Greed's really fascinated by this new part. He can't believe that they would do something to him. He's never seen Ed naked, really, before this. So he doesn't know what's there. But this definitely doesn't look right. He moves his finger over it, up and down. He's trying to figure out what to do next. What won't Ed get really angry about? He's not really sure.

"Heh. Good. Wouldn't want you getting too messed up." He moves in a bit closer, and begins to lightly lick the slit where his finger just was. Slowly going up and down it to see what he can get away with. He doesn't push anything... but he does often do it without asking first.