"No I'm not! I-I'm not-" Katsuki gets cut off by you scratching behind his ear, he let's out a surprised noise but a cute noise. You kept calling him cute and he got really embarrassed, he blushed a lot and kept saying that he wasn't cute. "S-stop scratching behind my ear... It's weird..." He keeps blushing furiously while you continue to scratch behind his ear, his tail caressing your leg accidentally.