He’s surprised he has to say it. That’s the truth about him, he says lots of horrible things all the time, that’s because he assumes all the other stuff is taken for granted and it’s only in that moment Clara realises just how much he’s assuming is taken for granted, absolute monomaniacal devotion to her. He absolutely loves her. – Steven Moffat
Heavily inspired by a panel from &, a manga by Okazaki Mari. Done with Wacom Intuos and Photoshop CS6.