H2O: Just Add Water and Gravity Falls Crossovers
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Gravity Falls: Just add water by Mysticalanimallover reviews
This is a story of three friends who get turned into merpeople.
Rated: T - English - Supernatural/Adventure - Chapters: 1 - Words: 279 - Reviews: 6 - Favs: 5 - Follows: 4 - Published: 6/12/2013 - Dipper P., Mabel P., Wendy