[ Worry mixed with excitement is probably a pretty accurate response to that, yes. Her face remains fairly calm, but in her eyes there's a spark of something possessive and certain, not quite able to be shuttered away.
She's listening to the noises he makes carefully, feeling the twitching of his muscles and using it as a road map to continue making sure she's keeping him just off balance, not quite sure of what she'll do next. Every time any variant of touching settles into a pattern - lips following muscles down, circling the reactor, fingers brushing over thighs - she moves on to something else. Something new, if possible, nipping at pulse points, dragging a hand firmly up his leg, kissing her way up his thighs and stopping just short. She's just going to keep going like this until she gets some sort of more visible reaction. ]
i dooooo
She's listening to the noises he makes carefully, feeling the twitching of his muscles and using it as a road map to continue making sure she's keeping him just off balance, not quite sure of what she'll do next. Every time any variant of touching settles into a pattern - lips following muscles down, circling the reactor, fingers brushing over thighs - she moves on to something else. Something new, if possible, nipping at pulse points, dragging a hand firmly up his leg, kissing her way up his thighs and stopping just short. She's just going to keep going like this until she gets some sort of more visible reaction. ]