While my wife was on a business trip, I was seduced by my sister-in-law, Sumire, and had intense creampie sex until the semen that had been stored for 30 days was empty...

I work for an IT company and live apart from my wife. Due to my job, my wife took many long business trips, and sometimes she came back and asked me to vent her frustration, and my stress and sexual desire were getting stronger each day. I have a good sister-in-law, Sumire, who I am close to, and I often come to our house without my wife. One day, as usual, I was having a small talk while having a drink and was kissed by Sumire. Then he whispered to me with a pranky expression, "I hope I can continue this for a month and abstain from celibacy."