Kat and I broke any pretense that the half-hour early morning fucks were going to suffice after we got home from Vegas. We still did them once a week or so, but as spring turned to summer, and our need for intimacy grew, we started taking advantage of her boyfriend's work travel schedule during the week. We started cooking together. We went out to dinner or drinks at out-of-the-way restaurants and bars, where it was less likely our presence together would be noticed. And we started ramping up our games to higher and riskier levels. The thrill was just too great a temptation.

One Friday night in June, Kat and...