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Another battlefield, another defeat, another day that was ending with Katakuri on the ground, beaten and bloody and feeling more alive than he had in decades. The bitterness about his constant losses at Strawhat's hand faded quickly; Katakuri had never known failure, had never known the freedom of not being perfect and untouchable or the pleasure that comes with pain.
Or that comes with a tiny powerhouse straddling him, also bloodied and grinning and completely focused on getting Katakuri's hand into his shorts. Strawhat smelled like blood and burnt rubber and mochi and Katakuri just wanted to dig his teeth into that bare shoulder or thumb across the faint scars under his pecs. Unlike most of his partners, Strawhat was even willing, but. . .
"You know that I'm your brother, right?" Katakuri thought it was a reasonable question, Strawhat was still young when Revolutionary Dragon came and took him away from Whole Cake Island, but Starwhat paused in trying to get out of his shorts and looked at him like he was the biggest idiot in the world.
"Don't be stupid," Strawhat— Luffy snapped, as blunt as ever. "You were always my favorite."
Cute, but. "Liar." Katakuri remembered Luffy going to Chiffon after nightmares and begging Brûlée for special treats and using Praline as a jungle gym whenever she was home—
"My favorite brother." Ah. That might actually be true, though there had also been a phase where Luffy followed Perospero everywhere. Katakuri didn't think that was important to point out though, not when he had one hand wrapped entirely around Luffy's waist and the other finally getting between his thighs, his fingers already slick.
Katakuri wanted to press his face between his baby brother's legs, bury his tongue as deep as possible until Luffy was screaming, but he settled for dragging his teeth and tongue against Luffy's throat instead.
"You haven't changed a bit," Katakuri murmured into Luffy's skin, chasing the taste of blood and rubber.
"I grew up," Luffy informed him matter-of-factly, now fumbling at Katakuri's own pants. "Your belt is dumb and you should get rid of it."
"Mama says the same thing."
"Oh." Luffy paused his fumbling to think about that, his nose wrinkling like it always did whenever one of their siblings was teasing him about things he didn't understand. Katakuri wanted to kiss it. "Then I guess it's okay."
Katakuri broke into shocked, roaring laughter, hunched over Luffy who was looking at him like he was crazy. His laughter faded into chuckles and he buried his face in Luffy's neck again to hide his tears.
"Mama wants you back home." We miss you. I miss you. You brought joy and laughter and sunshine to our bleak world and everything was just a bit dimmer with you gone.
"Mama can fuck off." Come with me. Run away from mama and join my crew. Be mine again.
They both knew it couldn't happen. Luffy wasn't coming back to Whole Cake Island with him and Katakuri couldn't follow Luffy back to his crew and the seas that were so much more open to the Strawhats than they would ever be for him.
But in this moment, still hard in his too-tight pants and his fingers now working on bullying their way into his little brother, it was nice to pretend.