A carefree son is summoned home after dad gets wind of his grades. He falls for his servant, who has crushed on him for ages.
His dad's story: Twenty years after brothers-in-law-to-be fell in love and risked a forbidden affair, they have a chance to be together.
Too short, but I would read a hundred chapters about the dad. Both story lines are entertaining, but the dad's -- finally being with the person you've loved for two decades -- really touched me. Honestly, I reread the dad's three chapters probably once a month. That's why this gets five stars. It really resonated, despite not being long or developed. I'd write a novel based on the concept of waiting twenty years to be with the person you loved.
Houtou Musuko to Sewagakari