The Marilians - The Earth's Angels Trilogy Adult Versions., #2

Her determination will save humanity. Her power will save the universe. Melanie is shocked to discover her unborn baby has wings and extraordinary powers. But that doesn't stop her from joining the fight against the blood-thirsty Marilians. When they discover a Marilian scout hiding near the human's quarters, Mel realizes the invasion is imminent. This means all the surviving humans must train and prepare for battle.
Including her husband and four children. But there's no choice if they hope to stop the alien invasion. As the angels and human survivors train for the battle of a lifetime, Mel wonders about the child growing inside her, a child like no other in the universe. Amid their hectic preparations, friendships build between not only survivors but also humans and angels. Unconventional love forms between races while facing a tragic loss.
However, there is no time to grieve. Meanwhile, Earth's angels make their own plans when they summon both their elders and an ancient alien race of dragons to help defend Earth. Angels, dragons, and humans fight for Earth and the survival of humankind in a war where aliens control fire, and their bite or scratch transforms any lifeform into one of them.