In the book "Obsidian" by Jennifer L. Armentrout, the characters explore their physical relationship, indicating that intimate encounters can be quite energy-consuming. This reflects a blend of humor and realism in their interactions, where sexuality is presented as both a natural part of life and a source of exhaustion.

The quote highlights the characters' awareness of the energy dynamics involved in physical intimacy. It suggests that while engaging in such activities can be fun and passionate, they also require a certain level of vitality, adding depth to the romantic tension in the story.