JUL-420 My sister-in-law asked me to stay with me, but my wife forbade me from having sex, and that ended

My sister-in-law Riho discovered her husband going out with another woman, so she left home and came to my house. During this time my wife did not allow me to have sex with her because she was afraid that her sister-in-law would find out. But she's been at my house for a month now!!! Because I just got married and the company allows me to work from home, my desire is extremely high. My sister-in-law didn't seem to know and kept wearing thin clothes without any underwear, causing me to gradually reach the limit of my endurance. And while my wife was away from home, my sister and I drank wine together. The alcohol made me unable to control myself anymore and rushed towards her, releasing all the frustration that I had been suffering for the past month...