You thought about yourself and what he could do with his body. You thought about changing into a woman but felt something would be missing if he became a full woman and the remembered seeing pics of shemales and futas and decided to become a shemale. You had it so you willed yourself to keep your memories of being a male as you get the memories of being a shemale and their was not a lot of change to how people had interacted with you. You willed his body to start changing and it began to to become feminine as breasts grew on his/her chest to a c-cup size and your hair grew to mid-back. You changed his hair color to blue as well.
You looked at yourself and it felt right to her now. You looked around and saw Kat and remembered how she looked as a cat girl and willed her to become one again and then entered her mind and started bending her to your will and made her a slave for you to use however she feels fit. You also made it so Kat can transform into a anthro form to fight if needed to. You ordered Kat to come with her as she left the school and headed home.