Don't You Try To Climb It

Not the pleasantest of stories ahead, just keep that in mind.

The adamant girl makes her way,
The boy follows at her side,
An allegiance he'll always stay,
They see the tree stood with elegance, pride,
A warning against tampering or climbing engraved,
It's crudely carved, but she ignores, foolishly brave,
She climbs first up so dangerously high,
He's following her lead, ever so near by,
But who follows behind him?
Who's climbing, decided not on whim?
The two children make way toward,
They've not noticed another on board,
They climb each branch taking care of foot,
Hand on yet another branch is put,
But someone- something
Is following,
Following the children so young,
Taking the branches rung by rung,
Stalking its prey, laughing inside,
Not a whisper or sign of it implied,
But then
They stop when
The creature starts scratching upon the branch below,
A twisted sign with claws he does draw,
One of a dead corpse lying
Against the tree bark crying.

A few days late a gardener ventures past,
Coming past the tree dead last,
Sardonically ironic notifying the sight,
He nearly spurts sick, scared for life,
He sees two lifeless children lying,
Against the tree bark crying.