Ashida was invited by Miwa, his girlfriend, to come over to their house. As soon as he entered the house, he encountered a stunningly beautiful girl in lingerie admiring herself in the mirror!!! It turned out to be Hiyori, Miwa's older sister, a lingerie model. From the very first meeting, Ashida felt that Hiyori had some intentions towards him, with her seductive gaze, intentionally revealing her provocative lingerie. Especially when Ashida and Miwa were having sex, Hiyori stood at the door, watching, performing seductive gestures that made him unable to resist and ejaculate immediately! After finishing with his girlfriend, Ashida went to the bathroom and met Hiyori waiting there. Using her soft, exquisite body, Hiyori rubbed against him, making him extremely horny and quickly erect. Hiyori helped Ashida with a blowjob to ease his arousal, he couldn't hold on much longer and quickly ejaculated. And from then on, the two started this secret relationship with each other. In particular, they enjoyed having sex discreetly right next to Miwa!!! While his girlfriend was studying in the room, in the bathroom, in the living room, or sleeping right beside her... The feeling of having sex with his girlfriend's sister right next to her made Ashida extremely excited. It was even more pleasurable when he could have sex bare and ejaculate freely inside her!!! Something his girlfriend had never allowed him to do!!!