The Meaning of Vengeance (Naughty or Nice) by Jamie Fessenden

In the world of medieval Iceland, family loyalty and complex codes of revenge are everything. When nineteen-year-old Geirr attempts to seek vengeance against Ari Thorgillsson for the death of his older brother, he is nearly killed himself. But Ari has grown tired of the feud that has devastated their families, and he nurses Geirr back to health. The two reach out tentatively to one another, attempting to bridge fifteen years of hatred and death with a bond of friendship. But trust doesn’t come easily to either man, and friendship may not be enough when it comes to a choice between love and duty.