Bond of Brothers by R.E. Butler.
Wiccan-Were-Bear Series. Book 4#
Fairy Shaylee saves a dying were-bear, kindling a red-hot love affair between the two. But a brother's love threatens their happiness. Can she bridge the gap between them or will choosing both be the end of it all? This story contains a pissed off fairy, a were-bear that doesn’t want to share, over-protective mates, a sacrifice of blood and flesh that will melt your heart, and m/f/m interaction.