It seems a win-win situation. Each works on the other. Mouth and penis are satisfied. Each gives and receive at once. The trouble is, it can get confusing. How, after all, do you concentrate on giving a world-class blow-job when you’re writhing in the throws of what he’s giving you? True, side to side takes the pressure off, and for a languid, exploratory half hour can be about right, but if what you want is that pressure then someone’s going to have to be top.
You might try this. As usual, the top is in charge – though the bottom needs to know and accept what he’s up to, which is to vary the focus between what he’s doing with his penis in the bottom’s mouth and with the bottom’s in his.
When you’re top, you can just leave it there a lot of the time while you concentrate on giving the blow-job. Let the bottom simply enjoy the size and feel of your cock without feeling obliged to do anything with it. Don’t distract him (too much) from his genital sensations.
But that’s not the whole story. You can vary it by ceasing to work on his penis while you thrust with yours into his mouth – or withdraw awhile and get him to want you back in.
Interrupting the blow-job you’re giving him will complicate and heighten his pleasure. It’s like a shift in gear. While he’s spluttering hungrily on your thrusts he’ll have practically forgotten the other end – so when you resume he’ll be freshly alert to what’s going on there.
And, of course, it doesn’t have to be only your penis you’re giving him. Especially as he’s nearing his climax, it can be glorious for both of you to give him your anus to lick and probe. Once he’s come, while the afterglow lingers, leave him your buttocks for him to nuzzle his face against. Stay lying on top of him so both of you can savour the reassuring pressure of your bodies against each other. Allow time for each of you to close your eyes and relax.