In episode 21 of soul eater Maka has to go into the Devil Sword users soul and because her soul is represented by her younger self and So it's ar for 2 girls though no process sorry.
http://www.onemanga.com/Soul_Eater/19/21/
http://www.onemanga.com/Soul_Eater/19/22-23/
http://www.onemanga.com/Soul_Eater/19/36/
Notice those pagers are not in order because something else happesns in between 23 and 36