During the summer vacation, I went back to my hometown. My sister-in-law Kana welcomed me... Her mature smile and the panty line clearly visible through her maxi dress caught my eye. That night, when I looked through the sliding door to their bedroom, I saw Kana, flushed as she straightened her messy clothes. I was captivated by her lewd appearance, and the next day I saw Kana comforting herself again. The sight made my crotch swell, and I was so absorbed in thrusting my dick into Kana from behind...