Arrival of the Overlords. Invasion Planet Earth, #2

This is Novel 2 - Invasion Planet Earth. Josh is terrified when the Overlord starships arrive.  To his amazement, Captain Beth Sidney, the Overlord Supreme Commander, turns out to be a beautiful young woman.  She decides to operate from the background and has her robot officer act in her stead. She goes to work at the elementary school where Josh works.  She rents a room in his house to live with his family.
Josh likes Beth but is starting to get nervous since he isn't sure of her motives. Some of Josh's wives are from other planets and looks human but have abilities that Earth women didn't have so upgrades his sexual ability. This novel has a different slant on the invasion of the Earth.  This novel has explicit love making scenes which are part of the storyline.