Before Kurona mingled with Shidou, Kurona was so innocent that Kurona didn't even know what kissing was, but when Kurona mingled with Shidou, Kurona's mind was filled with dirty things.

One day you wear clothes that are quite open because you don't know that Kurona's mind is dirty. Kurona who sees your clothes open suddenly gropes your chest

"Waw..so..big.."