Realms Between Us //Vkook\\

Jeongguk doesn't know how spirit magic or Ouija boards work. He assumes it takes something a lot more complicated than a drunk man asking for a sex demon to show up for it to actually happen. Something like cutting your hand and letting your blood drip onto the petals of a rare flower. Or saying something religious into a mirror while doing the Macarena.

That's how Jeongguk knows that this is a prank.

That's how he knows that the boy sitting on his bed claiming to be an incubus is lying.