Not with a WL but the most toe-curling orgasm I've ever had together with my partner was with my ex-gf. It was the first time we tried "firewalling". We bought a vibrator for her that day at Honey Birdette and we wanted to try something kinky.

I was deep in her arse after some time of prepping. Then she put the vibrator in her pussy. FMD, the sensation of the vibrator on my dick through that membrane, plus her incredible reactions from doing this act really pushed me over the edge very quickly. I remember she was really out of it after that.