Innocent Mistakes?

I recently started exploring DDLG dynamics with someone online who's really into it. We were roleplaying a teacher-student scenario where I played the student in her twenties, and she was the strict educator... She gave me an assignment to write something inappropriate, and when I did, things got out of hand. It felt wrong but exhilarating... The intimacy we shared afterward left me feeling both ashamed and strangely connected. I don't know how to process this. What does it mean? Am I crossing a line?