My wife's vagina, which was so cramped, is expanding day by day...

I've been married to my wife I met at the same workplace for three years, and I'm still in love, just like I did when I first got married. I'm a great founder, but my wife's penis is so good that I feel so close that I can live a happy sex life. However, I feel like my wife's vagina is gradually expanding recently, and my wife doesn't seem to be satisfied. I couldn't get the suspicion that my wife's penis had a dick other than me...a dick bigger than me, so I decided to ask a detective to investigate her infidelity...