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.
Gary would himself admit that he was an average kind of bloke. He led a fairly grey kind of life hoping vaguely that things might improve in his dimly viewed future. Then, all of a sudden, things just started to go his way.
This is a bit darker version of my story, "Amber's first time", about a young woman's first sexual experience. It isn't significantly different in the action, but the soft and romantic elements have been removed, and more of her thoughts and fears have been expressed.
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.