it asked if it could stretch its permissions to surprise Master Pixie. It wore Her cock inside it, hidden by a dressing gown and asked permissible to give Her oral service. She accepted, and after Her first come ("cum"), it told Her that it had masturbated whilst sucking Her cock. She asked how that went and it said it made it wet... and, between licking Her, it asked if She would like to feel?
It was that point that She reached down to find Her cock in its pussy.

This slave had never done anything like this before... it is trying to be more proactive and brave and not fear "topping from the bottom" as its Owners have explained to it (over and over) that it is ultimately down to Them and They like the chance to deny it.