Even if he wasn't moving her, she was squirming on his lap enough for the both of them. Helpless under the attack, she tugged his hair, rocking forward slightly with helpless, mewling moans and cries, alternating her position from closing the space between them with her arms wrapping around his neck, her head pressing against his, to leaning back which happened to give him more room to work with. But there was no silencing her, no matter how hard she tried. Every time she thought she found some way to quiet herself, Natsu effectively wrecked it with /some/ part of his assault, being it that growl or a touch of his hands, lips, tongue and teeth involved.