It was Hallow's Eve, 1981. James Potter was sitting with the twins, blowing smoke rings for them with his wand, at full leisure under the Fidelius Charm.
"That's enough, now." Lily said, scooping both of the twins up. "It's Alice and Harry's bedtime." She began down the hallway, and up the steps. She was only halfway up, when the door swung open.
Immediately, James got to his feet, and ran at the door, his wand out, ready to fight. "It's You-Know-Who! Run!" He shouted, and he dueled the powerful wizard, with flashes and bangs that scared off the cat and cracked the floor between them. Finally, the Dark Lord had knocked him unconscious, and he sauntered up the stairs. Tonight, he was finally going to take out any possibility of the prophecy.
"Reducto!" He casted at the closed, probably locked and barricaded, door. Lily Potter turned and faced him, blocking him from the crib. Fear was in her emerald eyes, the Dark Lord could see that. But steely determination was in their depths, too.
"Don't touch Harry." She snarled. At least Alice is safe, since she isn't a part of the prophecy...
"Move aside, you silly girl." The Dark Lord said in a voice that sounded somewhat amused.
"No!" Lily, silly as she might have seemed, was firm on her resolve. "I won't let you hurt him!"
"Your choice." The Dark Lord said in a frighteningly soft, gentle voice. "Stupefy!"
The red jet hit her right in the center of the chest, and she fell to the ground. The Dark Lord stepped over her worthless, impure of blood body. He pointed his wand of yew right in front of the boy- or at least, he hoped it was the boy, since he was wearing blue pajamas. He wanted to make this little boy cower in fear.
"Avada Kedavra." He casted. Something unexpected happened, however. The jet, the way it was positioned, hit both twins. The green jet rebounded onto Voldemort. His consciousness slipped from his body, and he was gone.
When James came to, Sirius and Remus were standing over him.
"What happened?" James asked. "Last I remembered, I was dueling You-Know-Who, and-"
"Peter betrayed us, Prongs." Sirius said softly.
"I've got to see where Lily and the twins are!" James shouted. The trio of Marauders ran up the stairs, taking them two at a time, until they were at the remains of the door. James panicked at the sight of Lily's still body on the floor.
"Lily!" He cried. He ran over, and felt for a pulse, and was instantly relieved. "Enervate." Her green eyes flashed open.
"Harry!" She cried, scrambling to her feet.
"He's alright, I've got him." Sirius said, holding the baby tightly.
"What about Alice?" Lily asked.
"She's okay as well." Remus said. "It's just that they both have lightning scars on their foreheads. Harry's is to the right, Alice to the left."
"Well, it'll be easier to tell them apart now." James joked.
"Why do both have it, though, when Harry was the one to vanquish the Dark Lord?" Lily pointed out.
"Remember what the Healers said about magical twins at St. Mungo's? Along with telepathy, they are often mirrors- whatever happens to Harry will happen to Alice, and vice-versa." James explained.
"Harry vanquished the Dark Lord." Lily murmured.
It wouldn't be an unreasonable assumption to assume that the Potter's became very famous, and fame-crazy. In fact, that is what happened. I should know. I'm Alice Petunia Potter, the girl who just happened to survive Voldemort's attack. This is my story.
AN: This is yet another Harry Potter has a twin story, with some elements of Wrong-Boy-Who-Lived. Alice Potter is an OC I've used in Alice Potter and the Gryffindor Heirarchy, a series of drabbles that follows the canon. She was also used in Alice Potter and the Family Reunion. The pairing she's in will remain the same, if you've read the other stuff.
As for her house, it's going to be either Hufflepuff or Slytherin. I hope you enjoy, and thanks for reading. Read and review.