Savage. Savage, #1

The government promised that the asteroid that was set to hit the Earth wasn't anything to worry about. They lied. After the world is brought to a halt when the asteroid strikes Earth, Ilah is left to pick up any pieces she can find. Caring for her father, who is dying of cancer, had been her whole world; she never thought she would have to face life with the added pressure of people becoming animals and killing each other.
In her desperation to find a new normal, she finds four men who save her and help make her world right again. This is a slow burn, why-choose book suited to 18+. Themes may affect people who are sensitive to violence.