Fics like The Mechanics of Love

Loosely based on the manga Absolute Boyfriend. Dean is less than amused when, for his birthday, Gabriel signs him up for a month-long trial with Castiel, a humanoid robot prototype developed by Heaven Technologies to be the perfect boyfriend. At first, Dean is not thrilled at the new addition to his household, but as he spends more time with the robot, Dean finds himself slowly falling in love.

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