A/N: So I wanted to see if I could manage something that was exactly 100 words. And I did! Written for my absolutely fantastic beta RoxieFlash, because everything I post would be about a thousand words shorter without her.
"How do humans go about it, then?"
"Dunno, rings and a ceremony?"
"Don't much care for ceremonies."
"That makes two of us."
But the next time they stop by Earth for milk, she comes back with their lunch tray to find his sonic screwdriver disassembled on the table. She munches on vinegard chips as he puts it back together—slowly, deliberately re-ordering the pieces.
Upon reactivation, it looks a little shorter, glows a little greener, hums a little softer. Then he picks up the short cylindrical piece he's removed—functional, utilitarian, precious—and without speaking slips it on her finger.