Father Figure

The art teacher bites down a smile, busying himself with collecting the drawing instruments back into the pencil bag and pretending he hadn't heard. He knows the drill; this isn't the first time a student has accidentally slipped up and called him their father. He's been teaching for twenty years now.

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...One by one, the students of Dupont's Art Club start calling Mr. Carracci their father.

(Or: A family can be an art teacher and his six students.)