Idea from @SquadLeaderChase
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Eren: let me get this straight...
Eren: Levi has boobs now?
Levi: I can still hear you.
Armin: How come all of the females in the Scouting Legion are so violent?
Levi: Armin once again I am perfectly capable of hearing.
Jean: I don't know maybe because they're always bleeding they're on their periods...?
Levi: Jean I'm- ewe no- RIGHT HERE
Hanji: Okay maybe that last experiment went to well...
Eren: WHAT DID YOU DO?!
Hanji: I wanted to see if Levi was more bitchy if he was on his period, so yeah, but it turned him into a girl instead of just giving him his menstrual period...
Levi: Well that didnt- WAIT WHAT