A rather plain looking young woman gets the interest of an older man who cooperates to see what she is up to. It's what he gets "up to" that really gets interesting.
The 16yr old daughter of 42yr old GF wants sex. She picks on me, one of her mother's lovers, to learn from. I wasn't sure if I was blessed or not but I sure would find out.
Adam is of a species with many workers, a small group of breeding females, and a single male to bind them all chemically and to impregnate them: him. When his own daughters reach puberty, he must move on to avoid harmful inbreeding. His first new assignment has a lurking moral problem, and the next one is as a "contract" king bee.