I reread this today for the 3rd or 4th time while I was giving my students an exam. It was the perfect length for it, not to mention suitably bleak and angsty (but with an HEA).
I make no secret over loving a good hurt/comfort story, and this one delivers. The MC is a prisoner, broken in spirit, mind, and body. Through the small details, Martinez does an excellent job of depicting the pain and bleakness of his life. But then a tiny bit of hope shines in, in the form of one of his guards. Small crumbs of kindness go a long way and the relationship between them develops realistically.
Also, it’s sci-fi, and there’s not enough of that in m/m romance. Oh, and it’s free: http://www.mmromancegroup.com/prisoner-374215-by-angel-martinez/