In "The Mermaids Singing" by Val McDermid, a character reassures another by suggesting that they should switch roles for the night, allowing the other person to take charge while they willingly submit. This playful banter highlights themes of trust and power dynamics in relationships, where one person humorously offers to let the other take control.

Merrick reflects on the interaction, assessing how it illustrates a confidence in their current dynamic. The exchange signifies a deeper understanding of their relationship, showcasing how they navigate power and vulnerability. It adds a layer of complexity to their character development and mutual respect.