A Secret Workout Routine with My Client

I've been her personal trainer for over six months now. We get along really well and she's made great progress in our sessions together. But there was this one time when we were working out at a private gym late at night, just the two of us. She had a few drinks earlier that day and I could tell she was feeling more adventurous than usual. Without warning, she started talking about her fantasies involving me, nothing sexual initially, but it got pretty suggestive as the conversation went on. Before I knew it, we were kissing in the corner of the gym while my hands explored places they shouldn't have. It's been a week since then and while our relationship is still strong, there's this underlying tension that wasn't there before. We've both admitted to feeling conflicted about what happened but also defiant, like we want it to happen again.