Sometime you learn even thou you don't know it at the time.  I have had a situation recently just happen to me and learned some things.  Has a Domme you have to know what you want from your sub and from the play time.  You can not let the situation become about what you are doing to the sub and lose what the sub is suppose to be giving you or learning from you.  That even as a Domme I have to realise that even the sub knows that MY wants and needs supersede his and some times I forget that.  I learned that as a Domme I have to be VERY clear on what I want and very clear on learning what the sub whats out of the playtime and out of me.  When I say what a sub whats out of me I mean what level of trust are they comfortable giving me.  Life learning how Sweet it is.....lol