Little Mode Workouts

Hey everyone! I'm a personal trainer in my late twenties who also happens to enjoy role-playing as a little sometimes. Today was one of those days where my inner little came out during an intense workout session with my client, let's call him Mark. It started off normally, but about halfway through the routine, I suddenly felt this overwhelming urge to regress back into little space for a bit. Instead of fighting it like I usually do, I decided to just go with the flow and switched roles, I became the little girl, and Mark playfully acted as my protective big brother or daddy figure during our session. It was really fun seeing him take charge in that way, even if we were both still focused on the workout. But now I'm wondering: Is it okay to mix training sessions with this kind of role-play? Should I worry about boundaries and professionalism going forward? Any thoughts from anyone out there would be super helpful! Thanks.