The first time she tried this with a blow job, Van Vleck set a timer for 10 minutes, just to take the pressure off. For more reading specifically on oral sex, check out these posts: Allow me to voice my strong-standing skepticism: Not in the way that some ladies claim to love it just to get high-fives from the guys. Dental exams and oral sex are not the same thing.
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I was not convinced. Use your hand as well to stroke his penis firmly as you bring his penis in and out of your mouth. This can be very arousing for him and quite the visual experience as well. You might've heard about mythical unicorn women who could pull this off without gagging or vomiting, or maybe you've seen some version of it reenacted in porn which, reminder, is edited and not at all real , but that expectation is very much bullshit.