...edging" -- you mean anticipation? Egging someone on? Blue balls?

Yes! :) It could be someone else, it could be someone alone. Brought to the edge, forcibly or not, repeatedly or not.

And you're totally right. These could be blended!

Now, I don't know if you could fit alien tech-induced bound tentacled double-penetration public group sex on top of the Torchwood SUV with episodes of edging while Jack watches and beats off into 600 words...

But I'd like to see someone try.