[He's pretty sure his own gaze is a little wobbly despite himself (with those big wide blue eyes and all) but. It's having Shiro right there smiling at him like this that in the end just reinforces the thought. There's really nothing that could make him happier than you.]
I'm... [The words are soft, murmured, a little helpless.] Every time, it's like I can't possibly be more in love with you.