Lunalyne

She was there the moment Tom woke up. An unknown girl inside his heavily-warded cottage in the middle of nowhere. Yet the girl said she arrived there by accident, but Tom didn't believe her of course. - Finger, Non-con

One New Year's Eve, Hermione started experimenting with it, not knowing that she was about to call upon four Dark Lords from another world, as foretold by a new prophecy. (Hermione/Multiple Tom Riddle Jr)

Hermione is invited to a Slytherin party where a game of Truth or Dare becomes very interesting.