DVP is an acquired skill.
The first time we tried it, me and the other guy pretty much blew our loads without ever really successfully completing the task to pleasure KK.
The body positioning is certainly something to figure out. We’ve done it with one guy on the bottom; variants with KK on top, facing him, and KK on top, reverse cow-girl (sort of), and what’s called ‘King’s X’ - the two guys have to get situated cock to cock, and the woman squats over the two cocks simultaneously.
The cock size and shape for those involved is material in how to do DVP and succeed at it. If one guy is longer, being positioned with him on the bottom, the woman on her back atop him, while the shorter cock guy enters from the top works out OK.
The basic idea is that the longer cock is coming in from behind, in either of those female-superior positions.
Girth might be a problem - it depends on the woman’s physiology. Despite the fact that a pussy can be stretched significantly, two really thick guys can be too much.
The ‘King’s X’ position is awesome, if the woman is flexible enough to pull it off. This position lends itself to the guys being able to keep their cocks pressed together, use their hands as guides, and lets the woman be in control of penetration. Once things get started, the guys can use their hands to stimulate her clit, nipples, etc.
So far, the downside is that sex in this position doesn’t last long. It is so intensely pleasurable that even with stamina and experience, both guys are likely going to blow long before her orgasm.