Yep, I have twice swallowed semen and had a numbing effect on my throat. My boyfriend looked it up and apparently we aren't alone! He generously offered to help out the next time I have a sore throat! Told me to skip the Chloraseptic and come straight to him, lol!
Never heard of that happening, never tried it myself.
I'm going to go ahead and say no. Sorry mate.
I've heard of sort of itchy, but numb? That's never happened to anyone I know....
I was under and woke up to the dentist trying to cum in my mouth, maybe he was doing prep for the operation