Rikka's mother is preparing to remarry, her new stepfather is very kind and mature. Seeing her mother so happy also makes Rikka feel happy for her. But witnessing the stepfather's skillful hip shaking ability, Rikka's inner desire awakens. Despite feeling guilty towards her mother, she cannot control herself. Pretending to be bitten by a mosquito to ask her stepfather to apply medicine for her, and the bite was right in the middle of her buttocks, she had to pull down her underwear to see it. Nevertheless, her stepfather remained composed and quickly left. Can he withstand it once, but what about twice? Rikka often wears short skirts to show off her full buttocks with cute little T-back panties. She deliberately spills tea to bend down under the table, deliberately letting her stepfather admire her provocatively swaying buttocks. And Rikka won! That night, unable to resist any longer, the stepfather sneaked into Rikka's room. Of course, Rikka had been waiting for her stepfather all this time. Although she knew this was wrong, Rikka's sexual desire surpassed the feeling of guilt towards her mother. Whenever her mother was away, they both would passionately engage in each other, enjoying the pleasure that sex brings...