Fics like (Ship of the Line) Forever After Earth

YAHF. To get Willow to wear a more daring costume, Buffy and Xander agree to go in the same costume Willow does. Buffy picks a set of matching costumes that are something called FAE... When the spell wears off, Buffy, Xander, and Willow are left with new bodies, life-changing memories, and a city-sized starship. Hijinks Ensue.

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