Rukia and Jushiro
He is always watchin her. You gotta have a thing to keep an eye on a girl that much. Not just because someone asked you to, he does it even when he doesn't need to.. watching her train with Orihime - only cause he wanted to see some women go at it. He also was the one who told Ichigo he was honored that someone would go to such lengths to save Rukia.
Cause he is hittin' it.