She just wanted him as close as he could possibly get, her chest pressed against his, her arms around him in a lingering embrace. As far as not wanting to waste treasure through the passion between them, well from the deep moans coming from her lips she was on the same wavelength as he, "..oh Natsu~..!" Is about the last thing she manages to get out before feeling his mouth against hers. She leaned into the kiss, her throaty moans and cries barely muffled against his mouth. Of course with that she can't cry out his name in passion unless she pulled away, but she didn't want to. She'd just convey it with the volume, frequency or length of the moans into his mouth instead.