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In order to take the entrance exam, I had to go to Tokyo and stay at my brother's house. When I got to the house, my brother was nowhere to be found, and Hikari's sister-in-law came to greet me by herself. She's always cheerful and kind, and she's too beautiful for an older brother...I've secretly admired her since the first time I met her. Apparently, my brother is on a business trip for a week, so I'm alone with my sister-in-law... My sister-in-law's big breasts became even more beautiful due to the high level of exposure, and I, a virgin, couldn't help but study her defenseless appearance... Then, when my sister-in-law said, ``This is just a rehearsal for when I get a girlfriend,'' I reached the limit of my patience and finally... Mouth ejaculation, creampie, facial cumshot... 7 shots in total. A 150-minute story written by Princess Hikari, who has a bewitching atmosphere and is sexy.