Some of the videos I have seen are of a domme or master doing things that would make a person vomit. The things are placing a finger in the mouth and/or using a dildo or cock in the mouth to induce gagging or vomiting. It seems that one position that leads to vomiting is with the person lying on his or her back and with head tilted back a little or somewhat, but that is not the only position obviously.

If you are a domme, have you done things that would lead some of your subs to puke? If you are a sub, has this happened to you? By requesting it or the domme deciding to afflict you?

This could be overlapping with FT or with GS or it could be a separate independent thing in a completely different session, or it could be done afterwards if the domme wishes to afflict the sub.