Like an audio drama but it's pornographic and the listener is the silent "main character" whom the VA pretends to have sex with. Sometimes it is called audio roleplay. They often include various sexual sound effects which are sometimes made by the creator but are often pulled from audio libraries. Stuff like wet sounds, meat on meat, cloth rustling, and furniture creaking. The roleplay can be anything. GFE, Boss/CEO, Monstergirls, Enemies to Lovers, Demons, Angels, Eldritch Horrors, superheroes/villains, dub-con, etc.