The Siren's Call (Gravity Falls BillDip Fanfic)

Have you ever heard of the deep, blue Gravity Seas? It's not on any maps, and most people have never heard of it. Some people think it's a myth. But if you're curious, don't wait. Tales of mystery and adventure lure into the ocean that none will dare to step into, except for one pirate crew: The Nightmare Dwellers. Le...