The day we became friends

Flash and I became best friends today - I'm not sure why or how it happened so suddenly, but I now have a little Flash shaped shadow following me constantly! Unfortunately Snowflake and Titchy aren't huge Flash fans... they either won't come in at all or Snowflake comes in and hisses and tries to beat him up before running off. I'm not sure what I'm going to do. The strangest thing is that Flash found the litter tray in the spare room bathroom today and used it! He's always gone outside before , and I've never shown him it's there... how did he know what it was for?!