Sanzo the Thief?
It started, oddly enough, with Hakkai's pillow. One night when Hakkai had once more won the most comfortable bed in the room, his pillow vanished in the middle of the night, leaving his head to rest directly upon the bed with no support. The following morning, Hakkai discovered where his pillow had gone. It was underneath a soundly sleeping head topped with blond hair. Being Hakkai, and therefore the most sensible of Sanzo's 'followers', he chose to say nothing, but did remark that Sanzo appeared to be well rested, who he that was and cast a puzzled look in Hakkai's direction when the man rubbed his stiff neck and winced.
A few nights later, Gojyo lost his lighter. He hunted through his pack twice before morosely declaring it lost and taking his aggression out on Goku's arm. The monkey was howling in indignation when Sanzo walked into their bedroom, lit a cigarette and tossed Gojyo his missing lighter.