaks a totally different language until he sees the faces of confusion. The only way he can learn a new language is by touch or a kiss. Levi comes in to see what is going on and sees Olexa trying to touch someone so he can communicate back. As he reaches for Levi, Levi hits him. Olexa knew he wouldn't get through the language barrier this way and spoke to his AI and got her to regulate the speech and then he to talk so the people could understand him. He learns where he is and the threats that face the city and tells the people he will help and falls for Levi