That's what limits are for. Both must respect them. Perhaps you're a sub at home only. Or at specific times or places. Maybe later - maybe- you might be ready for 24/7. Or not. Until then, participate when it's comfortable. If you wish to push the limits at times for the thrill, communicate this. But forcing or intimidating or overstepping the agreed limits is a quick way to kill not just a mood but the comfort of the desire. If he can't control himself...he can't control anyone.