Сэм превратился в кошку - Care and Feeding:

The cat tipped its head back and looked up. “Sam, is that you?” There was a moment, and then the cat nodded slowly, up and down. A clear gesture. “Sam, you cut that out right now. It’s not funny.”

И винцестный сиквел к нему - For Keeps, который я сейчас как раз читаю )))))))))