You are a citizen of the Aztec Empire and your stolen something from the Queen. So you will be punished for your crime so they would cut you finger and the Queen will cut her and a drop of the Queen blood so you go through a different kind of punishment the punishment of becoming the most beautiful Aztec woman ever

Aztec Queen: you shall be punished for your actions!

She cut your and her finger and drops her body to your and your begin to transform