The is a clear change in his facial expression when she offers to wait. The thought of not being with her in that manner tonight is actually a little distressing to him.

"I would like to," he tells her. "Although you may have to be somewhat... patient with me. It is a lot to assimilate..."

He is stroking her cheek now, softly, carefully. He traces down the side of her face to her lips, and stops. The skin on her lips is so much softer than the rest of her face... and warmer. He knew that would be true, of course-- it is true for humans in general-- but the realization did not make any difference before. He likes touching her cheek, but at the moment he is rather more enamored with the feeling of her lips. He traces them gently with his index finger, then adjusts to do so again with his thumb, so that his other fingers can rest underneath her jawline.