Possible Vocation?

This mischievous look might cause you to wonder what on earth Koji is doing to poor little Izumi's face?!
Let the aerial view set you at ease. He's brushing her teeth. Fine with me! It needs to be done but it's not usually a pleasant job, so I don't mind passing it off when the opportunity arises.
He's very thorough, he even makes her rinse at the end. Pherhaps he was inspired by our recent trip to the dentist?