The reply does have him realizing that maybe he jumped the gun there a little, whoops. Still, he doesn't react with any embarrassment or any remorse as a matter of fact, simply sitting back and nodding.

"Sorry about that."

There's a sort of expectancy in his pose, leaning on one arm, letting the drawing pad sort of hang out in his lap entirely forgotten. Sorry Bucky, he's assuming (again) that you're OK with another attempt. At least this time, he'll be sure.

"Let me know when you're ready."