Suck/fuck where penis isn't shown

[Valcuers]

I'm looking for scenes, where there is actual sucking/fucking, but the penis never shown on the camera, the angles and the body parts always block its view.
Especially interested, where two guys doing the girl, and she, seemingly - cause the viewers can't see - finishes one of them with her mouth.
Could you tell me where to look for this kind of clips, or post some here?

 

[cumshotfan2010]

I set up a similar thread here; http://board.freeones.com/showthread.php?t=254367