My wife who is sober and quiet...is actually a bitchy slut! She puts me to sleep and straddles my subordinate's dick!

After a year of marriage to my wife Yuni, there was a change in her demeanor. My wife graduated from an all-girls college, and right after graduation, she married me after we were introduced by her boss's wife. She is a modest and quiet type of woman. But recently, I began to notice her secret sex appeal. Then, my colleague N, who lives nearby, came to visit me on his way home from work.