Although a2p isn't healthy for the lady. This type of maneuvre is being done in some porn movies once in while.
And since it is being done anyway. I thought it might be interesting to make a dramatic sex-play out of it.
The guy would take his cock from the lady's pussy and move it to her ass. After a couple of strokes in her ass, the lady would take out his cock and put it back inside her pussy. They would go like that p2a and a2p a few times. Then another guy will come up and together with the other guy DP her. But after a couple of DP strokes, this lady to the surprise her ass-guy would take him out of her ass and try to stuff his cock inside her pussy for a DPP. "Come-on, do it!", she would tell the guy.
After a good DPP ride, both guys would simultaneously go p2a on her and DAP her. A little overwhelmed by the sheer size of the two cocks inside her ass, the lady would forget about playing a2p, p2a games with the guys and let them have a good DAP ride on her.
Too often the lady is passive with ass-banging guys in sex scenes. It would be nice to see for a change some semi-joking contest of wills and sex-play between the lady and the guys, where the guys would eventually come out on top and have their way with the sexy lady.