[It's not really how Chuck ends up saying it, but what he's saying that makes his lips part, his eyes widen just a little. He knew that Chuck had a bit of trouble looking at him so exposed, but not to the point of staring.

He closes his mouth, sighs through his nose, shoulders rising and falling to a relaxed slump. He smiles, a little flustered, looking down and then peeking at Chuck.] I wouldn't mind if you stared. I mean, I stare a lot at you even with clothes.

[A quirk of his lips] You have really distracting freckles everywhere.