I have done a situation similar to this. A belt around my throat, strong legs straddling me, Master bent over me whispering in my ear and tightening the belt until I wheezed. I didn't thrash or fight. I know my position and it was what I asked for. The light headed feeling was a rush and a great high. Not one I'd experienced before. What you describe sounds much safer. No chance of leaving marks on my neck again and less likely to crush my windpipe. Would you like to see pics of this when I get someone to play along with me at home?