My wife is my neighbor's casual sex partner. (NACT-021)

My wife and I, "Wei Nai," were supposed to be a loving couple. One day, after finishing work early and returning home, I found a pair of unfamiliar shoes in the entryway. Looking into the living room, I saw my wife and our neighbor greedily playing with a penis—a face I had never seen before. Even more shockingly, on her phone, there were videos of her obediently following the neighbor's instructions. The next day, I lied and said I'd be late, secretly peeking into the bedroom…