My dominant have I have an agreement that we are free to have a play session with someone else, we have boundaries and limits of course which are no sexual contact and if when we are in a club we play together first. (this is because I don't like to play with others and so he knows I am happy and content before he plays with another)

Our relationship is exclusive and I don't see that him having a session with another girl as cheating, or wrong. He simply likes to play a lot, and I can't do several sessions in a night. He enjoys the differences between me and these other girls, he likes working his 'domly voodoo' magic on others.

When he first suggested it I was not sure, as I'd never had to share him, I said I'd know and be able to make my mind up when I saw it.
When I saw it I knew I was okay with it because he invited me to join the play by using some sensation toys on the girl while he was flogging.

He has assured me that he would never touch another girl again if I said I was uncomfortable with it, and I know he would be true to his word. I'm proud that now he has begun playing with others, they are coming to him to ask for sessions, it has given him a confidence boost which is beautiful to see.
I don't feel like I have lost anything, he has gained so it works for us.

Hope that helped