Never push too far. Even if you are begged for more. If your judgement or instincts tell you this is dangerous. STOP IMMIEDIATELY!!!

A sub places complete trust in their chosen Dom/me. It is the Dom/me' first and fore most responsibility to respect that. You must always maintain the safety and health of your submissive. Reguardless of any of their subspace induced emotions the sub may have, YOU have to stop!

Talk them down, explain Your actions and concerns to Your submissive. ONce out of subspace they may realise that they were putting themselves in harms way. Usually, this will spring a new wave of apreciation for You as their Dom/me. The trust of the submissive will grow for You and Your strength to know when to stop. For knowing them more than they themselves know themselves, most submissives will apreciate and admire You all the more for.

On the downside, if they will not see that it is the dom's responsibility to care for the sumissive and your judgement is final, as it is your responsibility for inflicting; be it pleasureable of injurous. IF this is the case, You must try to get them into some form of counseling, as has been mentioned before. Or, if this will not work, You must excersise the ultimate sacrifice for the sub's safety adn break off the relationship. This may sound cold, but it is the kindest thing You can do for both You and the sub.

Taking a submissive is a huge responsibility. But the submissive looks to You for support and protection. No matter what the sub may beg for. No reasonable submissive wishes serious, or permanent harm to thier person. Sometimes subspace may get so intense that a sub looses connection with thier surroundings. The most important part of those surroundings, is YOU, the one they have chosen to put all of thier faith and trust into. Keep your head clear and focused, and follow your judgement and instincts, always.