Miss Bedlam has an added surprise as she facesits her sub.
The first is that she is going to let him masturbate while she sits on his face.

She even warms him up by teasing his cock with her feet.

The second... is... particularly as he gets close there is a very pissy surprise. Miss Bedlam pisses in the bodysuit she is wearing, soaking his face and as she moves her arse back down to sit on his face, effectively water boarding him.

This is enough to completely thrust him of his stride and deny any form of release or orgasm.