NACR-778 Masochist Married Woman NTR Senior Couple's Dirty Plan Tsukasa Nagano

I was invited to the home of a senior from my university days. He seems to be happy and married to a wonderful wife. It's been a long time since we met again, and while we're talking about memories, it gets late at night, so I decide to stay at my senior's house, but in the middle of the night, I witness his masochist training with his wife. The next day, my senior left home for work and I was left alone with my wife...