The fact that they have an intimate physical relationship and visit each other's parents on holidays illustrates the integrating stage.
The integrating stage in a relationship simply means the stage where two people truly become a couple. At this stage, the couples are letting people know that they are dating.
Therefore, since Sarah and Heather have an intimate physical relationship, visit each other's parents on holiday, bought a car and signed a lease on a new apartment together, they're in the integrating stage.
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