Physician’s Forbidden Exam

I sat on the edge of the bed with my bare legs crossed and started playing with his hair again and I repeated, “Your hair needs to be longer,” you can’t give a lesson too many times. A jock type, he had black hair and tan skin and a big white smile with thousands of dollars invested in dentistry. XXX The conversation became more interesting. I smiled and sat down on the bed. “Yes”, he gurgled, “I want to play.”
“OK, now let’s start again. Convince me.”
He looked down at his shoes and I rubbed my bare foot under his chin. “You know, now, if you lock it and leave me with the key, I don’t feel any obligation at all, ever, to give you the key again, right?