She can be excited and nervous at the same time! It doesn't mean he's going to stop; he doesn't want to, she doesn't want to. He wants to climb to his feet and kiss her in reassurance, but he also has a plan, so he resists the temptation.

Besides, she's standing right in front of him nearly naked. That's plenty enough temptation. He leans in and kisses the bare skin of her leg, right above where his hand is.

"With my hands." He slides his fingers down and kisses her again, only a little higher. In all honesty, Cassian is feeling a little nervous himself, but the way he deals with that best is trudging onward. He's more concerned with her comfort. "And maybe my mouth. Is that all right?"