I don't like that position because the angles are wrong for me to fully penetrate the throat. Your partner's throat should be as straight as possible. My favorite is to put my partner on his back, head hanging over the edge of the bed. Then I can bury my cock down his throat - and see his throat bulge as I go in (I sometimes grab his throat to feel it, too). Of course, you need to work out a rhythm so he can take a good deep breath regularly. Try it, you'll like it!