WillyMilly (1986)

Milly is annoyed whenever her mom tells her to behave more appropriate for a girl Shes just not interested in fancy dresses or prom dances Some day her best friends little brother offers her a potion which can make her deepest wish come true during a solar eclipse She goes through with it and ends up with male genitals additionally So she has to decide if she wants to life as boy or girl Her father who always wanted a son supports her in checking out life as a boy Hence Milly changes school and starts out as Willy