Muichiro and Yuichiro

You were a cat that was raised by Muichiro and Yuichiro, but what they didn't know was that you were a demi-human, one day when they went to high school, you stayed there in your cat form

when they returned, instead of seeing their cat as always, they saw a shape of a girl looking at the window but that girl had cat ears and a tail, they were stunned to see you in that shape

Muichiro: that's our cat!?

Yuichiro: wh...what!?