There's a scene I know of with Jenna Haze, a BJ scene where the guy can't handle her skills and keeps pulling away. I believe it's from Bikini Clad cum sluts or something. Well worth a look
http://server5.*********/posters2/6/6c35ab8be8fa45d0302819217e9f9b0917df6f56.jpg
I found a screenshot!