Here's a recent scene idea I thought of for using in a flick.

Ok, so the scene is based around a married couple, with a never done before addition of another cock for the mrs.

He's a solid, buff young stud, ready for action, but first, he takes control of the husband.  He has him sit in a chair, and ties his hands behind him, and his feet to the legs of the chair.

He then ties the wifey up on the bed, legs pulled up to her chest, spread, with rope tied at the knees then to bedpost. Her arms are routed under her knees and pulled back towards head bedpost. 

THEN, he takes another rope, and ties around the husbands dick, going under the balls, nice and snug with a bit of extra tightness!  The stud then determines the distance from hubbys tied dick to his wifey on the bed, and ties the other end around his own dick. 

Now, while stud muffin is fucking wifey like the slut she is, the rope tied to his dick is also pulling on the rope tied to the hubbys dick. Everytime he shoves his dick in her, its pulling on the husbands, like jacking him off. But he has to take it cause he's tied and cant do nothing but watch and get tugged!