The first thing he did was press his thumbs into Itachi's palm, and then he started working his way out with a massage.
"You're old..." Shisui tugged each of Itachi's fingers. "Don't worry, I'll wash it out once I get in the room. Um," Itachi's hand was distracting. It was long, with slim fingers. Different from his square hand with fingers as long as his palm. They had similar callouses, though.
It took him more than a few seconds to remember his train of thought. "I just wanted to see if it made any difference at all with the genjutsu. It didn't."