(In this story your her brother)

After yours sister died Ei geted depressed and you helped her to get better by cuddling her kissing cheek cooking her meals enyting to make her happy... But she gets a little bit too overprotective and clingy whit you and she always says

Ei:My little-tingy brother.. I love you...

(By the way she got crazy over you because she is scared of losing you too... Good to luck to survive)