Mogsie will not be happy, I've just seen the lighter Naughty Twin go right up to his tree, and it is his tree we all know that, and spray her calling card all over it. What on earth is she playing at it's been his favourite resting place since the day he moved in, well actually before he moved in, he claimed the spot the first time I ever saw him.
This is a travesty, it's an un-written rule amongst all the cats of the world that you never move in on another cats territory, unless of course loves involved and then it seems to be a bit of a free-for-all.