Zero Moon by Caja Mackenzie

Fast-tracked from Earth, an ambitious Administrator from an aggressive Terran corporation arrives at the female-only deep-space mining colony: Zero Moon.
When twenty-seven year old Georgia Venezuela is given the grand tour of the colony by the current administrator, she is surprised and excited to discover the perks of her position, including a private shuttle, and a harem of three male pleasure models.
But when Georgia falls in love with M192, she quickly discovers that the innocent pleasure model is scheduled for retirement to the “deep pit” for one-on-one combat, providing one last round of entertainment for the Zero Moon miners.
In the black expanse of deep space, at the very core of a meteor mine, Georgia must choose between the slave she loves, and the wrath of the corporation pulling all the strings, and cutting off every chance for escape.