From office rivals to morning lovers—a drunken mistake she doesn't want to forget.

I woke up this morning and found Takeuchi, my coworker from the same hiring class, sleeping right next to me in just her underwear. I have no idea how she got here because I was totally wasted at the office drinking party last night! When she woke up, she dropped a bombshell: "We had sex last night!" I couldn't believe it. Usually, she's loud and annoying at work, but for some reason, she seems really happy about it. When she started asking for more, I couldn't hold back anymore.