He waits till you fall in love with him, adopt him, care for him, would do anything for him. Right then, he dies and with him you die of a broken heart
You can see the seething hatred in that little assholes eyes. He'll try....no, he WILL kill you. You just dont know when or how, but its coming, and it will be slow and painful.
"the same thing we do every night... try to take over the world!"