Sebastian stretches his hand, feeling the tug of the new skin and seems pleased enough by it that he slowly starts bring himself down from a fight or flight mode.

"If I said yes, would you be even remotely surprised?" His voice is calm, even, without even a hint of a tremor, and suggests that he's had plenty of experience sounding like he's in control when he'd really rather lose control and flee. "Just let me contact Malfoy, to wave him off, and check on my dog. Then, if you wish it, I'll be gone."