In this story it is the younger version of Hiccup and the gang from HTTYD 1, Crystal is the same age as Hiccup, just imagine this scene in the academy with younger Hiccup and Crystal.

"Ready?" Fishlegs asked Hiccup and me.
"Ready." We both said together.
"3..2..1 GO!" Ruffnut and Tuffnut head-butted each other and Hiccup and me took off.
Hiccup and me were both racing around the island and through the many mazes of sea stacks until we went through the traditional obstacle course and back to the academy. My dream race had begun.
"Alright girl, lets show them what we can really do." I said to Night. She roared in reply and started to put on speed. I positioned myself in the saddle to make the ride easier on myself when Hiccup and Toothless zoomed past us and around the corner of the island.
Night folded up her wings and swerved around the corner, my maneuvering abilities giving us an extra burst of speed as we did so. We were gaining on Hiccup, but right when we were about to pass him, we slowed down just a touch. I looked down at Night and she gave me a small nod. If we were going to win this race we had to do this now and it was the only time we could do this. Making sure that everything looked good with her flight patterns and what not, I slid off of her back and she grabbed me with her feet. Without slowing down she did a flip and I was tossed into the air, the momentum of the flip sending me flying over Hiccup towards the sea stacks. I was starting to fall when Night caught me on her back, and we darted toward the sea stacks.
Quickly maneuvering our way through them, we headed toward the obstacle course, Hiccup no more than a tail's length behind us.
Right before we darted into the trees I looked back at Hiccup and said "Lets finish this dragon boy."
We both flew into the trees, Night pulling farther ahead every moment. I then looked back at Hiccup and saw him, far behind us. I slowed down a bit and thought about what I was doing. Did I really want to win again, after I had won so many times before? My instincts gave me my answer. I pushed on Night's saddle so that I would loose my balance, and I fell off of her, causing her to stop and catch me. Night barely snagged my shirt in her teeth, and as she did Hiccup raced passed us and turned towards the academy.
Night then threw me up onto her back and we went full speed after Hiccup. I knew we weren't going to catch up to him though. Those extra few second were all he needed to win the race, and I wanted to make the outcome as believable as possible.
Me and Night lost by only a muzzles length. I got off of her and stamped my foot, pretending to be frustrated, when really, I was glad I didn't win that race. I had everything I needed right here with me.
Everybody started to congratulate Hiccup and I was walking out of the academy when Hiccup got in right front of me.
"Thanks." He said to me.
"What are you talking about?" I said nonchalantly, trying to keep the blush from creeping up my cheeks.
He laughed and then changed the subject. "Dragon boy, huh?"
"Yeah." I said. "Are you ok with that?"
"Of course I am. It's a great nickname and I would like to be called that by someone other than Snotlout."
"Yeah, ok." I tried hard to keep the disappointment out of my voice. I wanted that nickname to mean something special that he could relate to me, but he just thought it was a good nickname now spoken by someone who didn't annoy him.
I started to get onto Night when he pulled me down and said "I'm sorry for being a jerk last month to you Crystal." Then he kissed me on the cheek and went over to Toothless. Now blushing beet red, I flew out of the academy laughing happily and smiling like there was no tomorrow.