Oh we wish they would become house cats!!
They won't let us touch them, we've managed to grab them a few times and pick them up, and give them a smoothe, but they don't like it.
But they are so sweet about it, and are NEVER agressive not in the slightest.
We leave the window open and they sometimes sit on the inside windowsill but always go back out if we get too close
But we love them!