This is the epilogue to A Civil Campaign, Miles and Ekaterin's wedding (including some last minute assassination plot) told from Armsman Roic's point of view.
Roic isn't your usual ImpSec trained armsman. He was a policeman in the Vorkosigan district capital and some heroism brought him to the attention of senior armsman Pym who recruited him. Then he "extinguished" himself in the bug butter disaster, and since then suffers from some kind of minority complex. Now he gets to meet Miles's galactic acquaintances when his Dendarii Mercenary companions join the wedding party - and is confronted with Taura, the bio-engineered super soldier Miles rescued from Jackson's Whole.
It's the little things that make this short story memorable: Taura's wariness concerning Ekaterin, absent Quinn's ambiguous wedding present - and Taura's agonizing over whether Quinn would actually hurt Miles (and Ekaterin). And there's of course the innate fear of mutants that hamper Roic's initial interaction with Taura, and Miles's desperate attempt to make her comfortable.
But the moments I enjoy most are the little glimpses again into the Vorkosigan family and friends. Gregor's attending Miles's wedding, Ivan getting admonished by Aral not to screw things up (only to leave some kind of obscene sculpture in the garden). This outside view again sums up nicely what's been shown so far in the series.
Overall, an enjoyable short story.