Detached Observation of Discipline Session

I recently initiated a discipline session with my 18+ Daddy who plays the authoritative role in our DDLG dynamic. After some heated discussions, we moved to physical affirmation with spanking as a primary form of correction. I felt a mix of pain and relief after each strike; it's an intense experience that feels oddly cleansing. He ensured afterward that I was okay physically and emotionally, which made me appreciate the care behind the discipline. Is this common for others in similar dynamics? How do you balance the emotional and physical aspects without crossing boundaries?