My sister-in-law Riho discovered her husband was out with another woman, so she left home and came to stay with me. During this time, my wife has forbidden me from being intimate with her because she is afraid my sister-in-law will find out. But she has been at my house for a month now!!! Since I have just gotten married and my company allows me to work from home, my desire is extremely high. My sister-in-law seems unaware and keeps wearing flimsy clothes without any underwear, gradually pushing me to my limits. And taking advantage of my wife being away, my sister-in-law and I drank, and the alcohol made me unable to hold back anymore, so I rushed towards her, releasing all the frustration I've had to endure for a month...