This is based on Sirius and his girlfriend Marie. Takes place in their 3rd year.

Disclaimer- I made up the character Marie, but nobody else.

Chapter 1- Questions

It was the first day of the new term, and as Marie Antoinette boarded the train, she desperately searched for somebody. She checked the bus 3 times before looking at her watch. 9:59. The Hogwarts Express would leave the station in a moment. She hoped that her boyfriend would come, she knew his situation. Suddenly, a voice from behind startled her.
"Waiting for me?" said a tall, handsome boy. Marie smiled and said 'Of Course' before turning around. She came face to face with Sirius Black. He grabbed her and kissed her before she could even say hello. As the train started to move, he pointed to an empty compartment. "There?" he asked. They walked in and sat down.
"So, how was your summer?" Marie asked. She knew the answer would be bad, but at least she cared.
"Well, lets just say that, it was as good as it's gonna get." Sirius said thoughtfully. "I wished you were there."
Marie kissed him on the cheek. "I wished I was with you." The next 45 minutes was full of miscellaneous chatter. Then the compartment door opened, and 2 guys walked in. Sirius' face lit up.
"Hey. Long time no see!" Sirius said happily. Remus Lupin and James Potter had walked in. Marie, Sirius, Remus and James had all met in their first year. Marie weren't even sure that they saw her. She was right.
"'Ello, James, Remus. Nice to see you again." She said. "James, how is Lily?"
"Oh! Hello Marie! Lily is just fine. She actually said hi before being trampled by her friends." James rolled his eyes. "Sirius, you're lucky. You have a girl that actually holds a decent conversation with you."
"Hello Marie. Ready for the school year? I can't wait to see our best bud Severus!" Remus was being sarcastic.
"Hey, leave Snape alone." Marie gave the boys an innocent look. "He's kind of sexy when he's not being a total jerk." The boys all laughed, and so did Marie. She loved seeing them happy.
The rest of the ride was filled with chatter. But she noticed something particularly strange. They called each other weird nicknames. Moony, Padfoot, Prongs? What did they mean?
"Why do you all have weird nicknames?" Marie asked the boys. The compartment fell silent.