Lee offers a nervous, uncontrolled smile immediately, then tries to rein it in unsuccessfully. Well. She helps remove Michael's shirt, pulling it over his head and letting it fall on the floor, out of the way. It makes her nervous, looking at him makes her more nervous, but, no, she can't actually stop this now.
She puts her hand back on him, palm flat on his side, just under his ribs. When she kisses him again her hand moves, just her fingers really, curling and uncurling while she strokes him there, marveling in the feeling of bare skin like she's never touched it before. She's really scared, but fear has seldom actually stopped her before - she's always doing things she's afraid of.