My Sister Is a Dragon

"Hey! I told you to spit out the bones when eating chicken drumsticks!" Luo Lei looked at his little sister eating and really wanted to crush her to death... "As a noble dragon, my brother must eat like me, otherwise how will he change back to his original appearance!" --------------------------------------------------------------- After time traveling, Luo Lei has the dual identity of a dragon and a human prince, so the question arises, how can a human with a dragon tail change back to his original appearance?