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Luffy always clung to him for an extra moment as Zoro slipped out of bed for his turn on watch, nuzzling him and holding him tight, half-conscious. Zoro always kissed him and left him alone.
Luffy knew it was important to keep watch, but he always missed Zoro's warm bulk next to him. He rolled over in bed, into the lingering warmth of his spot, pulling the covers tighter and snuggling his pillow.
A moment later Sanji replaced Zoro in bed, while Zoro replaced him in the crow's nest.
"Room for one more?"
Luffy pulled him tight, and cuddled up.