Just the head to make the guy freak out

[CoSto]

I'm looking for scenes either during the blowjob or I've seen it in between changing positions where just out of nowhere the chick zeroes in on the guy's cockhead and is not satisfied until he moans or freaks out. It can be sucking just the head really fast but I more commonly see them just suddenly start jerking the head really fast (doesn't necessarily need to be fast, just isolating the head). A big plus is the dude actually squirming and freaking out

Lindsay Kay pulls this on Jon Jon in Bro Blow and he wigs out and makes her do it again
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Any others?

Thanks!