Levi: Drinking tea while cuddling and watching a movie/talking/etc. with you.
Eren: Doing anything competitive with you.
Armin: Deep conversations and snuggles.
Jean: The activity doesn't matter much as long as the both of you can banter.
Erwin: Playing strategy games with you.
Reiner: Having dinner in a romantic spot he set up.
Hanji: Joking around, talking about theories, sharing your thoughts on different things, etc.
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Attack on Titan Preferences
FanficPreferences for Levi, Eren, Armin, Jean, Erwin, Reiner, and Hanji.