As a general rule, Heiji liked it when he got Snake to crack a smile. Or when he got any reaction out of Snake that wasn't cool indifference -- it didn't seem to matter what it was. Seeing Snake smile that warmly, though... it was nice. Maybe even nicer than annoying him.

Though Heiji played it off with his usual friendly tone, his face felt strangely warm. "Ki ni shinai, ki ni shinai! As long as it keeps ya from getting too bored. Just take care of yourself, okay?"