A guy gets taken over by a demon, spirit, parasite, or some other force, and his body starts moving on someone else’s terms. The sex usually turns into coerced fucking where the possessed dude rides dick, blows, or tops with a glazed, disconnected look while his partner reacts to the sudden personality switch. A lot of scenes lean into loss of control, corrupted dialogue, and the creepy thrill of someone being used like a puppet.