Having an affair with my sister-in-law while my wife is on vacation.

My husband and I've been cold for a long time, while I secretly miss my sister-in-law Karen. Because of my busy work and lack of opportunities to live alone, I haven't seen her again for a year. On this occasion my wife was traveling alone, I immediately invited Karen to the hotel and spent the whole day together. Seeing Karen again, I couldn't control my desires. We rushed at each other like wild beasts, and she even agreed to let me drain all the semen that had accumulated all this year inside her! From morning to night, then night to morning, we didn't waste a single moment. Even in the end, I ignored having to pick up my wife, leaving her waiting at the station while I was raining with her sister...