They become reluctant partners.
Natasha, because no one trusts her.
And Clint because he has to babysit and vet the target he refused to kill.
But it turns out that the Director made a spectacular pair.
They click naturally in the field.
Natasha learns to trust Clint.
That he will have her back.
And not stab it.
Clint learns to work with a partner.
He used to work solo before.
They become best friends.
And their experiences in the field only deepen their friendship.
Over the years, they fall in love.
They try to deny it but the pull is too strong.
They just decide to be together.
After almost losing each other.