MIAA159 — A Sudden Downpour Strands My Girlfriend's Adult Younger Sister—and We Have Sex Until Morning...

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A man is considering marriage with his live-in girlfriend. She has a much younger adult sister named Akari who often visits their home. One day, a sudden downpour leaves Akari unable to get home, and she arrives at their place soaked through and looking for shelter. Her older sister is stuck at work, leaving Akari alone with him. He has always treated her as his girlfriend's cute younger sister, but her wet clothes reveal a mature body that suddenly makes him see her as a woman. He loses control and kisses her, and the two have sex again and again until morning.