Demian and his boyfriend, Barnes, were inspired by the Supernatural books by Carver Edlund and by hunters Sam and Dean Winchester. After being tricked by Becky into attending to a Supernatural convention, Sam and Dean mistakenly gathered with Damien, Barnes and others to learn the guidelines for the "case" wherein all participants were to find a body and burn the bones. The Winchesters quickly realized it was part of the LARPing festivities and retreated to the hotel bar.
Later, Sam and Dean noticed a LARPer rush into the bar after having apparently been accosted by a real ghost. They approached the hotel manager intending to get the real story about the haunted history of the property and bribed him for the info. They learned that Leticia Gore actually did kill four children and then herself there 100 years ago. He told them the spirits of all of them had been seen there periodically ever since. When they pressed him for the location of Leticia's crime, the manager said he said he knew, but that the area was "off limits to nerds." After Dean slid him another $50, he revealed that it was the attic. Demian and Barnes overheard this exchange and decided to act on it solely to give themselves an edge toward solving the "case."
The two made their way toward the attic as "Sam" and "Dean," with Demian occasionally barking at Barnes to "stay in character" because, he explained, he looked stupid if he was just doing it alone. Eventually, the spirit of one of the orphan children, which they thought was just a fellow LARPer, guided them to the actual map that showed the location of the real graves on the property. After the Winchesters encountered the scalped ghost of Leticia's son in the attic and learned that in 1909 the police reported that she had killed the four boys and scalped her son, they were intent on burning her bones. They happened to overhear Demian and Barnes assessing the map (speaking in their raspy "Sam and Dean" voices) and approached them to take it. They weren't willing to give it up, though; Demian even flashed his toy pistol at them to scare them off. Dean was by then ready to pull his real gun, until Sam more calmly suggested that their two teams work together. Demian and Barnes agreed to it only after it was made clear that they got to keep the $50 Sizzler gift certificate, and that they got to play "Sam" and "Dean". Sam and Dean were then dubbed "Rufus" and "Bobby."
Sam and Dean followed the other team to the graveyard while being subjected to their interpretation of the 'ghost-possessed Sam' showdown scene from "Asylum." Finally completely fed up with that and the whole idea of having their lives glorified, Dean vented on them by way of a rant about how the Winchesters' lives sucked—not fun, not entertaining, and basically only suitable for those ultimately bound for the nuthouse. Demian and Barnes were left mystified about why he was so upset about fictional characters. Only when Demian and Barnes got to the graveyard and realized 1) Dean and Sam were actually grave-digging and 2) Leticia Gore's ghost was real, did they believe the boys were maybe not there just for the convention.
The Winchesters ultimately found themselves trapped inside the hotel being bested by the evil orphans' spirits. Demian and Barnes managed to get to the graveyard and burn the orphans' bones just in time, and saved Sam and Dean.
When it was all over, Dean thanked them for saving him and Sam and was about to leave when Demian stopped him and suggested that Dean didn't really get what the Supernatural stories were all about. He pointed out to Dean that in contrast to his and Barnes' own mundane existences ("Our lives suck"), Sam and Dean got to wake up every day with a chance to save the world alongside a brother they would die for and know the other would do the same. When it was all over, Dean thanked them for saving him and Sam. It was only then that Dean learned their names and revealed to them that he was the real Dean, but his reply was received only with Demian's "Yeah, me too!" and Barnes' "Get the hell outta here, Dean!" Annoyed, Dean was about to leave when Demian stopped him and suggested that he was wrong about the Supernatural stories: Both Sam and Dean got to wake up every day with a chance to save the world alongside a brother he would die for knowing the other would do the same, which was in stark contrast to their own ("Our lives suck") lives. This suggests they did believe him.
Dean smiled and conceded that maybe he had a point. Before Dean left he found out that the two had met in a Supernatural chat room, and that they weren't just friends, they were partners.