Can you do this easily

[Clang McFly]

I did that third position when I tried to suck my own cock/lick my own butthole. jk?

It's always good to make an effort at being self-sufficient and to pursue stretch goals, Clang.

In this case however, unless you've got an extremely long cock and a very elongated butthole, there's no shame in throwing in the towel. Take the lazy needy way out -- assume the position and let somebody else do the sucking and licking parts for you.