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The Promise of Shell and Clam by CieloFiore-hime reviews
The Vongola primo and Conchiglia primo made a promise and now it passes on to their descendents.
Crossover - Katekyo Hitman Reborn! & Uta no Prince-sama - Rated: T - English - Family/Friendship - Chapters: 4 - Words: 3,020 - Reviews: 15 - Favs: 16 - Follows: 18 - Updated: 9/15/2013 - Published: 1/28/2013 - Vongola 10th Generation