When my wife and I first met and began dating, she started a torrid little affair with a coworker half her age.
We lived far enough apart that I would spend the weekends with her, from Friday night until Sunday morning. If her days off lined up just right, she would come to my apartment on occasion and spend the night, but we mostly spent our time together at her place. In any case, that left her with free time during the week to have fun with her new boy toy.
When it was our time on the weekends, I would tease her about tasting dick when I was eating her pussy or telling her she felt stretched out when I was fucking her. It was mostly in fun, but we both enjoyed it, and she would tease me right back.
So she came to apartment this one time, and after dinner, we went to bed. I started playing with her pussy, and as I began to lick her, her stretched out pussy lips were very obvious. I started playing with them and eating her pussy harder, told her that her lips were very stretched out, and asked what she had been doing.
"James (boy toy) has been over all afternoon".
Throughout the night, I prodded her and asked more questions, and she would provide the details, but that one sentence told me all I needed to know. I knew exactly what she had been doing by the way her pussy looked, and eventually made her confirm it.
If that wasn't the hottest thing she has ever told me, it would be a close second!