Originally Posted by Coppertop

If he stops jerking off so much, the sex will feel better. At least it does for me. Hopefully then he'll need it less or you can cover the remaining times orally.

It all comes down to his self control. Curbing a healthy 'sturbing habit can he hard, I know, especially for someone his age. But it'll pay off in the long run. See if he can go a day without it. Then two, then three, etc. This should help with the time it takes for him to come form oral. Which in turn will be easier on you physically.