At My Alien Boss’s Service by N. R. Star

Ashley fantasizes about Marcus all the time. This sexy older man isn’t just attractive. He’s also been a big influence on her life. She’s the overnight manager at his hotel, and that lets her do all of her college studies. He even lets her have the manager apartment there because she can’t afford the dorms. She’s had a crush on him for a long time and it only gets stronger when two men try to rob the place and Marcus defends her in ways that seem impossible.
Those ways would be impossible for a normal human being. Marcus isn’t a normal human being, though. He’s an alien who has escaped from Varis, a dying planet. There are a few hundred Varisians on Earth and they’re facing extinction unless they can have young. The survival of the Varisian race is dependent on human women, and it becomes the duty of every Varisian man to find a concubine who will bear young.
And Marcus just saved a very beautiful, very nubile, very fertile young woman from two thugs.
But Marcus can’t think of her as nothing more than a womb. She’s not the only one who has fantasized about a relationship. He knows he can’t put a baby inside of her until he tells her everything. But if she knows the truth, will she still want him?