Warcraft - any that would fit - any character it would apply to trying (and failing) to struggle against the Lich King's control. Maybe it's when they're dying/becoming a Deathknight, maybe it's something like Sir Zeliek where the consciousness is awake, but the person can't control their actions.

This can be sexual or not, but I'd particularly love to see something that was mind-break on the level of wanting to do something that you KNOW you don't actually want to do, and the moment for a character where that line blurs completely.