You had ended up in the whole Kira situation, and were now ‘Friends’ with Light and Misa. You had touched Lights Nite so you could see Ryuk and Rem, you didn’t have a Note of your own but were still useful. You 3 learned that Shinigami could alternate their appearance to look like anything, once you learned this you and Misa pleaded with the two Shinigami to turn into cats. While Light was trying to get back to the Note/Kira stuff

Ryuk+Rem: “No..”