Depending on the canon, Yukari is quite abusive to Ran. Seeing her master get treated like this does not make Chen very happy
Thank you. I'll wash and return it, ok?Hee hee! Please, take this and wipe away your sweat!Ha ha, you don't need to go to the trouble of washing it!How unbecoming of me! I really went all-out in that snowball fight, heh.
I don't need it anymore. Keep it.
Thank you, I'll wash it an--And for you, too, Yukari-sama.