I'm pretty sure I'm completely missing the point, but how on earth did you find yourself in the situation? Like your dick out and blindfolded in a location that virtually anyone can walk into. All of a sudden with little warning you feel something happening down there but you don't peek or ask what's up, you just sit there silently and long enough for you to realize you're getting the best blowjob of your life.

Honestly the more I describe the scenario the more I realize unless it's a trusted partner, this is not the type of scenario that most women would immediately just start going to town without reason. So if you are strictly looking for a woman, at very least one of sound mind you are probably SOL.