My ears are ringing from the alarm bells. It is one thing to have a relationship that has moved beyond the use of safewords (a concept I'll happily debate). It is entirely another to use the threat of ending the relationship if someone uses their word. A safe word is there for the health and wellbeing of the submissive, not a weapon of the Dominant.

Further, going to a play party, where other people are involved, under such conditions is very unsafe. The Domme has no idea what could possibly happen and to hold such a threat over her sub shows a striking lack of concern for his personal safety.