My wife's older sister's fearless temptation to cuckold her, I ejaculated in agony without making a sound

Yuko-san, the older sister of a wife who ran away from home due to a marriage fight. It seemed like a wakeari... At first, he kept his mouth shut, but as he continued to drink, his true feelings began to pop out. "It's sexless." Actually, I was sexless too, and it didn't take long for us to have a relationship, as we were both frustrated with each other. However, Yuko-nee's desires gradually escalate. I hide from my wife's eyes, and in the bathroom, closet, and next to my sleeping wife... As I continued to writh and torment, my reason and my dick were on the verge of explosion.