Probably because up until now she'd been too flustered and shy to commit to something as intimate as this. Maybe it was something about the day they spent on that island, or she was just feeling particularly bold, but she wasn't nearly done with him.

"Nngh, keep doing that, Natsu..say my name like that," she purred softly, "I love hearing you like that." Knowing she was making him sound like that. She'd never get enough of it. After a moment, her voice was at his ear, nipping gently once before she said softly, "I want to hear you even more." She pressed a kiss to the corner of his mouth, and soon after he'd feel her lips following the trail her hands left, getting ever closer to his length as her hand worked him over.