Workout Room Tryst

I've been married for five years now and our sex life has remained pretty stable. Yet last week, something unexpected happened when I was alone with one of my clients in the gym's workout room. She’s a bit younger, but she often pushes me during training sessions, always striving to improve her fitness level. We’ve developed this unspoken dynamic where we challenge each other mentally and physically. But things took an unexpected turn last week when I walked into the workout room with her, and there was an odd moment of silence between us. The air felt charged with electricity as she looked at me intently, eyes flickering downward to my hands flexing around a dumbbell. It’s hard not to notice her body under those tight shorts and tank top, every muscle defined by sweat and exertion. Suddenly, before I could react, she stepped closer, pressing herself against me with a soft sigh as her lips brushed past my ear. Her hand slid down my chest and grasped my cock through the fabric of my shorts. The shock was intense, but so was the arousal, feeling her touch like that made everything go dark momentarily. We ended up on a yoga mat in the corner, exploring each other’s bodies with a fervor neither expected. She tasted like mint from pre-workout gum and smelled faintly of sweat and skin lotion. It felt incredible to have my mouth pressed against hers as her fingers worked over me, and then she was straddling me, riding out our mutual desire until we were both spent. It's strange though, usually I'm the one who pushes limits in training sessions, but this? This felt different somehow. Is it normal for someone to just take the lead like that, even if it’s consensual? What does it mean about me that I enjoyed being taken by surprise like this? Am I losing my grip on what's professional versus personal?