Their Past has been brought since Giaints have been destroying their town,Wall of maria have been destroyed,Eren was fully aware of his history,Mikasa was adopted into eren's family since notices Eren has been acting weird lately. She approached Eren and ask what's is wrong with him.
Nee,Eren?is their something wrong,mikasa asked eren. Eren was looking at the clouds and he answered "Mikasa..if only mom and dad were alive..we would be a happy family..but happy endings only end in fairy tales right?He looked at was paying attention to what he have said and she told him "w-why did you brought it now?it's true..b-but..we have friends with us to support us like Armin and the others..but if mom and dad was here..it would nice right?",Eren sits down near the tree and she told her "back then..when were child..everything was going to be fine?..those giants ruined everything!i-i will kill every each of them!Humanity will survive! -His eyes are pierce like a sword- Mikasa was shocked "Eren! we will! Humanity will survive with your power and with every-one too! i am sure of it!, Eren agreed "hmm..true but this key..in my neck..basement..*puts hands on my head*..my past was all blurry..,Mikasa "Don't worry eren! what ever happens we will protect you! Eren "Don't worry,we won't die that easily!"...
Mikasa "e-eren..what is this complicated feeling...my heart beats faster when i am around you...
Eren "EHH!?..mikasa..are you..what do you call that..*thinks for minute*
Mikasa "d-d-do you mean..i have feelings for you not as a family..b-but something else..
Eren "wakaranai..i don't understand you at all..."
Mikasa "me neither..don't mind me at all"
Mikasa doesn't know that her feelings for him as family doesn't change..but there was something else..that bothers her a lot but she doesn't understand it.