JUL-876 While my wife was on a business trip, I was seduced by my sister-in-law Sumire and had intense in-and-out sex until all the semen I'd accumulated over 30 days was gone... Mizukawa Sumire

I work at an IT-related company and live apart from my wife. Due to her job, she often goes on long business trips and occasionally comes back to vent her frustrations by demanding sex from me, causing my stress and libido to build up day by day. I have a close sister-in-law, Sumire, who frequently visits our home when my wife is away. One day, as we were having our usual evening drink and chatting, Sumire kissed me. Then, with a mischievous expression, she whispered in my ear, 'The continuation of this is if you can abstain for one month...'