Brandy (http://archiveofourown.org/works/3329144)by dreamweaver37 (Sam/Gabriel). Plenty of angst, but the ending is totally worth it.

Summary: Gabriel was a rarity for his time; an independent bearer who lived by his own rules, and didn't bow to anyone's expectations. When he meets the sailor of his dreams, Sam sweeps him off his feet, and teaches him how deeply love can run, and how wrenching loss can be.
For a brief time, Gabriel had everything. How does he live without it when it's snatched away?