You had recently created a giant magical rock. This allowed When two people touched the stone at the same time, they changed bodies.

One day you decided to take it to the UA since there was no one who could watch it while you were not there, Upon entering the Hall, Bakugo looks at you and smiles mockingly.

"What's that, extra?"

asked the Blonde as he approached, however Katsuki accidentally touched him, causing both of them to exchange bodies.