There are several of the highly respected dommes, who post at maxf or who have done so in the past, and some who post here or are reviewed of discussed here, who have reviews of their sessions including exactly this--golden shower with instruction to drink or open the mouth, during or near the ending of session, without being asked or instructed specifically.

It is clear from the review or discussion that for some of the subs, this was a surprise, but presented as probably normal for the domme.

The dommes have often a sentence or two on their website that they often push limits or enjoy pushing limits.

One domme who is reviewed at maxf or who posts at maxf even has it written on her website, that, this is very likely or almost certain to happen, though she uses slightly diff words.

Dommes have diff personalities and approaches.

But some of the best enjoy seeing what a sub will do unexpectedly or without his knowing beforehand.