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You me into a house until

They tire, I'm in for the kill

The mood and I'm them all to tears,

And in the world I'm up, my peers

Are left behind as rules unfair for most;

I the goalpost.

'Don't me into the house!'
'What?'
'I prefer the outside, and more than anywhere else, I much prefer up a tree.'

Riddle Answer A Move

Riddle Explanation
you me into a house - to move into a house.

until they tire, I'm in for the kill - to move in for the kill.

kill the mood and I'm them all to tears - to move someone to tears.

and in the world I'm up, my peers are left behind - to move up in the world.

my peers are left behind as rules unfair for most; I the goalpost - to move the goalposts, or to change the rules in an unfair manner.