" Why did we come back this way instead of popping up somewhere less…cramped?” I asked, substituting the word cramped for creepy. I was trying not to feel weirded out that I was in my boyfriend’s crypt. It was only a building, after all.
A very unpleasant one.
“This is a portal,” he said, as if that explained everything.
“A what?”
“A portal,” John whispered. “A direct link from here to the Underworld. That’s why you don’t feel dizzy this time.”
I hadn’t even noticed, but he was right. I didn’t feel sick, for once, though we’d just jumped between astral planes.
“This is a doorway through which the souls of the departed enter the world of the dead after they pass,” John explained softly. “The doorway closes behind the dead once they enter. They can never leave again-“
“Unless they escape,” I interrupted. Because this was what had happened to me.
He glanced down at me with a teasing smile. “Unless I choose to let them escape,” he said, “because they seem to want their mothers so badly.”
“That was two years ago,” I reminded him. I shouldn’t have mentioned the thing that morning about being inexperienced with men, even if it was technically true. He was never going to let me help him if he always thought of me as someone he had to protect. “And do I have to remind you that you didn’t let me escape, I-“
“Shhh.” He held up a hand. “Someone’s coming. "

― Meg Cabot , Underworld (Abandon, #2)