What if Adam wasn't their only half-sibling. This is a story which John Winchester is Elena's Birth-Father but she don't know. (Sorry for the bad description). I do not own Vampire Dairies or Supernatural. Also this story will contain cuss words.
Note: Song of the day is Train wreck by James Arthur, and for this story, in supernatural Lydia is played by someone else, and Stefan did die at the end of season 8 but came back to life. Also in this story Elena is Bisexual is married to Damon.
"Sam, Dean" Chuck yelled in the library in the bunker. "Castiel" Chuck yelled.
"What the hell do you want" Dean asked as Sam, Dean and Cas walked.
"I have some news for you" Chuck answer.
"Ok, what is it chuck?" Sam asked as everyone took a seat.
"Sam, Dean, you two have a little sister" Chuck said slowly.
"What?" Dean yelled.
"Well half-Sister" Chuck corrected himself.
"Wow" Sam said.
"It was Elena Gilbert, but now it is Elena Salvatore."
"What do you mean now Salvatore?" Dean asks
"Well she got married." Chuck answered.
"How old is she?" Sam asked.
"20" Chuck answered.
"That's pretty young." Dean says.
"I know" Sam says back.
"And before I bring her here or you guys go get her I have videos/memories for you to watch and images for you" Chuck stated.
"No" Dean said Everyone was shocked.
"What?" San asked.
"We can't drag her into this world Sammy." Dean answered.
"To late" Chuck said.
"What do you mean to late?" Sam asked.
"He mean she is knows about the supernatural." Cas answered.
"And she is supernatural" Chuck added.
"What do you mean she's supernatural?" Dean asked angrily as Sam sat in shock.
"She was born a doppelganger, and she has an evil 500 year old vampire that looks like her named Katrina or Katherine. Now lets see so images." Chuck says as he brings out some pictures, to avoid the topic.
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"She seems so happy" Dean says with a smile.
"Yay, Did she have a happy live?" Sam asked, smiling.
"Up until she was almost 16" Chuck answered honestly.
"What why" Dean asked.
"You will find out after you see all the pictures. " Chuck answers
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