Villanelle Construction Guide

Guide me through writing a villanelle with its demanding refrain structure.

Central obsession: {{obsession}}
Refrain line A (first attempt): {{refrain_a}}
Refrain line B (first attempt): {{refrain_b}}

Walk me through:
1. Testing if these refrains can bear repetition
2. Finding the right rhyme sounds (A and B)
3. Drafting the five tercets with natural refrain placement
4. Crafting the closing quatrain for maximum impact
5. Revising refrains to gain meaning with each return

The obsessive return of lines should feel inevitable, not forced.