How to use "familiarity" in a sentence

As he drew near, he opened his arms, as if it was the most natural thing in the world for him to hold and comfort her, as if he had held her many times before, and she leaned against him in the same spirit of familiarity

Gradually, however, as she and Elliot went through the standard rites of courtship, the indirect sexual thrusts and parries of a budding relationship, albeit at an accelerated pace, the familiarity of the games reassured her