If you play D&D or read a book or watch a movie or play a video game, you're giving consent to have your feelings manipulated. That consent is revocable — you can stop playing, put the book down, turn the movie off. There's real and serious issues with how that consent is negotiated and communicated, whether your consent is informed, and the like. I don't want to gloss over those, only note that there is some form of revocable and conditional consent offered.