After Shinra took a break from work on the Celsius, you were asked to help the Gullwings with their various repairs on their airship, and you happen to run into Rikku in their bar area, who then offers to get to know you better as thanks for your work with them.
Guess I'm doing all of them now x3
Same scenario as Yuna but tweaked a bit, Shinra is off on vacation so you take the Gullwings role of brains for a few days in their Airship, the Celsius.
From Final Fantasy X2
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