A Personal Training Session Gone Wild (Or Was It?)

So, there's this client I've been working with named Chloe. She’s in her early twenties and absolutely loves the gym, she’s a beast when it comes to workouts but also quite the character outside of them. Anyway, we’ve had this weird vibe going on between us for a while now; nothing overtly sexual or romantic, just this playful banter that can be... let's say flirtatious. Yesterday was one of those days where we crossed an unspoken line. She’s always pushing me to try new things and today, she decided to go all out with some really challenging exercises. I’m talking like full-on circuit training, heavy lifting, everything. And the whole time, it was just... weird. She kept asking me to do sets over and over again when I thought we were done for the day. Then, when my legs could barely move, she started with all these commands like, 'Push harder', 'You can do more', stuff like that. Now, typically, as a trainer, you might think this is just someone really into their workout, but it felt... different. The weirdest part? When we were wrapping up and I was leaning against the wall catching my breath, she came over and said something to me that made my jaw drop. She whispered, 'You're so strong. You make me feel like...' (and here’s where her voice got all soft) 'like I need you to be in charge sometimes.' Now, don't get me wrong, we’ve joked around before with power dynamics and such, but this felt more real than our usual playful banter. And it was at that moment when I realized she wasn’t just talking about a workout anymore. Afterwards, I'm not sure if either of us said anything else about it, the session ended with a weird sort of awkwardness but also a lingering curiosity on both sides. So here’s my question to anyone out there who gets this vibe: is it okay for me as her trainer and caregiver to let things like that happen? Or should I just stick to being strictly professional and keep the flirty workouts in check? Thoughts?