[ It's not so much doubt as it is an uncertainty on what to do next. Not that he doesn't actually know what to do, obviously he does, but this is still something entirely new, a discovery of sorts, and though he's comfortable with Natasha, this is still all just a hint scary. But he tries not to focus too much on that.
There's a pause before he moves again, though, looking her over while she stretches on the bed, then, propping himself on one elbow, he returns his lips to her skin. He shifts on the mattress too, moving lower to kiss a path down to her breasts, breath ghosting a nipple before his tongue darts out to lick it tentatively. At the same time, his free hand slides down her side, draws lines across her navel before settling on the button of her jeans. ]
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There's a pause before he moves again, though, looking her over while she stretches on the bed, then, propping himself on one elbow, he returns his lips to her skin. He shifts on the mattress too, moving lower to kiss a path down to her breasts, breath ghosting a nipple before his tongue darts out to lick it tentatively. At the same time, his free hand slides down her side, draws lines across her navel before settling on the button of her jeans. ]