But it's outside yet can only be within existing tenements...that is one of the clauses....and as Phil pointed out above...it's a nonsense statement because mutual consent effectively means there is no current legal agreement. It would require a new agreement (that is what mutual consent means) and u can bet your bottom dollar that if that was to occur then there would be a new legal agreement covering that mutually agreed deal.
The statement effectively says, "if we still like each other in the morning we reserve the right but not the obligation to jump back into bed again". Means nothing legally.