A practical alternative I would advice if the wife/gf is not fan of bounding her partner, and also if she prefers to lay without being on top:
She has to lay on her back with legs upwards, and buttocks close to the edge of the bed. Then, her partner, in order to have his penis at the proper height, has to be next to the bed, in an intermediate position between standing (which would bring the penis much too high) and being on the knees (too low).
After orgasm, he will naturally want to relax and lay on his knees. By doing this, his penis exits the pussy and his face starts narrowing her pussy.
Half of the path is already done, thanks to gravity. It only requires a bit more of relaxing until his mouth finds its place on her pussy...
Living the real life under lock and key