A/N; I apologise in advance for the spacing. I really have no time right now to edit it, so... sorry D:

A beam of purple light flashed past me. I shook my head to dispell the
momentary dizziness, and continued on.
It was the last lesson of the day, and it was Defence Against the Dark
Arts. I was duelling Lily (as usual) and she was basically kicking my
arse.
The room was filled with intriguing objects, such as a giant
Sneakoscope, a Fanged Frisbee, a massive golden aerial that I knew by
sight, but couldn't name, and various aquariums. Flashes of light, the
noises of spells and taunts were heard all around.
We could conjure up anything that could assist us in the duel. This,
according to Professor Kralie, would be essential practice for the
swelling war. Kralie was wandering around the pairs, giving
suggestions and correcting spellwork.
"Carpe Retractum!" I span around and cast a Seize-And-Pull Charm at a
tank of brightly-coloured tropical fish a fair few feet to Lily's
right. The water cascaded onto the floorboards with an ominous swish.
Most of it poured over James, and I smirked. The wet boy looked at me
like a kicked puppy, but then apparently thought that it was
completely intentional, and dried his robes instantly and shot me a
scalding look.
The tank had served a double purpose.
Lily jumped, and retaliated with a Melofors jinx, which I dodged.
"You'll have to do better than that!" she grinned, and restored the
aquarium, fish and the water.
"Fumos!" I cried. A mist of silver smoke poured from my wandtip and
created a barrier between us. It curled and undulated mystically in
the space, creating a sense of the unknown.
Lily had a bit of trouble vanishing the smoke, as I predicted. Fumos
was hard to get rid of.
I was ready.
"Baubillious!"
A streak of white lightning flashed through the classroom and
illuminated the space. I could see no-one clearly for a few moments,
and neither could Lily.
I heard her voice ring loud and clear: "Colloshoo!"
Her orange Sticking Hex missed, and struck the enormous, ticking clock
behind me.
The Fumos smoke finally faded, and my amber eyes looked into her emerald ones.
At the same time, we both cast Disarming Charms. Our aims were true.
Both our wands were sent spinning into the chaos of the classroom, and
we were forced to stop the duel.
Professor Kralie, who had been silently watching us duel, Summoned
both our wands and held them out to us.
Lily and I came to collect our wands, and we smiled at each other. We
were both experienced duellists, and it was almost a test of who was
superior every time we duelled together. We both wanted to triumph
over the other.
As we received our wands, Kralie started to speak to us.
"Excellent work you two. Excellent, excellent. Take thirty points each
for Gryffindor. Now. Lupin."
"Yes, sir?"
"I hear you're quite the tutor."
I scratched my neck in embarrassment.
"I... I'm okay, I guess."
"How would you like to come and assist me in teaching our Duelling
Club? Miss Evans would be welcome to too, of course."
I looked at Lily. Her eyes were bright.
"Well? How about it? It's our chance to actually do something to help
in the war. Arming Hogwarts' students?"
"I... don't know. Maybe..."
"I'll assure you that you will get paid," Kralie continued. "After
all, you will be co-teaching."
"I'll do it if you will, Lily," I shrugged.
"Okay, that's settled then!" she said brightly. "So, Professor. When
do we start?"