Tracy arrived early and stopped me as I was about to cum!

I had decided I was going to cum so i could be relaxed and enjoy myself while she was here, i was pounding my fist over my cock, building up, i was maybe two strokes away from cumming when she opened the door, walked in, saw what I was about to do and told me not to cum! I barely managed to hold it, I slowed down and explained why I was going to cum, so i could be more relaxed, etc. She didn't care what my reasons were, i was not to cum. I have never seen Tracy be assertive or domineering before but she did a pretty good job of it tonight. She was in control and made sure i knew it. She didn't even let me cum before she left