I had a SP grip my cock with a pulsing motion when she was straddling me and also as I came, it was fantastic!
So much so that I asked her about it and she was surprised that other women ( SP or civvy) didn’t do this. Her control with her vagina muscles was impressive and I’m 99% sure she hadn’t had any kids, if that helps or not I don’t know
She was a Czech girl and my regular for a couple of years... consistently 9/10 every time.
Anyway, it was fucking ace
She has unfortunately retired now or I’d link her here.