While my wife was busy preparing dinner in the kitchen, my sister-in-law suddenly kissed me. When I asked her why, she remained completely silent. My wife left for her trip as planned. My sister-in-law was supposed to go home as usual, but I couldn't stop thinking about the meaning behind last night's kiss. At first, it might have been just a fleeting moment. But our relationship gradually grew deeper. I forgot all about my wife, and we kept making love over and over again like passionate lovers. That intense, thrilling sensation is still unforgettable.