Steve is surprised/shocked! The two girls he’s dating are sisters! A threesome forms then a third sister joins. Friends arrive causing additional loving and sexual relationships. He hides nothing as his sphere expands. He involves guy friends to help out with his ‘harem’. A wedding and highly sexual five-day ‘reception’ cap off the story, along with the perfect living situation.
What do you do when the last fertile male in the family tree is going off to war? You try to ensure that the line goes on, of course. Brilliant minds work alike, and in this family there are a LOT of brilliant minds.