"You're doing really well with all this stuff," he told her, glad that she was adjusting well. He hopped into the driver's side of the car and started it up, taking a second to take in a very subtle deep breath. After finally acknowledging what he was feeling he was a little nervous, but the deep breath helped him hide it.
He turned to get a better view while backing out, still talking as he did so. "I'm sure the spells will be fine. I've got absolute confidence in you." He tossed her a little smile before putting the car in drive and heading on out.
He knew exactly how he was going to do this. After the spells were done, he would suggest that while they were out, he wanted to show her a movie. And then, after that, he would suggest that since it was around dinner time, that they should get dinner. It was going to be a casual thing, something he could easily play off as just a friendly outing if she turned him down when he did finally get up the courage to say something...which, knowing him, wouldn't be until somewhere around dropping her off afterwards.