Jack and his twin sister Piper were alone in the Bunker in Lebanon, KS. Both Winchester brothers and Castiel were out on a case. Both Nephilims were left in the bunker for their own protection. Jack had been studying up on Lore while his sister practiced her abilities.
"Jack! Can you come here please?" Piper called for her twin brother.
Jack got up from the table in the war room and headed to the dungeon where he and his sister would practice their powers. He opened the double doors to see his sister standing before a familiar glowing golden line.
"It was an accident, I didn't mean to open a doorway." Piper told her brother.
Jack looked at the doorway, "What do you want to do about it?" He asked.
"I should probably close it. We can't leave here with the Winchesters and Cas out." Piper said, being logical.
Jack looked at his sister before looking at the doorway, "I don't see the harm in exploring. Besides, Uncle Gabriel said we'll never learn anything if we always follow Sam and Dean's rules." He says.
Piper looked at the doorway, "Guess we're going exploring then" she decided.
Jack walked up to stand beside his twin sister, he grabbed her hand before crossing through the doorway with her. When they crossed over, the doorway closed behind them immediately and gasps from other people drew their attention.
"Who the fuck are you and how did you get in here?" Someone asked them.