Happened accidentally once when a wl for whatever reason put lube on mr happy to jerk off before the dom. Somewhere along the line it must’ve came off but neither of us realised it - I did feel a different sensation and thought that she had come and that the chemical reactions kicked in so kept on going. When all was said and done and I pulled out I was mortified to find the dom lying on the bed next to us. But she was all cool and said she was on the pill, and everyone lived happy ever after. Did feel good though I’d admit.