Eren, Armin, Hanji, Jean, and Sasha Make a bet to see who can seduce The corporal. The winner takes all. Short story about Rivamika

A few years after mikasas parents were killed she finds a letter saying that they weren't her parents they adopted her. In the letter it says were her father is but no his name, also that they adopted her because her real mother was killed. She then try's to find her real father, who is in the survey corps