[this is my (late) Christmas gift to Nova_Williams , I hope you like it Nova~
And I apologize if I have not portrayed your character correctly, I tried my best.]

[The character Nova belongs to Nova_Williams ]

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It was late in the evening when a beat up white truck pulled up to an old cabin in the middle of the woods. Snow could be seen lying on every available service. Allen parked his truck and turned it off. He got out of the vehicle and lazily walked up to the door to knock. I hope they don't nag on me for being late, he thought to himself. He, Matt, and Nova had decided to spend a weekend at Matt's house, why they needed to Allen had no idea but they apparently wanted him to be there so he came anyway. A moment after he knocked the door was opened revealing his sister Nova.
"You're late," was all she said as she stared up at him.
He sighed, "yeah, I know. Can ya let me in now?"
She rolled her eyes at him but stepped aside anyway.
Allen walked in taking his icy boots off at the door then closed the cold wood behind him. He looked over at Nova and asked, "where's Matt?"
"He's in the kitchen making pancakes," she responded as she walked towards said room.
Allen raised a brow, but in good humor, and questioned, "pancakes? This late?"
She turned to say with a grin, "anytime is good for pancakes!" then went on into the other room.
Allen followed after her to indeed find Matt standing at the stove, spatula in one hand a pile of pancakes on a plate in the other. Allen would've asked him where is maid's apron was, they had a particularly bad habit of constantly teasing one another, but decided against it as his attention was otherwise occupied by another figure in the room. Kumakuro. The foulest of beings. Yet there was nothing he could do to the bear, except glare at him, as Matt wouldn't have it.
He ended up scooting closer to the other side of the room while keeping a watchful eye on the thing until Kuma grunted, glared back at him, and got up to lumber out of the room.
While Allen had been in a glaring contest with kuma Matt had finished the pancakes and set the very full plate down on the table.
"Made some soup for you Al," he said with a glance over at his brother. Allen gave a hum of thanks and went over to get a bowl as Matt and Nova sat down, poured out what seemed to be a bottle a maple syrup each over their own plates, and began to devour the pancakes. There was no other way to describe the scene...
After they ate they all went into the living room to sit on the couch and watch various movies together. About midnight it was decided that the day was done and sleep was needed. Well in Nova and Allen's case, Matt stayed up to do some reading.

The next day they decided to go outside and do some activities out in the snow, they being Matt and Nova. Allen was perfectly content with the very warm and not cold cabin. But Matt eventually bantered him into going out, though begrudgingly. So now here he was, cold enough to have even slipped his gloves and a scarf on, hidden behind a large tree getting pelted with snowballs. Oh the joys of siblings. Especially snow-loving ones. He sighed, breath puffing out and floating away in the frigid air, then picked up more snow and formed it into a sphere. He repeated the process, now having a snowball in each hand, and waited.
As soon as there was a lull in the barrage of snowballs he steeled a breath and quickly leaned around the tree, aimed, and hurled his snowballs towards his siblings. Nova had chosen to hide behind his truck though he just aimed a bit above and the snowball managed to land on her head, from which he could tell by the sudden, somewhat high pitched, "eep!!" that rang out. Matt on the other hand was an easier target, having not hidden at all, so he was blasted with a mound of snow to the face. Allen could hear Nova giggling at that. Just as quickly as he'd turned to throw the snowballs he whipped around and ran into the forest to escape Matt's snowy wrath. He kept running and weaving through the trees until he was sure he'd gone far enough to be able to pause and catch his breath. What he did not expect, however, was for Nova to suddenly spring up from behind a bush with a yell of "surprise!!", grinning from ear to ear, and chunk a snowball at his head. He tried to duck but wasn't quite fast enough and ended up with the icy particles slamming him in the side of the head and falling down into the back of his shirt and jacket. Allen gave an involuntary shudder at the chill.
Nova laughed and Allen was just about to grab some more snow when a shadow loomed over him. He froze, he'd forgotten about Matt...
Matt reached up and pulled on a limb above their heads and snow came crashing down over Allen. This only caused Nova to laugh harder and she gave a high five to Matt who smirked at his deed. Allen, who by now was beginning to not be able to feel his hands or feet (or face for that matter), was not as amused. After a bit more laughing on Nova's part and complaining from Allen, they finally dug him out of the snow pile and decided to head inside for some hot chocolate and to warm up.

Allen had curled up on the floor next to the fire with a thick blanket wrapped around him near as soon as they entered the cabin. Matt shook the snow out of his hair, took off his coat and iced over boots, and went into the kitchen to make the hot chocolate. Nova grabbed her own blanket, as Allen had refused to let go of his for even a second, and sat down next to Allen in the floor next to the fire.
After a few moments Matt walked into the living room with them and handed them both a cup before sitting down on Nova's other side with his own. Allen downed his as soon as the cup was placed in his hand. Nova sipped on hers while Matt drank a gulp then held his cup in his lap.
"So....remind me again just how that was a fair game?" Allen asked.
"All's fair in love and war," matt responded.
"yeah, and that was definitely war~" Nova added with a grin.
"I still think Matt cheated by using that tree..."
"You said no giant snowballs, you never said anything aboot using the snow from the trees..." Matt replied, face near expressionless yet held humor in eyes, his statement receiving another giggle from Nova.
Allen gave him a stare before saying, "touché....."
They bantered a while more before bringing out some board games and playfully taunting and mocking each other as the sun fell down behind the snowy horizon.