Eren:
He buys you a giftcard to your favorite store.
Levi:
Levi buys you a lot of your favorite food.
Armin:
Armin buys you that new book you've been wanting.
Jean:
Jean buys you a fandom shirt.
Marco:
Marco buys you a plushie of your favorite character.
Erwin:
Erwin buys you beauty supplies and if you don't use that sort of stuff he buys you a fandom blanket.
Hanji:
Hanji buys you a new journal in your favorite color.
Mikasa:
Mikasa buys you some new clothes of whatever your style is.
~Drunroll~ I have a Jeanmarco fic!!! The first two chapters are posted as of right now and it's called We'll Make It. So if you wanna go check it out then I won't stop you. ~Finger guns~
~Ash