AN: A Christmas present for the gorgeous cutie pie that is Frostbert :3
His head hurt.
Luffy blinked, slowly, trying to get his eyes adjusted to the dim lighting and the pain in the back of his head. Someone was talking right next to him, but the throbbing of his brain and the ridiculously heady scent of flowers distracted him. It wasn't as though he were made of rubber and could simply bounce back; seven year old bodies were fragile and small, and Luffy's was no exception.
"Hey, kid. Hey." Something soft poked his cheek, and Luffy raised a slow hand to swat it, rolling over with a groan. His eyes finally focused, but when they did he couldn't help but yelp, scrambling backwards. A wide, sharp-toothed grin and narrowed eyes peered from a bright yellow flower, and it inclined its petals in an almost nod. "Yeah, I'm the one talking. Now, kid, what's your name? C'mon, don't be shy now."
Luffy paused for another moment, but then offered a hesitant grin. "I'm Monkey D. Luffy!"
"Not Chara? Or Frisk?" Luffy shook his head slowly, and the flower looked perturbed for a moment, before returning Luffy's grin. Luffy couldn't help the shiver that raced down his spine, his instincts, for some reason, warning him of something. "I'm Flowey. Flowey the flower!"
"Where am I?" Luffy asked quietly, deciding – for the first time since he opened his eyes – to actually look around and found himself stunned into almost silence at the large cavern he found himself in. The sunlight was so far away!
"This is the Underground, kiddo. You must've fallen down the mountain."
A mountain? Luffy thought, and for a brief second could recall a breath harsh in fear and adrenaline, rocks beneath his bare feet, and then a head-forwards trip down a deep, deep hole…
He shook it off, banishing the strange memory from his head, and patted the soft flowers he'd apparently landed on. Flowey's grin stretched almost creepily wide, and Luffy frowned again, instincts once again blaring a warning. "Lucky you, you know! You could've landed anywhere else…"
Flowey swayed, and Luffy blinked in confusion, before noticing that the patch of flowers he had landed on was the only one; the rest of the cavern was rough black rock. "I suppose," he said cautiously, before getting to his feet. He clutched at his head as the ground rocked beneath his feet, but it settled soon after.
"You won't be so lucky all the time, though!" Flowey said, looking dismayed as he stood up. "There are some really dangerous types down here."
"Alright then," Luffy said, brushing off his pants and squarely setting his feet. "I hope I don't run into them!"
Flowey stared at him.
Luffy decided he was going to set off on an adventure, and firmly began to march further into the cavern. If there were things like talking flowers just at the start of the cave, who knew what else he would find further inside?