(sirius pov)
I gaped at the beautiful creature standing before me, not believing that she was a friend of Remus. I stood up, ran my fingers through my hair, and put out my hand.
"I'm Sirius." I said, trying to keep my cool.
"Katrina." She said softly, shaking my hand.
There was an awkward silence as we shook hands. I noticed her eyes were a deep, dark chocolate color and her fair complexion was slightly tanned. Remus looked quickly from me to Katrina, she looked uncomfortably from me to Remus, James slyly gazed at Katrina and then moved his stare to me, and Peter uneasily shifted his look from Katrina, to me, to James, to Remus.
I quickly withdrew my hand and let out a nervous chuckle. I've never felt this nervous around a girl before. I looked around with my mouth dry, to see if any of my other friends were feeling the same way I was, but they were all staying coolly in their place, staring at me. I sighed and resumed my stare out of the window, putting my feet on the seat opposite from me, trying to look as cool as possible.
Remus cleared his throat, trying to break the silence and the tension in the air, "So, Katrina, where did you move in to?" Remus sat next to my feet and Katrina, next to Remus. Katrina started talking animatedly to Remus as I mouthed, 'Thank you mate', to Remus. He nodded at me and went back to paying attention to Katrina's discussion about the cheapness of soap bars here compared to Denmark.
I couldn't focus my concentration out the fogged window anymore, instead, I would look out the window, sigh, as though I was extremely bored, then quickly glance at Katrina to see if she showed any signs of wanting to talk to me, ruffle my hair, and then continue my look out the window.
I was in my fifth cycle of this attempt to show off, and had started to doze off, when Katrina's navy blue skirt brushed against my leg. I suddenly jumped in my seat, kicking Remus sharply in the thigh, as if someone had dumped a bucket of ice-cold water on me. Katrina somewhat yelped, due to the abruptness of my act.
"Sorry Sirius, didn't mean to startle you." She laughed. I smiled and ruffled my hair, ignoring Remus' shouts of pain.
I quickly looked out the window and saw the sky gleaming gold and pink. The sun was slowly descending in the sky. I looked around the compartment and saw that James and Peter were already asleep and Remus looked extremely tired and shaggy, still massaging the place where I had kicked him. I nodded at him.
"You all right, mate?" Remus smiled weakly and nodded back. Katrina had taken out her suitcase from the cubby above me and was unlocking it. She opened it and pulled out one of the most beautiful guitar I've ever seen. I felt my jaw drop as she fully took it out and closed her suitcase with a snap. Remus shifted slightly in his seat to make way for Katrina and her guitar. She started playing with such grace and intensity that my guitar playing abilities seemed abysmal, and I was said to be one of the best players in school.
After the song, Remus clapped fervently and I complimented her on her amazing skill. She thanked me offhandedly, opened her suitcase and took out a piece of paper and pencil. The paper had many marks and notes on it. She shifted the guitar under her arm and made some scratches and corrections on the sheet, and then stuck the end of the pencil in between her teeth. I curiously stretched my neck up to see what was on the paper. Katrina noticed and motioned for me to come over and sit next to her. I heard a soft snore and looked around to see that Remus had fallen asleep also. I stood up uncertainly and sat next to Katrina.