Here's how to exert some control over his climax.
Tame His Touches:
When his strokes grow faster, remind him to linger by countering with soft caresses, and restrain him from veering onto erogenous zones (like fondling your breasts). For example, place his palm against your cheek, and lay your hand on top of his.
Switch It Up:
Should you sense him approaching orgasm before you're ready, change positions. Interruption will cool him down, plus it'll take him time to adjust to the new angle and work up to speed.
Distract His Body:
A more drastic measure to bring him back from the brink: Have him pull out, and then squeeze the tip of his penis with medium pressure for 3 to 4 seconds. This will delay his climax and bring his arousal down a bit. Just be sure to warn him in advance.
Distract His Mind:
Sexual arousal and orgasm are largely mental, so try to get him to think about something else for a few seconds. It doesn't have to be the Queen - you could try saying something funny to break the mood and prolong the ecstasy.
Take a Break:
If it becomes obvious he's going to come before you want him to, have him pull out and guide his mouth south for a few minutes. It will give him time to cool down a little, and allow you the opportunity to catch up.