Inexperienced succubus Saki tries her best to make her first harvest a special occasion, but it goes so wrong that Renta's left with side effects downstairs! Good thing Saki's big sister is a doctor. But Yumeka takes no half measures—she wants to cure Renta of his virginity as well as his symptoms! Is Renta a donor that Saki can truly love? Which succubus sister will have her hunger sated at last? Find out in this story's sweet, sexy climax!