WARNING: hints of one-sided Sadi-chanxRobin... sort of (?)
Luffy ran down the steaming corridor, his surroundings taking on a sharp, blurry look because of the heat. He slapped a hand down on his hat to keep it in place as he leapt over another clump of guards trying to poke him with their pitchforks. He didn't stop to think where everyone else had gone. None of that mattered at the moment. He had to save h-
Oh.
Luffy was suddenly yanked down from mid-air by a network of arms, slamming him down to the stone floor. He momentarily struggled against the hands constraining him and gripping his throat until he realized who the hands belonged to.
"Mmmmmm! Strawhat Luffy!" A tall woman in a barely-concealing leather outfit stood on a bridge above him. "Magellan was wrong. It wasn't so hard to catch you."
Luffy ignored Sadi-chan. His eyes stared in disbelief at the other figure standing beside her.
"R-Robin!" Luffy stopped struggling. His face lit up and he smiled. "You're alive! We all thought that they had- when you- so- so we came here to save you! All of us! Well, Usopp, Nami, and Chopper stayed behind to guard the ship but Zoro and Sanji-"
"Shut up!" Sadi-chan ordered. "You're getting on my nerves. Nico Robin no longer belongs to you. She's mine, now, mmmm~."
Luffy's grin faded away as he got a better look at the woman they had failed to save from Enies Lobby. At first, he thought she was wearing some sort of red body suit until he realized, to his horror, that she was covered in dried blood and various wounds. Robin's blue eyes were glassy and her expression was blank, much more blank than it had ever been before. It was as if she were dead...
"ROBIN!" Luffy shouted. He began struggling again. "What the hell did you do to her?"
"Oh, she was quite stubborn at first." Sadi-chan stroked the chain she held in one hand, which lead to a leather collar around Robin's neck that matched Sadi-chan's outfit dead-on. "But it just took a few days of torture to break her. It was quite fun. Mmmmm. Quite delicious, indeed. Now she's my newest Demon Guard. Doesn't it fit, mmm, for the Demon Child of Ohara?"
Luffy tried to stretch his arms but Robin's limbs had pinned him down to the point he could barely breathe. "Robin! We're still nakama! Answer me!"
"She can't hear you!" Sadi-chan snapped. She pulled the chain and Robin stumbled closer to her. Sadi-chan smirked at Luffy and licked a trail of blood off of the side of Robin's face as if to prove her point. Robin didn't so much as twitch.
"WHAT DID YOU DO?" Luffy roared, straining against the arms.
"You ought to be thankful!" Sadi-chan wrapped an arm around Robin's waist possessively. "If it weren't for me, she would be dead right now."
"Let her go!" Luffy hollered as more arms appeared to hold him down more securely. "I'd bet she'd rather be dead than serving you!"
"Ha! Mmmmmm, I just love watching Nico-chan break the prisoners! Their screams of pain... mmmmmm!~" Sadi-chan moaned, ignoring Luffy. The chain in her hand clinked.
"Robin! ROBIIIIN!" Luffy screamed as the arms slowly crushed him against the ground, constricting his throat and suffocating him. Sadi-chan looked down at the mass of arms that had captured their target with satisfaction.
"Now let's go find the other pirates, shall we?" Sadi-chan whispered, stroking Robin's blood-encrusted hair. She tugged on the chain and Robin meekly followed her down the hall.
One down. Five left to go.