What metaphors are used in Say Yes by Tobias Wolff?

As the husband waits in their bed for his wife to come, he hears her moving across the room and suddenly his "heart pounded the way it had on their first night together." This sexual memory is then surrounded with fear and alarm and even a threat to personal safety, as the husband further extends the metaphor, comparing the beating of his heart to the way it pounded "when he woke at a noise in the darkness and waited to hear it again—the sound of someone moving through the house, a stranger."