Most epic one on giving that comes to mind was with a sb that I was slowly and methodically introducing into the bdsm lifestyle. Had her all bound up with restraints and blindfolded. Extreme sensory overload and deprivation for a couple of hours, continually edging her. When I finally allowed her to orgasm, it was epic. She was cumming so hard she was crying and lost all bladder control, her entire body was almost to the point of convulsions for about 15-20 mins.