A Prince's Birthday

A BillDip/Gravity Falls Royalty AU! It's prince William's 21st birthday, and he's just received a very unusual gift; a captured slave boy named Dipper. Will he return him home? Or will he keep him for himself? Rated T for mild language and adult themes, but nothing graphic. Tags: Gravity Falls, BillDip, Bipper, Bill Cipher, Dipper Pines, BillxDipper, Bill x Dipper.