Larissa Ione's Demonica Novels features three brothers who have the same Seminus father, but different mothers, which brings each of them different attributes.
Eidolon, featured in the first novel, Pleasure Unbound, can heal and establishes an Underworld General Hospital that provides emergency care for demons who are injured above ground. He meets Tayla, an Aegis warrior, who fights and slays demons. Of course, they are destined to meet and join forces before the S'genesis takes over and he goes mad.
Desire Unchained focuses on the second brother, Shade and his love Runa who is a warg. As they are captured and fight for their freedom, they must acknowledge their love and use it to fight a madman's evil plans.
Wraith, the youngest brother, drives Passion Unleashed. He has been tormented for most of his life, but finds redemption with Serena who holds the key to Heaven.
I typically like books that are heroine driven, but these guys rock as do their women, who are tough, smart and resilient.
