Here's why:
* A's internal conflict: Throughout the novel, A struggles with the desire to find a permanent body and be with Rhiannon. This is fueled by the loneliness and frustration of constantly inhabiting different bodies.
* The stakes: A's decision to stay in Justin's body means giving up the potential for a new life and a new beginning. It also represents a choice to be with Rhiannon, even though it might not be a "normal" relationship.
* The impact on Rhiannon: This decision forces Rhiannon to confront the true nature of their relationship, which is unconventional and deeply challenging. It also requires her to accept that A, in all their complexities, is the only one who can make her truly happy.
* Shifting dynamics: The climax marks a significant shift in the power dynamic between A and Rhiannon. A chooses to stay, relinquishing their freedom to explore different lives, while Rhiannon is forced to adapt to the new reality of their relationship.
It's important to note that the climax is not a single, dramatic event, but rather a culmination of A's internal struggles and a crucial turning point in their relationship with Rhiannon. This decision sets the stage for the final resolution of the novel, where A and Rhiannon learn to navigate their unique and unconventional love.