His response made her smile, but Su's answer was only to press her lips to his again in a slow, sweet kiss. Perhaps their brains were on very similar tracks, because her thoughts were a lot like his. She wanted more, yes, but she was in no rush to get to that point. This slowness was more than just nice, not just because it was something she hadn't had in awhile, but because it was what she wanted, with him. 'Fast' had been what she'd wanted- needed- with people in the last couple years, but with Kevin she wanted more than that.
And she was perfectly content to just lay here, snogging him under the blankets and enjoying their shared warmth until they finally managed to get up. (After which, yes, she thought it might be nice to try this kissing thing in a few other places, too. And not at all for experimental purposes, simply because she wanted to.)
So instead of pushing this into something more, she just focused on the feeling of his lips against hers, the way his hair felt as she brushed her fingers through it, and how comfortable it was to slip her leg over his just enough to tangle them, but not enough to pull herself any further on top of him.