Given the choice he'd rather not do things this way, but it's less of a risk.  It's one thing for her to indulge here and now, in the privacy of his ship, the helpless span from here to Bespin, but he doesn't imagine that's anything like a commitment. Aside from the fact that they're in the midst of a war, he doesn't imagine he's the sort of man she'd choose in the long run.  That doesn't mean this is meaningless (it isn't, at least for him), or that she doesn't care for him (she does, he can tell), but it's still not a solid foundation for that. 

At least the consideration he's trying to show has kept her from running off, or throwing him out. Actually, this is nice too, in its way, and he relaxes against her, tipping his head to the side with a soft sigh, curling his fingers around her shoulder. The interruption has cooled him off a bit, but he's still close, and there's no question it's better having a hand (...hah) with things than doing it on your own. 

He runs his fingers through her hair, chuckling softly as they tangle near her shoulder.  Okay, okay.  This isn't what he had in mind at all, but it could have gone much worse.