Sterek Hotel Transylvania AU: For monsters, there is a place of sanctuary hidden beyond the haunted forests and creepy marshes, far from the human world: Hotel Transylvania. On one special weekend, Robert Hale invites every monster to the hotel to celebrate his son Derek’s 118th birthday.
As part of his birthday, Derek asks if he can venture out into the human world. His dad agrees, telling him there’s a town not too far into the forest—but the town is a set up and the zombie bellhops dress up as humans in order to scare Derek into returning home and staying there, where he’ll be safe.
However, everything goes wrong when a human unwittingly follows the zombies back from the town and crashes the party. Stiles, a free-spirited young man who has been wandering around the world, gets caught up in the festivities, disguising himself as a monster and hiding the fact that he’s a human from everyone at the party. However, when Stiles runs into Derek and something happens—they fall in love.
Stiles and Derek get along wonderfully, but as they grow closer, Robert grows more weary. He takes Stiles to a private room—covered in dust and shrouded in darkness. He leads Stiles over to a large portrait that hangs on the wall, the curtain pulled down enough to see the beautiful face of the young lady.
Stiles exclaims that he knows her: Lady Talia Hale. He says that he’d travelled to the castle where she had lived and had learnt about her story; she fell in love with a count and they lived in the castle, but one night, a fire started and the family died. He says that when he had been there, it felt as if a soul had been trapped there.
Robert tells him that he’s partially right. The fire wasn’t an accident: the villagers had started it as they tried to hunt down the count and his wife. The count and their child had escaped, but Talia had died.
He steps forward and tears the curtain down, revealing the other half of the portrait: a young man standing beside Talia, smiling. It’s Robert.
He explains that he built the hotel to keep his son safe, and that he has tried to keep Derek there in order to protect him. Stiles promises that things have changed, that monsters are no longer hunted and Derek would be safe if he left.
“Can you promise me that, if we were to go into the human world, everyone would accept us?” Robert asks.
Stiles, heartbroken but understanding Robert’s worry, says he cannot. He promises to leave, but Robert asks him to stay one last night so as not to ruin Derek’s birthday.
Derek’s party is a great success . But that all changes when Derek kisses Stiles; Robert overreacts, and in his outburst, inadvertently confesses to deceiving Derek with the town. Among the chaos, Stiles is revealed to be a human. The guests are outraged by the deceit at play, but Derek is undeterred and wants to be with Stiles. Stiles – out of respect for Robert – pretends to be revolted by Derek and rejects him before leaving the hotel.
Derek is heartbroken. Robert goes looking for his son, finding him sitting on the roof and cradling the present his mother from his mother. Robert tries to comfort his son, but Derek passes him the book, a story that Talia had written about how she and Robert fell in love. Derek admits that he fell in love with Stiles, but thinks Stiles didn’t love him back.
Robert realises that he was wrong; in trying to protect his son, he had only ended up hurting him.
He chases after Stiles, tracking him down and apologising for everything he’d done.
When Robert returns to the hotel, he returns with Stiles. Stiles admits that the feelings were mutual and that he fell in love with Derek too.
