My wife is my neighbor's sex partner. (Akizuki Marina, NACT-046)

My wife, "Marina," and I were living happily together every day. 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, then secretly peeked into the bedroom…